24 MARINE INVERTEBRATA OF GRAND MANAN. 



Natica flava, Gould. Taken iu 50 fathoms, mud, some miles off the Swallow's 



Tail. 



N. HERDS, Say. In sheltered muddy bays, about low-water mark ; rarely found. 

 The specimens were all of the northern, short-spired type, and of a very thin 

 structure, with well-developed epidermis. 



N. TRiSERiATA, Say. At Fisher's Cove, in the littoral zone, and in 10 fathoms, 

 off Cheney's Head. 



N. Gronlandica. Beck. Inhabits very deep water in this region. 



N. IMMACULATA, Tott. Rather common on the sands of Fisher's Cove at low 

 water, and more rarely occurring at various depths, to 25 fathoms. 



N. CLAUSA, Brod. et Sow. Taken in 25 fathoms, gravel, off the northern point of 

 Duck Island. 



Velutina haliotoides, Moll. 



V. ZONATA, Gould. Very large specimens of this and the preceding species are 

 taken in the laminarian zone, this inhabiting, however, deeper water than the for- 

 mer, which occasionally occurs at low water. 



Lamellaria perspicua, Loven. Inhabits rocks in the coralline zone. It is 

 rarely taken by the dredge, however, from its preferring the crevices of the ledges 

 to their upper surfaces. 



Admete viridula, St. • Common on shelly bottoms, in the coralline zone. 



Trichotropis borealis, Brod. et Sow. Rarely taken alive, though dead shells are 

 not uncommon in the coralline zone. 



Purpura lapillus, Lam. A large, thick, dark chocolate-colored variety is common. 



Nassa trfv^ittata. Say. This species must be exceedingly rare here, notwith- 

 standing its abundance further south, as only one specimen was found. 



BuGCiNUM UNDATUM, Linu. This species is exceedingly abundant here in the 

 lower levels of the littoral zone. It is seklom found in deep water, though a 

 beautifully sculptured specimen sometimes occurs in the coralline zone. 



Tritonium Islandicum, Loven. Found at all depths from low-water mark to 40 

 fathoms. 



T. ptgMjEUM, St. Found on muddy and sandy bottoms, at various dei^ths. 



T. DECEMCOSTATUM, Midd. Comuiou at low-water mark, and at various depths 

 to 40 fathoms. 



T. CLATHRATUM, Miill. On a patch of shelly bottom, about two miles north of 

 Duck Island, this rare species is common as dead shells, but living specimens 

 occurred in only two instances. 



Fasciolaria ligata, Migh. Several of this fine species were taken in 25 fathoms, 

 in the Hake Bay. 



CoLOMBELLA ROSACEA, St. Living Specimens are by no means rare in deep water. 



C. DISSIMILIS, St. This species occurred only once, but then in great numbers, 

 at a haul of the dredge on a sandy spot in 8 fathoms, about two miles north-east of 

 Cheney's Head. 



Mangelia tdrricula, F, et H. In twenty-five f., in the Hake Bay. 



M. pyramidalis, St. The specimens from this region are mostly shorter and 

 broader than usual. Taken occasionally at low water. 



