418 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Pecten and other shells, we often met with the various species of Odos- 

 tomia, among which 0. seminuda (Plate XXIY, fig. 148,) was much the 

 most common; but 0. producta, (Plate XXIV, fig. 143,) 0. impressa, 

 (Plate XXIY, fig. 147,) and 0. trijida, (Plate XXIV, fig. 145,) occurred 

 in shallow water; and also Turbonilla elegans, (Plate XXIV, fig. 155,) 

 which is a very handsome, glossy, brown shell ; and T. interrupta, which is 

 a similar shell, but more slender, with less convex whorls. The PJulima 

 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, Tlvyone 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 8. multistriata, (Plate XXI, 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 XXIX, 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 Scapliarca 

 transversa, (Plate XXX, fig. 228,) Clidiophora trilineata, (Plate XXVII, 

 fig. 193,) Nucula proxima, (Plate XXX, fig. 230,) Mytilus edulis, (Plate 

 XXXI, fig. 234,) Modiola modiolus, (Plate XXXI, fig. 237,) Grenella 

 glandula, (Plate XXXI, fig. 233.) Pecten irradians, (Plate XXXII, fig. 

 243,) Anomia glabra, (Plate XXXII, figs. 241, 242.) The Modiolaria 

 nigra (Plate XXXI, 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. The same is true of 

 Corbula contracta, (Plate XXVII, fig. 191,) which was perhaps a little more 

 commonly found living than the last. The Cyclas dentata (Plate XXIX) 

 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- 

 curred. The same remarks will apply to Coclodesma Leanum, (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 Cyelocardia 

 borealis (Plate XXIX, fig. 216) and C. Novanglice (Plate XXIX, fig. 215) 

 were quite common in the deeper waters. 



The Gastranella tumida V., (Plate XXVII, fig. 190) is a small and 

 rare shell, recently discovered, and has, as yet, been found only on a 

 shelly bottom among hydroids, near Xew Haven, in 4 or 5 fathoms. 

 The Angulus modestatus V. (Plate XXX, fig. 224) is a species recently 



