1885.] 'lightning' AND ' PORCUPINE ' EXPEDITIONS. 49 



tertiary : Siberia, Norway, Bridlington, Lancashire, Cheshire, and 

 Labrador. 



Murex costeUifer, J. Sowerby, Admete crispa, Miiller, and 

 Cancellaria bu.ccinoides, Couthouy. 



Among the varieties are one having the spire produced or elongated, 

 and another which is much larger. The columellar folds are much 

 stronger and more conspicuous in specimens from Spitzbergen and 

 North America, and from the fossil bed at Bridlington. Spire 

 bulbous and intorted. The animal was described by me in the 

 'Annals and Magazine of Natural History ' for April 1877. 



2. Cancellaria mitr.eformis, Brocchi. 



Valuta mitrceformis, Brc. Conch, foss. Subap. ii. p. 6-15, t. xv. 

 f. 13. 



C. pusil/a, H. Ad. in P. Z. S. 1869, p. 274, pi. 19. f. 12. 



'Porcupine' Exp. 1870: Alt. St. 16, 24, 25, 28, 30. 



Distribution. B. Biscay ('Trav.' Exp. 1882), 249 fms. !, Canary L 

 (McAndrew) I 



Fossil. Pliocene : Coralline Crag, Denmark (Morch), Biot, and 

 throughout Itiily. 



This appears to be a variety of Brocchi's species, and may be a 

 somewhat altered descendant. The chief difference between the 

 recent and fossil shell seems to consist in the former having only a 

 few spiral ridges, while the latter is closely striated in the same 

 direction as well as indistinctly reticulated by numerous and slight 

 longitudinal strise. 



Not C. pusilla of Sowerby's ' Conchological Illustrations,' 1841. 



3. Cancellaria minima, Reeve. 



C. minima, Eeeve, Conch. Icon. {Cancellaria), pi. xvii. f. 77, a, b. 



' Porcupine ' Exp. 1870 : Alt. St. 28. P'ive specimens. 



Distribution. Gibraltar and Madeira (McAndrew). 



No habitat is given in Reeve's work, Cuming's collection being the 

 only authority. 



Allied to C. suhangulosa of S. Wood from the Coralline Crag, 

 but differs in the want of angularity, as well as in the stronger and 

 coarser sculpture, especially with respect to the longitudinal ribs ; the 

 sculpture ol the apex is also different, consisting in the recent species 

 of very fine and microscopic spiral lines, and in the fossil shell of 

 minute longitudinal stria?. A variety of C. mininfo, which has the 

 whorls angulated below the suture as in the fossil species, was 

 dredged by McAndrew with the typical form off Madeira and the 

 Canaries ; this has the same sculpture as in the recent species ; and 

 perhaps all these forms may represent one and the same species. In 

 that case Searles Wood's name subangulosa would have priority over 

 that of Reeve. 



4. Cancellaria cancellata, Linne. 

 Volvta cancellata, L. S. N. p. 1191. 



Proc. Zool. Soc— 1885, No. IV. 4 



