Perrinia squamicarinata: Shell elevated-conical, with slightly convex sides, yellowish grey, with dark brown spots at the upper part of whorls and below the periphery; whorls 6,5 , slightly convex, with a prominent keel, narrowly perforate. Nucleus rather smooth, blunt, followed by a whorl which is simply costate, the other whorls have 3 spiral lirae, crossed by ribs, which form blunt spines on the upper spiral, round beads on the median one and compressed, spinelike squamae on the third spiral or peripheral keel; on the last whorl these ribs become lamellose and double, each rib consisting of about 2 lamellae, sutures deeply channelled. Base convex, with 5 beaded spirals and lamellose ribs. Moreover the whole shell is covered with microscopic growth-striae. Umbilicus narrow, partly covered by the columellar margin. Aperture subquadrangularly rounded, outer and basal margins rounded in outline, thin, thickened interiorly, with 10 spiral lirae; columellar margin cylindrical, only slightly curved, with a rather strong transverse fold, its base running without angle in the basal margin, slightly expanded over the umbilicus, its upper part, connected by a thin layer, with the outer margin. Alt.6,25 , diam. Maj 4,75; apert. alt. 2,5 mm, lat. 2,5 mm

The main features of this species are:
♦ height usually about 9.2 mm, up to 6.5 mm, width usually about 4.2 mm, up to 5.2 mm;
♦ spire elevated, conical;
♦ protoconch glossy, very weakly convex (almost flat);
♦ teleoconch of up to 6.5 almost flat to weakly convex whorls; 3 granular spiral cords fully visible and a fourth usually partially covered by suture on the penultimate whorl; 4 cords on the last whorl;
♦ first whorl with prosocline threads, distance between threads about 2x width of threads; P2 and P3 at end of whorl, very thin; P1 at second whorl; on third whorl, threads thickening into ribs; spiral cords stronger, similar in size, beads at intersection of cords and ribs; on next whorls, P3 the strongest with pointed beads, P2 the weakest; P4 partially emerging from suture, visible on last whorl, peripheral, weaker than P2; on last whorl, pointed beads of P3 sharp and scaly;
♦ columella with a small basal tooth;
♦ aperture subelliptical; outer lip thickened inside, with about 8 inner folds;
♦ base moderately convex, with 5 granular spiral cords; distance between cords greater than size of cords; axial thin threads between cords;
♦ narrow umbilicus restricted to a slit or even closed by columellar callus;
♦ nacreous white with pinkish flames on the whorls and brownish spots on the cords.

The single record here reported from Solomon Islands, with a single dead adult sample, extends the distribution of this species to the Solomon Islands. Regarding the Philippine samples, the only different feature is the number of spiral cords on the base (4 instead of 5).

Perrinia squamicarinata: Closely allied to C. elisa Gkl. which is however imperforate, without brown markings and has not the conspicuous spinous keel of the new species. In colour it should resemble C. maculata Brazier, which has however four spiral lirae and is imperforate.

Perrinia squamicarinata: Indonesia

Distribution. Philippines, 50-199 m, lv at 80-100 m; Indonesia, East Java, 90 m (using data of Schepman, 1908); Solomon Islands, 105-128 m (dd).