Mr. Jeffreys on British Mollusca* 117 



The spire is shorter, the volutions are more swollen, and the transverse 

 striae on the last whorl are coarser than in the typical or ordinary 

 form. 



Mangelia Trevilliana, iii. 452. In dredged sand from Belfast 

 Bay. 



M. purpurea, iii. 465 ; var. alba. Zetland. 



M. cancellata. In a living specimen, which was procured by 

 Mr. Barlee in Zetland, the tip of each nodule or point of junction 

 of the ribs is delicately tinged with pink. 



M. reticulata. Pleurotoma reticulatum (Bronn), Phil. i. 196 a'nd 

 ii. 165. A specimen of this lovely shell was taken in the Shetlands ; 

 and it agrees exactly with the specimen from Guernsey, which I 

 noticed in the 'Annals' for August last (vol. ii. no. 8. p. 131) under 

 the name of M. cancellata. That species, however, differs from this 

 in its more slender shape, and in not being turriculate, as well as in 

 the longitudinal ribs not extending to the suture of each whorl, but 

 leaving an interstice, which is only marked by the transverse striae. 

 The largest of my specimens does not measure half an inch in 

 length ; but some from the Mediterranean attain nearly double that 

 size. 



M. elegans, iii. 473. Mr. Barlee procured, in his Zetland dredg- 

 ings, a specimen of this shell. It has been hitherto considered to be 

 a Southern species. 



M. Ginnanniana. PI. Ginnannianuniy Phil. i. 198 (Bertrandi) 

 and ii. 168. M. nebula, var. pi/ramidata, B. M. iii. 478. This 

 appears to be a distinct species, as well as M. Icevigata {PI. Iceviga- 

 tum, Phil.). It differs from M. nebula in being less slender, in the 

 peculiar mode of its coloration, and in the transverse striae being 

 much finer and more close- set. It is also of a larger size, one of my 

 specimens measuring nearly five-sixths of an inch in length. Mr. 

 Barlee has taken it off the Arran Isles, county Galway, and in Zet- 

 land ; and Mr. Clark has found it at Exmouth, together with M. ne- 

 bula and M. Icevigata. It is most probably the M. nebula of Lovdn, 

 which he says differs from the English form in the above particulars. 



M. brachystoma, iii. 480. Weymouth {Mr. Thompson). 



M. striolata, iii. 483. Falmouth and Oban {Rev. Mr. Norman). 



Gasteropoda Opisthobranchiata. 



Bulla cornea, Lam. vi. (2.) p. 36. Specimens of the true B. hy- 

 datis, or what is usually called the Mediterranean species (though 

 both equally inhabit that sea), were found at Guernsey, many years 

 ago, by Mr. Lukis ; and I also found the B. cornea at Serk by 

 dredging. There can therefore be no doubt as to the propriety of 

 thus distinguishing the two species, as suggested by the authors of 

 the 'British Mollusca/ The shell of B. hydatis is narrower and 

 more solid, and it has the crown or apex rather deeply umbilicated. 

 It appears to be the Hamincea elegans of Leach's * Synopsis of the 

 British MoUusca,' p. 42. 



Cvlichna mammillata, iii. 511. Guernsey. 



