Descriptions. — 'Testa ovata, fragilis, subcompressa, apice postico, uncinato; radiatim sulcata, sulcis sublatis, undatis, interruptis; margine dentato; flavescente, punctis nigris circulariter dispositis picta; intus margaritacea. 6x4x3 mm. Santiago (vivant). Fossil: Depots de Santiago (M. de Cessac) Mus. Paris." (cfr. Rochebrune 1881).
Translation: Shell ovate, fragile, not elevated; apex situated posteriorly, hook-shaped; radially furrowed, the furrows being raised, undulating and interrupted; margin denticulated; flavescent, ornamented with black points deposited in circles; interior brilliant.
This species presented by De Rochebrune the 29th oct. 1881 to the Bull. Soc. Philomatique of Paris (printed in 1882, date mentioned by the Zool. Rec, 1886, and by Pilsbry 1900) was also described in the Nouv. Arch, of the MHNP (printed in 1881!). I have never encountered this species in any Museum, not even in Paris where it is cited by Rochebrune. Having seen some specimens mentioned below recently, I am able, as far as it concerns the same species, to give some supplementary notes.
The margin of these specimens is not denticulated as mentioned by Rochebrune. There are no furrows, channels or grooves. The potential ribs covered with points '(round drops or spines), white as the shell, are interrupted in the median part of the shell and before the apex, which is situated at approximately 4/5 of the length. The number of ribs is variable: less than 60 on the drawing of Thiele, 70 on the juvenile from Furna , 90 in the adult of Mindelo. In the last specimen the grains are not well marked and are on rays which are irregular, a little arbitrary, not continued nor aligned. The Gabon specimen has 100 radials, as far as I can count them on my copy of the eroded specimen. In the juvenile there are no radial ribs, only a great number of very fine concentric ridges. The independent drops, or points, are well placed on two fictive lines, namely on radial rows and concentric lines in large ovate form (This is also the case in some P. scobinata). In the adult specimens the sculpture is a litle ribbed, as drawn by Rochebrune and Thiele, and has few drops and points. For this reason I keep this species in the section B, with radial ribs more pronounced.
The proportion B/L given by Rochebrune (4/6 = 0,67) is different from the picture where it is 0,75, same proportion as the juvenile I figure here.

Type & Distribution. — The type has not been encountered in museums nor collections. In case we do, a lectotype should be selected, as Rochebrune mentions recent and fossil specimens. Cape Verde: Santiago (types); Mindelo, Vicente Isl. 4.3 x 3.4 mm, collected by Dr. E. Rolan; Furna, Brava Isl., (here Rolan found a few specimens in sand at 10-30 m depth, with a juvenile measuring 2.8 x 2.1 x 0.8 mm; I see fig. 31, coll. JC); Gabon, Cape Esterias, collection Bernard, 1986, circa 7,5 x 6,5 mm.