18 Mollusca from Bay of Bengal and Arabian Sea. 
M. angulata, Sowerby *, another Indian-Ocean species, is 
well distinguished from the present form by its different and 
remarkable shape. It was dredged in the Bay of Bengal at 
a depth of 200 fathoms. 
Amussium caducum, Smith. 
Amussium caducum, Smith, Ann. & Mag. Nat. Hist. 1894, vol. xiv. 
p. 1738. 
Hab. Station 185, lat. 15° 29! N., long. 72° 41' E.; off 
Goa, west coast of India, in 559 fathoms. 
This species has now been obtained on both sides of the 
Indian peninsula, and also in the China Sea, at depths 
ranging from 410 to 700 fathoms. 
Lima (Limatula) subtilis. (Pl. IL. figs. 13, 13 a.) 
Testa eequivalvis, convexa, tenuissima, ovata, inferne lateraliter 
subacuminata, pellucido-albida, liris tenuissimisradiantibus circiter 
24, medianis lateralibus confertioribus, lineisque incrementi supra 
liras minute squamosis subcancellata; umbones acuminati, sub- 
approximati; linea cardinis tenuis; area ligamenti fusiformis, 
angusta; pagina interna radiatim sulcata, sulcis liris externis 
convenientibus; margines valvarum ad extremitates lirarum 
minute dentati. 
Alt. 10 millim., longit. 6, diam. 53. 
Hab. Station 176, lat. 11° 47! 6" N., long. 73° 57! 30" E.; 
off Malabar coast, in 1070 fathoms. 
This species, of which only a single specimen was ob- 
tained, is extremely thin, and has an oblique appearance, on 
account of the most prominent acute ventral curve being 
somewhat lateral. It is more or less coated with a thin rust- 
red earthy deposit. 
EXPLANATION OF THE PLATES. 
PuatE I. 
Fig. 1. Pontiothauma mirabile. 
Fig. 2. —— abyssicola. 
Fig. 3. Pleurotoma vagata. 
Fig. 4. —— presignis. 
Figs. 5, 5a. Drillia fugata. 
Fig. 6. Nassa turrifera. 
Fig. 7. Columbella (Mitrella) Pacet. 
Fig. 8. Natica albospira, 
Fig. 9. —— candidula. 
* Proc. Zool. Soc. 1888, p. 208, pl. xi. fig. 16. 
