134 Mr. Thomas Thomson on a [Feb. 



The last shell was marked by Mr. Sowerby as a new 

 species of Buccinum. Although approaching B. undatum, 

 it may be distinguished by the following characters : — 



1. Buccinum striatum. 



B. Anfractibus longitudinaliter undatis, transversim striatis, 

 parum convexis, costis longitudinalibus fere rectis. 



This buccinum approaches nearly to B. undatum, from 

 which, however, it is easily distinguishable by several 

 particulars. 



If B. undatum be examined with a microscope, it will be 

 found that the transverse ridges are elevated, broad and 

 distant, and there is between each of these ridges, in the 

 upper whorls, a narrower and less elevated ridge, and in 

 the lower or newer part of the shell, generally about three. 

 Now, in B. striatum, the ridges are so flat that the shell 

 may much more properly be said to be spirally striated, 

 than covered with transverse ridges. The whorls in the 

 new shell are also much flatter than in B. undatum, and the 

 longitudinal undations which in that shell are considerably 

 concave towards the mouth of the shell, are here almost 

 quite strait. F. lamellosus possesses the following cha- 

 racters : 



2. Fusus lamellosus. 



F. oblongus, longitudinaliter costatus, parte superiore an- 

 fractuum subangulato ; anfractibus 10 costatis, costis 

 elevatis ad aperturam testae, concavis, supra subspi- 

 nosis ; apertura ovali, cauda breviori quam apertura, 

 late canaliculata, parum reflexa. 

 This pretty little fusus is about 5 lines in length, and 2£ 

 in breadth, being more minute than recent specimens. Each 

 whorl is furnished with ten longitudinal ribs, and the inter- 

 stices are perfectly smooth. The ribs are considerably 

 elevated and acute, and are rather prominent on the upper 

 part of the whorl, which is slightly angled. There they 

 rise so as to form small teeth, beyond which they are con- 

 tinued obliquely along the flat part of the whorl, quite to 

 the suture. The canal is open, and rather wide, but not so 



the Cemoria Flemingii of Leach in the British Museum, and has ascertained their 

 identity. The Fusus lamellosus, is the Murex lamellosus of Lamark, and a 

 remarkable circumstance connected with the history of this shell is, that hitherto 

 it has only been found in the South Sea, at the Falkland Islands, with a specimen 

 from which locality I have been favoured by Mr. Sowerby. — Edit. 



