142 
REPORT ON ZOOLOGY, MDCCCXLII : 
Kiener under the name of C. stercus-muscarum. Say, one of which only 
corresponds to it (Rev. Zool. 1842, p. 26). C. cancellatum, Lea, 
(Sillim. Amer. Journ. xlii. p. Ill) ; suh-umhilicated ; furrowed longi- 
tudinally ; striped transversely ; mouth beneath protracted to a canal. 
Crepidula acuta, Lea (Sillim. Amer. Journ. xlii. p. 108) ; convex, 
smooth, brownish ; apex pointed, straight ; plate triangular, white ; 
mouth elliptical ; Delaware Bay. 
Calyptrcea cinerea, Reeve, Proc. p. 50, from Cape Horn. 
Owen describes a new genus, Lithedaphus. It differs from Calyp- 
trcea in having a second or ventral shelly valve. The head is long and 
sub-cylindrical ; between the head and foot is found a peculiar process, 
like a second head, but which is only a duplicature of the mantle. The 
branchiae are composed of two short parallel rows of conical processes. 
The snout encloses a long horny tongue. The species is called 
L. longirostris. (Proc. Zool. Soc. 1842, p. 147.) 
POMATOBRANCHIA. 
Of this division, Mdller only gives some new Greenland 
species. 
Bullcea punctata ; shell oblong, white, with fine pointed lines. 
Bulla turrita; small, cylindrical, white, spire drawn forwards; a 
narrow umbilical cleft. 
B. corticata. Beck ; cylindrical, imperforate, yellow, with undulating 
longitudinal stripes ; apex sunk, covered by the swell of the columella. 
B. Reinhardii, Holb. (B. insculpta, Totten ?) B. suhangulata ; 
bellied, yellow, angular in the middle of the whorl ; spire flat. 
GYMNOBRANCHIA. 
Milne Edwards has observed, in a Calliopoea at Nizza, peculiar canals 
which communicate with the anterior portion of the digestive canal. 
There are two longitudinal vessels from which many branches arise ; the 
anterior go to the feelers, the others pass to the processes on the back, 
usually considered as gills, where they ramify two or three times. All 
these vessels are soon filled after the animal has taken food, and can be 
easily observed from its transparency. (Annales des Sc. Natur. xviii. 
p. 330.) 
Joshua Alder and Albany Hancock have given descriptions of seven- 
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