FAMILY 2. CAPULACEA. 33 
Patella trochiformis, Gmelin. 
Lepas concamerata, Martini. 
Infundibulum ————? De Montford. 
Subgenus Trochatella, Lesson. 
Pl. CXLIV. Fig. 3. 
CALYPTRHA LIGNARIA (var. a.), Broderip, Transactions Zool. Soc., vol. 1. 
p. 199. pl. 27. f.8*. D’Orbigny, Voy. dans l Amérique Méridionale, 
pl. 58. fig. 7 to 9. 
Pl. CXLIV. Fig. 4. 
CaLypTR&A CINEREA, Nobis. Proceedings Zool. Soc. 1842. 
Pl. CXLIV. Fig. 5, 6 and 7. 
CALYPTR#EA LITHEDAPHUST. 
HIPPONYX, Defrance. 
Testa obliqué conoidea, pileiformis, poculo testaceo solido interdum sus- 
tentata; vertice retrorstim inclinato ; impressionibus muscularibus 
in forma equi calcei anticé rotundatis, posticé connatis, in poculo 
zque ac testa imbutis. 
The genus Hipponyx was instituted by Defrance for the purpose of 
associating certain of the Pileopses of Lamarck which he noticed to pos- 
sess the singular property of depositing a solid shelly cup for their sup- 
port. It was first observed by this author in the fossil state, and although 
it was not till some time after that any living specimens were found, he 
+ The word lithedaphus (from dios and édagos), signifying a stone pavement, is proposed 
by Professor Owen as characteristic of the singular habits of this mollusk; we therefore use 
it provisionally as a specific name, until we hear the result of his anatomical examination. 
VOL. II. F 
