144 



Stat. 240. Banda. 9 — 45 M. Black sand, coral, i Spec. 



Stat. 260. Near Nuhu Jaan, Kei-islands. 90 M. Sand, coral and shells, i Spec. 



Stat. 318. 6°36'.5S., I40°55'.5E. Java Sea. 88 M. Fine, yellowish-grey mud. i Spec. 



The specimen from Stat. 260 is very young. 



1 1 . Amphiperas (Radius) philippinaruin Sowerby. 



SowERBY. Proc. Zool. Soc. 1848, p. 136. 



Reeve. Conch. Ic. Vol. XV, Ovulum, fig. 46. 



Weinkauff. Martini-Chemn. Conch. Cab. Ed. II, Vol. V, Ovula, p. 199, PI. 51, fig. 2, 3. 



Tryon. Man. of Conch. Vol. VII, p. 252, PI. 4, fig. 100, i. 



Stat. 273. Pulii Jedan, East coast of Aru-islands. 13 M. Sand and shells. 5 Spec. 



Stat. 310. 8°30'S., 1 19° 7'. 5 E. Flores Sea. 73 M. Sand with few pieces of dead coral, i Spec. 



The specimen from Stat. 310 is still very young and a little doubtful, those from 

 Stat. 273 are fine and adult. I think Tryon has gone too far in uniting so many species to 

 A. philippina7^um, so I have recorded the two next forms as separate species. 



The radula is long, yellowish-brown and consists of a large number of transverse rows 

 of teeth. The rhachidian tooth (R) has a broad sub-quadrangular body with convex upper and 

 basal margin, a long sharp median denticle and 3 smaller ones on each side, the laterals (i) have 

 an elongate body ending in a tail on the distal side and a tricuspid cusp, composed of a very 

 large central denticle and a small one on each side, the uncini have the ordinary comblike 

 structure, the inner one has 15 denticles, of which the majority is simple, only a few of the 

 distal ones and sometimes one or two others are bifid, the denticles of the outermost of the 

 uncini are as a rule bifid, in a few I see three cusps, the number of denticles is about 40, with 

 a knoblike one at the distal extremity. 



12. Amphiperas (RaditisJ Angasi (Adams) Reeve. 



Reeve. Conch. Ic. Vol. XV, Ovulum, fig. 43. 



Weinkauff. Martini-Chemn. Conch. Cab. Ed. II, Vol. V, Ovula, p. 199, PI. 51, fig. 5, 8. 



Tryon. Man. of Conch. Vol. VII, p. 252, PI. 4, fig. 3, 4 [pinlippinarum pars). 



Stat. 164. i°42.S S., I30°47.5 E. Halmahera Sea. 32 M. Sand, small stones and shells, i Spec. 



Stat. 273. Pulu Jedan, East coast of Aru-islands. 13 M. Sand and shells. 4 Spec. 



Stat. 315. East of Sailus Besar, Paternoster-islands. Up to 36 M. Coral and Lithothamnion. i Spec. 



The specimen from Stat. 164 is a dead shell with impressed striae over the whole surface, 

 this may however depend on the circumstance that the shell is slightly worn, as I see traces of 

 these striae in a fresh but young specimen from Stat. 273. The shell is in comparison much narrower 

 than the preceding one, the shape is more elegant, in fresh specimens the tips are slightly rosy. 



The radula resembles in many respects that of the former species. The rhachidian tooth 

 (R) has a sub-quadrangular body, with a long median denticle and two smaller ones at each 

 side; the laterals (i) with their tailed body, have also a long cusp with one smaller denticle 

 on the inner, two very small ones on the outer margin. The uncini are comblike, with usually 

 simple and a few bifid denticles amongst the inner ones and bi- and trifid in the outer ones. 



36 



