14 Mr. E. A. Smith on Mollusca from the 
Singapore (Reeve) ; Mergui Archipelago (Marfens) ; Port 
Denison, Queensland (Venison- Woods); Port Canning, 
Bengal (ZH. F. Blanford, in Brit. Mus.) ; Station 172, off 
Trincomalee, in 200-850 fathoms (‘Jnvestigator ’). 
Only two or three young specimens, ¢ inch long, were 
obtained at the above station. At this age they are very flat, 
being not more than 6 millim. in diameter. 
Cryptodon acuticarinatus. (PI. II. figs. 7, 7 a.) 
Testa inequilateralis, squivalvis, mediocriter ventricosa, tenuis, 
alba, prope marginem externam epidermide tenui lutescente in- 
duta, concentrice tenuiter striata; valve tenues, postice acute 
bicarinatee, inter carinas profunde sulcate; margo dorsi utrinque 
declivis, anterior longior, vix arcuatus; latus anticum rotun- 
datum, posticum sinuatum ; margo inferior late curvatus ; um- 
bones subacuti, antice versi, pone medium siti; lunula elongato- 
cordata, haud profunda, area dorsalis postica angusta, utrinque 
acuminata, carinis acutis marginata; pagina interna alba, radia- 
tim substriata ; cicatrices et linea pallii indistincte. 
Longit. 17 millim., alt. 14, diam. 103. 
Hab. Station 173, lat. 8° 35’ 45" N., long. 81° 17! 48" E.; 
off Trincomalee, Cey lon, in 609 fathoms, 
In addition to the feeble depression which defines the 
lunule, there is in each valve a second taint impression curving 
from the umbo to the anterior end. Viewed from behind the 
shell has a very acutely carinate and deeply sulcate appear- 
ance, 
Modiola Watsoni, Smith. 
Modiola Watsont, Smith, Lamellibranchiata ‘ Challenger’ Exp. p. 275, 
pl. xvi. figs. 5- Be. 
Modivla, sp., Wood-Mason and Alcock, Ann. & Mag. Nat. Hist. 1891, 
vol. vii. p. 19. 
Hab. Off Luzon, Philippines, in 700 fathoms, and near 
Arrou Islands, in 800 fathoms (‘Challenger ’ ); Station 144, 
Hat.,.to° 5 6”, N.. lone. 72> aaiaG he aml vo fathoms ; 
Station 133, lat. 15° 43° 30” N. , long. 81° 19’ 30” E., in 678 
fathoms. 
Messrs. Wood-Mason and Alcock remark that this species 
is “ an almost characteristic inhabitant of the mud of the Bay 
of Bengal, as at present explored, in and near 100 fathoms.” 
“The byssus is a large bunch of fine silky threads saturated 
with fine mud usually. Met with in beds in thick mud in 
89 to 93 fathoms, and on sand in 98 to 102 fathoms.” 
Some of the Indian-Ocean specimens are of a darker greyer 
