22 NILS HJ. ODHNER, MOLLUSCA. 
has its anterior part somewhat produced towards the front and above; the smaller 
one is more like fig. 108 but with a more obviously indicated angle between the 
hinder and the upper margins. — LyNne@w (1909) includes this form, which has a wide 
distribution in the Indian Ocean, with the American gradata and squamosa, and 
some others. 
Pectunculus holosericus Reeve. 45 miles W. 8. W., 66 feet (°°/s), 1 sp., 1. 
38 mm. The species is easily recognized from the figure and description given by 
tEEVE (fig. 18. Conch. Icon. 1, 1843). It is previously recorded from New South 
Wales (EK. A. SmirH 1885). 
P. vitreus Lamarck (Pl. 1, figs. 12, 13). 45 miles W. S. W., 48 feet (°/7), 1 sp., 
1. 20 mm; 42 miles W. S. W., 72 feet ('*/7), 1 sp., 1. 22. mm. REEVE’s fig. 44 
(Conch. Icon. 1, 1843) seems to present an older specimen; the present specimens 
have dark brownish spots and somewhat broader ribs than the figured one, but in 
other parts they are very like it. Mertvitn & Sranpen report the species from 
Torres Strait (1899). The distribution is otherwise unknown (cf. Lamy 1911). 
In the animal there are to be observed a series of large calcareous concretions 
situated within the nephridia (but seemingly confined to the intestine). Such secre- 
tions are also observed by PELSENEER in P. auriflwus (1911). 
The present specimens correspond in their somewhat sloping and less convex 
anterior and posterior margins better to P. vitreus than to the rather similar P. 
orbicularis ANGAS (Proc. Zool. Soc. 1879, pl. XX XV, fig. 9), which has a more orbic- 
ular outline. 
P. setiger n. sp. (Pl. 1, figs. 14, 15). Shell rounded oblong, with inflated 
umbones, upper margin nearly straight, outline for the rest wellrounded. Sculpture 
consisting of about 35 coarse radiating ribs, transversally divided into tubercles, the 
interstices as broad as the ribs, or broader towards the margins, and bearing 2—3 
radiating rows of cuticular hairs, which are longer towards the anterior margin, 
Colour brownish, marbled with white, forming 2—4 concentric bands on the lower 
and median part of the valves, and large confluent dots towards the umbones; 
ligamental area brown-striped, white-bordered. Dimensions: |. 19, h. 18, thickness 
12 mm. Locality: 48 miles W. S. W., 78 feet (**/:), 1 sp. This species closely 
resembles in colour and sculpture P. cardiiformis ANGAS (Proc. Zool. Soc. 1879, pl. 
XXXV, fig. 6), but differs from it in its dorsal margin and the broader interstices 
between the ribs, as well as in its cuticular hairs. 
Limopsis multistriata ForskAt. 48 miles W. 8. W., 78 feet, 1 sp., 1. 19 mm; 
45 miles W. S. W., 48 feet (8/7), 2 sps, max. l1. 20 mm. The specimens collected 
agree completely with specimens of this species from the Red Sea (in R. M.). — 
Recorded, further, from the Arabian Sea, Singapore, Gulf of Siam, Japan, Torres Strait 
and Port Jackson (Lyne 1909). 
