ne 
CONCHIFERA. 745 
Ungulina Daupin, Lam. 
This genus is much allied to Lucina, with which DEsHAYES unites it. 
Ungulina oblonga LaM., Buainv. Malac. Pl. 73, fig. 6; from the coast of 
Senegal. Since this animal penetrates stones and corals, the external form 
of the shell is subject to much variety. See on the animal, of which pre- 
viously the shell alone was known, DuverNoy Ann. des Se. nat. sec. Série, 
Tom. 18, pp. 110—122, Pl. v. B. Comp. DrsHarss ibid. Tom. 19, pp. 
B—1T, 
Corbis Cuv. Shell transverse, gibbous. Hinge with two teeth 
under the point, and two lateral. 
Sp. Corbis fimbriata Lam., Venus fimbriata L., D’ARGENY. Conchyl. Tab. 
21, fig. @, Encycl. méth., Vers. Pl. 286, fig. 3, Buatnv. Malac. Pl. 72, fig. 
4; indian Sea. This shell is finely striated longitudinally between grooves 
running parallel to the margin. Hence the French name la Tricotée or la 
Corbeille, of which last the generic name Corbis is a translation. There are 
fossil species of this genus which are as finely or even more finely treliced. 
Family XVI. Saxicavina (or Lithophaga). Lobes of mantle 
as to the greater part concrete, with aperture narrow, anterior, emit- 
ting the small foot. Trachez two, coalesced at the base, tentacu- 
late at the opening. Shell transverse, inequilateral, posteriorly 
elongate, gaping. Ligament external. Two muscular impressions 
remote. Impression of mantle deeply sinuate posteriorly. (Animals 
living in stones, hence the form of shell often irregular.) 
This small family is connected with the genus Venus on the one hand, 
and with Gastrochena on the other; perhaps the genus Saxicava might be - 
placed in the last family. They are marine conchifers like all the following 
families. 
Petricola LAM. (and Venerupis ejusd.) Hinge with two teeth 
in each valve, sometimes with three. Branchie unequal, external 
smaller. 
Venerupis Lam. Trachex separate at the apex alone. Hinge 
with three teeth in one valve, sometimes in both. 
Sp. Venerupis irus Lam., Donaw Irus L., Eneycl. méth., Vers. Pl. 262, fig. 
4, Pout Test. utr. Sic. 1. Tab. 19, figs. 25, 26; hab. Mediterranean ;— 
Vener. perforans LAM., Venus perforans MontaGu. (PHILIPPI has given a 
figure of the Mollusc, see WIEGMANN Archiv f. Naturgesch. 1845, Tab. via. 
figs. 15—18.) 
Petricola Lam. Tracher coalesced at the base, free at the 
terminal part for nearly half their length. Hinge with two teeth 
in each valve, or with only a single tooth in one of the valves. 
