SCALARID.A. 291 
Distr.—150 sp. Mostly tropical; Greenland, Norway, Britain, 
Mediterranean, West Indies, China, Australia, Pacific, West 
America. Fossil, nearly 200 sp. Trias—; Britain, North 
America, Chili, India. SS. pretiosa, Linn. (Ixvi, 42). 
Shell mostly pure white and lustrous; turreted; many-whorled ; 
whorls round, sometimes separate, ornamented with numerous 
transverse ribs; aperture round; peristome continuous. Oper- 
culum horny, few-whorled. 
Animal with a retractile proboscis-like mouth ; tentacles close 
together, long and pointed, with the eyes near their outer bases ; 
mantle-margin simple, with a rudimentary siphonal fold; foot 
obtusely triangular, with a fold (mentum) in front. Sexes dis- 
tinct; predaceous. Dr.Gould fed them on raw beef, which they 
eat voraciously ; tongue armed with numerous simple uncini. 
Range from low-water to 80 fathoms. The animal exudes a 
purple fluid when molested. 
cLATHRUS, Oken. Shell moderately thick, whorls united, 
longitudinal ribs numerous, aperture suboval, umbilicus covered 
by the left lip. S. communis. Lam. (lxvi, 38). 
opALIA, H. and A. Adams. (Psychrosoma, Tapparone-Canefri. 
Compsopleura, Conr.) Shell turriculated, imperforate, whorls 
united, the last with a spiral rib at the base. S. coronata, Lam. 
(Ixvi, 39). 
AM@A, H. and A. Adams. Shell turriculated, thin, whorls 
united, cancellated, with some thin irregular varices; aperture 
semilunar, interior lip gibbous in the middle, exterior lip thin, 
simple. S. magnifica, Sowb. (Ixvii, 45). 
CIRSOTREMA, Moérch. Shell turriculated, solid, whorls cancel- 
lated, with a few irregular thick varices ; mouth circular, outer 
margin of aperture thickened with an externally crenulated lip. 
S. varicosa, Lam. (xvi, 40). 
acirsA, Moreh. Shell turreted, thin, whorls united, varices 
obsolete, outer lip thin, simple. S. Hschrichtii, Holb. (1xvi, 43). 
ruNIs, Seeley, 1861. Shell turreted, thin ; whorls ornamented 
with transverse laminar ribbings and usually also with spiral 
strie,so as to produce a cancellated surface; aperture ovate, 
with thin margins, anteriorly subeffuse. S. elongata, Seeley 
(ixvii, 46). Fossil. Cambridge Greensand; England. Inter- 
mediate between Sealaria and Turritella. 
crossEA, A. Ad. Shell turbinate, umbilicated, white; whorls 
convex, cancellated, simple or with varices; aperture roundish, 
anteriorly angular, somewhat produced and canaliculated; umbil- 
icus surrounded and narrowed by acallus. 2 sp. Japan. S. 
miranda, A. Ad. (1xvii, 47). 
ACRILLA, A. Ad. Shell moderately thick, with very numerous, 
equal, transverse ribbings, base distinctly keeled at the periphery, 
outer lip thin. S. acuminata, Sowb. (Ixvii, 48). East Indies. 
