398 THE CANADIAN NATURALIST. [Vol. vi. 



Bucchnim plectrum, Stimpsou. 



Fossil — Riviere-du-Loup ; rare. 



Recent — Murray Bay ; Portland, Maine, (Stimpson) ; Beli- 

 ring's Straits, (Stimpson) 



This may be a variety of the preceding species, but can be 

 distinguished from it and grows to a larger size. It has the 

 sculpture of B. glaciate with the aperture of B. undulatum. 

 Recent and fossil specimens are quite similar. 



The northern Buccina are involved in so much contusion 

 that I have made them a subject of special study, and have 

 sedulously collected all the forms recent and fossil. I have been 

 very much aided in this by the abundance of specimens of the 

 more Arctic forms at Riviere-du-Loup, and the the occurrence 

 of most of them recent at Murray Bay and Tadousac, and I feel 

 confident that the names given in this list represent forms actually 

 occurring as distinct in nature, though some of them may not 

 be distinct specific types. I believe, however, that B. ciliatum 

 B. glaciale, B. undatiim, B. tenue and B. Groenlandlcum, are 

 probably entitled to this rank. The others appear to me on 

 comparison of large numbers of specimens, to graduate into one 

 or other of the above forms. 



I have given in the engraved plate representatives of the more 

 critical forms, which will enable them to be recognized. 



In the drift the Buccinums often part with their outer coat 

 of prismatic shell, and in this decorticated state are very difl&cult 

 to determine. 



Buccinofusns (^Sipho) Kroyeri, Moller, 



Fossil — Riviere-du-Loup ; Labrador (Packard). 

 Recent — Gulf St. Lawrence and Arctic seas. First recog- 

 nized as this species by Mr. Whiteaves. Specimens from Spitz- 

 bergen in Mr, Mc Andrew's collection are perfectly similar to 

 ours. Packard found it not uncommon at Labrador, but it 

 seems rare in other parts of the Gulf of St. Lawrence. In some 

 previous lists it has appeared as B. cretaceum, Reeve, which 

 seems to be an error. 



Clirysodomus Spitzhergensis, Reeve. 



Fossil — Montreal (small and rare.) 



Recent — Murray Bay to Gaspe ; also Spitzbergen, and probably 

 Sea of Okotsk, 



Only one specimen occurred at Montreal, and was an unknown 



