86 RAFINESQUE’S 
I. Family, LINGULARIA. Shell equivalve, longitudinal, 
inequilateral, valves entire, not perforated, 1. G. Linauna of 
Brugiere. 
II. Family TEREBRARIA. Shell inequivalve, one valve per- 
forated or emarginated. 
Ist Section, Macrilia. Shell longitudinal. 
2 G. Dictisma, Raf. Equilateral, the two valves split at the 
summit. : 
3 G. ApLEvROTIS, Raf. 1819. Inequilateral, the great valve per- 
forate, and with a lateral wing. 
4 G. Tricortma, Raf. Equilateral, smaller valve perforate, four 
cavities at the base separated by three septa. 
5 G. Oxzovirss, Raf. Equilateral, the great valve perforate. 
6 G. Maaas (Sowerby) equilateral, great valve with an angular 
opening. 
2d Section, Jsilia. Shell equilateral, nearly equital or hardly 
transversal. 
7 G. TEREBRATULA (Brugiere) great valve perforate. 
8 G. Sprnirer (Sowerby) subequital, great valve with an angular 
opening, hinge with two spiral appendages. 
9 G. GoNoTREMA, Raf. Shell subtransversal, small valve with 
aa angular opening, and interval cavity, hinge short, straight or 
curved. 
3d Section, Puarizra. Shell equilateral, transversal or very. 
broad. 
[8] 
10 G. PLatimitss, Raf. Small valve with an angular opening and 
internal cavity, hinge very long, often longer than the shell which is 
thus winged. 
11 G. PrevurintiA, Raf. Differ from last by the great valve per- 
forate, shell winged also. 
12 G. Pacuitoma, Raf. Inequilateral, with thick edges, hinge 
with a linear opening. , 
13 Strophomenes, Raf. Equilateral, hinge broad, great valve 
notched by a lunulate sinus receiving a lunulate projection of the 
smaller valve. 
Ill. Family ATREMOSIA. Shell inequivalve, valves entire, not 
perforated. 
