PLEUROTOMA. 397 



and comprises Greenland^, Spitzbergen, Iceland, Scandi- 

 navia, Heligoland (Frey and Leuckart), the Boulonnais 

 (Bouchard-Chantereaux), Cherbourg and La Hougue 

 (De Gerville), and the United States (Mighels and 

 Stimpson) ; depths 10-150 f. 



The length of the spire is a very uncertain character. 

 Monstrosities are rare ; I have one in which the mouth 

 and canal are considerably curved. A specimen in my 

 cabinet, from the body-whorl of which a large piece had 

 been at one time taken away, exhibits a peculiar sort of 

 repair : the renewed portion has no trace of longitudinal 

 ribs, although the spiral sculpture is replaced. The 

 largest specimens I have ever seen were dredged in from 

 50 to 60 f. off the Dogger bank on the Yorkshire coast ; 

 they measure three-fourths of an inch in length, and 

 about one-third of an inch in breadth. One from Shet- 

 land is as long, but narrower. 



It is probably the Turbo albus of Pennant, certainly 

 the Murex angulatus of Donovan, and the Fusus turri- 

 cola of Fleming and Forbes; the fry is apparently 

 Adams's Buccinum minutum. Leach also placed it in 

 the genus Buccinum. Through the kindness of Dr. 

 Morch I have compared the types of Holler's Green- 

 landic species with British specimens in my own collec- 

 tion ; and I would refer the Defrancia nobilis, scalaris, 

 and exarata of the last-named author to the present 

 species. Fusus discors, discrepans, and castaneus of 

 Brown may be placed in the same category. The Mu- 

 rex turricula of Brocchi (which is also a Pleurotoma) is 

 very different from ours, and must have another specific 

 name. 



