A small species of Nucula, which is relatively common in shallow water off the Antarctic Peninsula, cannot be separated from what the writer (Dell, 1964) considered to be Nucula falklandica Preston. The shells are of comparable size (length 3.2 mm, height 3.2 mm) with moderate inflation. The antarctic shells have a short, markedly convex anterior margin, narrowly rounded anterior and evenly curved ventral margins, and a posterior outline that is almost straight with a slight median sinuation. The exterior is sculptured with sparse, well marked growth wrinkles and relatively strong radial costae that are most pronounced towards the anterior and posterior margins. The periostracum is fairly thick and brownish, covered by a thick ferrugineous deposit especially developed on the anterior margin, but often extending over the beaks and posterior. The hinge is moderately wide, bearing 7-9 anterior and 5 posterior teeth, separated by a strong, oblique, fairly short chondrophore running parallel to the anterior hinge line. The interior of the shell is sculptured with fine subsurface radials and the ventral margin is finely crcnulate. Figures are given of the exterior and interior of a specimen from the Antarctic Peninsula. In all characters the antarctic shells match specimens from off the Falkland Islands. The specimen from off the South Orkneys recorded as Nucula miniuscula by Melvill and Standen (1907) proves to be conspecific.

Falkland Islands, South Orkneys and the Antarctic Peninsula in 6-150 m.