136 Biniiey on Terrestrial MoUusks. 



slate-color, superior tentacles darker, short, thick, bulbous ; eyes 

 large, distinct ; foot two-thirds of the length of shell ; whitish, long, 

 very narrow, rounded at tail ; body narrower than foot. 



In motion they are exceedingly graceful, at times poising their 

 beautiful shell high above their body, and twirling it round not 

 unlike tlie PInjsa, again hugging their pretty harp close to the 

 back ; the shell when in this last position continually oscillates as if 

 the animal could not balance it. It rarely ever moves in a straight 

 line, but is always turning and whisking about, and this is done at 

 times very quickly and abruptly. 



Mighel's description of Pupa costulata is as follows : — 



Sliell ovate-conic, scalariform, light yellowish-brown, thin and fragile, 

 wliorls four, convex, the last two prominently ribbed, the first two smooth ; 

 suture distinct; aperture semicircular, slightly oblique, unarmed; lip 

 simple or modified by the last rib ; umbilicus distinct. Length, -f^ inch ; 

 breadth, nearly yV- Hab. Portland. 



BULIMUS MARGIN ATUS S.w vol. ii. p. 288, pi. Hi. fig. 1. 



Cyclostoma marginata Say, (Biiiney's ed.) p. 22. 

 BuHmus marginatus Pfeiffer, Malac. Blatt. ii. 94. 

 Bulimus fallax GoubU, in Terr. Moll. 1. c. 



Stimpson, Shells of N. E. p. 84, (absq. desc.) 

 Pupa fallax Say, (Binney's ed.) p. 28. 



Pfeiffek, 1. c. iii. 533. 



Chemnitz, ed. Nov. (1844,) p. 58, pi. 12, figs. 20, 21. 

 Pupa Parraiana Orbigny, Moll. Cuba, p. 181, pi. xii. figs. 9-11, (1853). 



I have retained the first specific name given by Say, at 

 the suggestion of Pfeifler, (Malak. Blatt. 1856, ii. p. 13, in 

 the review of Terr. Moll.), who justly observes that if the 

 species is referred to BuHmus, no name has the priority 

 over it, as B. marg-inatus Pf. is now considered a synonym 

 of B. Gidlliani, Petit. 



As for the name albilahris, it was suggested by Adams 

 only because marg-i/iofus was preoccupied. 



Gould (Invert. 192) considers Pupa plarida Say as a 

 synonym of this species; and Pfeiirer (ii. 309) makes it 

 var. /^ of viurginalus. 



