GASTEROPODA. 163 



quently, uncertain ; the sinus in the outer lip resembles that of Pleurotomaria. 

 Mr. Gray has placed it among the Haliotiche. 



1. Scissueella ceispata. Flem. Tab. XV, fig. 13. 



Scissuiiella ckispata. Flem. Hist. Brit. Animals, p. 3G6, 1828. 



— — S. Wood. Catalogue 1842. 



— aspera (?). Phil. En. Moll. Sic. p. 160, t. 25, fig. 17, 1844. 



Sc. Testa orbiculato-ovatd, heliciformi, vertice depresso ; anfractihus tribus, convexis ; 

 in medio cingulis duobus transversis instructis ; longitudinaliter plicatis, plicis elegantissime 

 curvatis, interstitiis transversim striatis. 



Shell orbiculato-ovate, with a depressed apex; volutions three, convex, and 

 rather tumid, with a double keel in the middle or outermost portion of the volution ; 

 longitudinally plicated, with elegantly curved and crispated ridges, between which 

 it is spirally striated. 



Diameter, j^ of an inch. 



Locality. Cor. Crag, Sutton. Recent, Scottish Coast. 



I have unfortunately but one slightly injured specimen, having a part of the 

 outer lip destroyed ; however, what remains corresponds so well with Dr. Fleming's 

 clear and copious description, that I have no hesitation in assigning it to his species. 

 It appears to be rather less elevated in the spire than 8c. aspira, Phil. (En. Moll. 

 Sic. 1844, vol. ii, p. 160, t. 25, f. 17), which it otherwise much resembles.* 



Emaeginula, Lam. 1801. 



Emarginulus. Montf. 1810. 

 Subemabginula. Blahiv. 1825. 

 Hemitoma. Swains. 1840. 

 Clypidina. Gray, 1847. 



Gen. Char. Patelliform, conical, or clypeiform ; vertex more or less elevated, 

 and curving slightly backwards ; aperture elongato-oval ; anterior margin with a 

 fissure, thickened within ; exterior generally raised and decussated ; muscular 

 impression open in front. 



Several shells, possessing this patelliform character, with a fissure in front for 

 the passage of the water to the branchiae, but differently situated, were placed by 



* Since the above was written I regret to say that the specimen, while in the hands of the engraver, 

 was lost. The figure above referred to is, I believe, a faithful representation of what it was. 



