124 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [418] 
Pecten and other shells, we cften met with the various species of Odos- 
tomia, among which O. seminuda (Plate XXIV, fig. 148,) was much the 
most common; but O. producta, (Plate XXIV, fig. 143,) O. impressa, 
(Plate XXIV, fig. 147,) and O. trifida, (Plate XXIV, fig. 145,) occurred 
in shallow water; and also Turbonilla elegans, (Plate XXIV, fig. 155,) 
whichis avery handsome, glossy, brown shell; and 7. interrupta, which is 
a similar shell, but more slender, with less convex whorls. The Hulima 
oleacea (Plate XXIV, fig. 149) is a very elegant, white, polished, and 
shining shell, and generally rare, but in two instances we found several 
of them adhering to the skin of the large Holothurian, Thyone Briareus, 
upon which it seemed to live as a quasi parasite or “‘ commensal.” 
On shelly and muddy bottoms we occasionally found Scalaria lineata, 
(Plate XXI, fig. 123,) and S. multistriata, (Plate X XI, fig. 122,) both of 
which are rare and elegant shells. The Pleurotoma bicarinatum (Plate 
XXI, fig. 106) occurred rarely. 
The bivalve shells are also quite numerous on these bottoms. Among 
them the Mactra solidissima (p. 358, Plate XXVIII, fig. 203) is most 
conspicuous on account of its great size and frequent occurrence ; its 
dead shells were often very abundantly scattered over the bottom, and 
were generally incrusted with numerous bryozoa and hydroids. The 
Gouldia mactracea (Plate X XIX, figs. 206, 207) was quite common in many 
localities in a living state, while the dead shells were generally diffused. 
Among the other species that are common or abundant are Scapharca 
transversa, (Plate XXX, fig. 228,) Clidiophora trilineata, (Plate XX VII, 
fig. 193,) Nucula proxima, (Plate XXX, fig. 230,) Mytilus edulis, (Plate 
XXXI, fig. 234,) Modiola modiolus, (Plate XX XI, fig. 237,) Crenella 
glandula, (Plate XX XI, fig. 233,) Pecten irradians, (Plate XXXII, fig. 
243,) Anomia glabra, (Plate XXXII, figs. 241, 242.) The Modiolaria 
nigra (Plate XX XI, fig. 236) occurred only in few localities in the deep 
water of the middle of the Sound, associated with the common muscle. 
The Cumingia tellinoides (Plate XXX, fig. 221) was found living occa- 
sionally, but its dead shells were quite common. Whe same is true of 
Corbula contracta, (Plate XX VII, fig. 191,) which was perhaps a little more 
commonly found living than the last. The Cyclas dentata (Plate X XIX) 
fig. 211,) is a handsomely sculptured, pure white shell, which we met 
with only a few times in the living state, though dead valves often oc- 
eurred. The same remarks will apply to Coclodesma Leanuwm, (Plate 
XXVII, fig. 198,) of which the shells were much more common. The 
Kellia planulata (p. 310,) and Montacuta elevata also occasionally occur 
on shelly bottoms, but were seldom obtained alive. The Cyclocardia 
borealis (Plate X XIX, fig. 216) and C. Novanglie (Plate X XIX, fig. 215) 
were quite common in the deeper waters. 
The Gastranella tumida V., (Plate X XVII, fig. 190) is a sinall and 
rare shell, recently discovered, and has, as yet, been found only on a 
shelly bottom among hydroids, near New Haven, in 4 or 5 fathoms. 
The Angulus modestatus V. (Plate XXX, fig. 224) is a species recently 
