Bay of Bengal and the Arabian Sea. 15 
colour than the specimens obtained by the ‘ Challenger,’ and 
the valves are also deeper in proportion to the length. The 
largest specimen is 30 millim. long and 123 in diameter, 
whereas the finest ‘ Challenger’ example is 43 by 134. “ The 
rust-like incrustation adhering to the anterior or umbonal 
region’? noticed in the type is also present in all the Indian- 
Ocean specimens. 
Limopsts indica, Smith. 
Limopsis indica, Smith, Ann, & Mag. Nat. Hist. 1894, vol. xiv. p. 171, 
pl. v. fig. 7. 
Hab. Immediately off Minnikoy Island, Maldive group, in 
1200 fathoms. 
The specimens from the above depth are quite free from 
the ‘ rust-red earthy deposit” which more or less coated the 
typical examples. 
Nucula donaciformis. (PI. II. fig. 8.) 
Testa triangularis, solidiuscula, valde inzquilateralis, antice oblique 
truncata, ad extremitatem subangnlata, postice acuminate rotun- 
data, sub epidermide olivacea, albida, vel plus minus livida, liris 
tenuibus arcuatis dorsum versus utrinque obsoletis, instructa, 
lineis incrementi decussata; area ante umbones sublunulata, in 
medio prominens, impressione haud profunda circumscripta, fere 
levis; area postica vix sculpta, haud limitata, in medio anguste 
excavata; margo dorsi anticus rectiusculus, valde descendens, 
posticus longior, leviter arcuatus ; margo ventris late curvatus ; 
umbones incurvati, antice versi ; pagina interna albo-margaritacea, 
radiatim obsolete striata, margine inferiore pulcherrime denticu- 
lato; dentes anteriores cardinis circiter 11, posteriores 18-20 ; 
fossa ligamenti parva, obliqua. 
Longit. 15 millim., alt. 11, diam. 73. 
Hab. Station 162, lat. 13° 51! 12” N., long. 80° 28! 12" Es 
Bay of Bengal, in 145-25) fathoms. 
The form of this species is very triangular, and the ventral 
margin is unusually straight. It somewhat recalls NV. sulcata, 
Brown, but it is more angular anteriorly, the radiating lines 
are fewer, and the concentric sculpture finer. The denticula- 
tion within the ventral edge of the valves is also coarser than 
in the British species. 
Nucula bengalensis. (Pl. II. fig. 9.) 
Testa acuminate ovata, valde inequilateralis, tenuis, epidermide 
polita olivacea induta, lineis incrementi tenuibus, striisque tenuis- 
