3. Corbis. 
1. C. fimbriata, t. 355. f. 4. 
Fam. 2. Ungulinide. 
Mantle lobes united. Pedal opening moderate, inferior. 
Gills 
two on each side; outer small. Siphonal aperture single (anal). 
Lips moderate, lanceolate. 
1. UNGULINA. 
Lk. U. rubra, t. 356. f 3: 
2. MITTREA. 
1. M. brasiliensis, t. 356. f. 1. 
Suborder IT. SuBMyTILACEA. 
Foot large, compressed. Anterior adductor muscles nearly as 
large as the hinder. 
A. Shell free. Periostraca brown, hairy. Marine. 
Fam. 3. Astartide. 
Foot compressed, subquadrate. Pedal opening elongate. 
Shell 
covered with a thick brown periostraca. Cardinal teeth 2° 3, diver- 
ging, broad, triangular ; central bifid; hinder lateral of the left valve 
double.—See Ann. & Mag. Nat. Hist. xiv. 1854, 21. 
1. ASTARTE. 
1. A. damnoniensis, t. 326. f. 2. 
2. A. inerassata, t. 326. f. 4. 
3. A. semisuleata (fig. 18). 
Fig. 18.—Astarte semisulcata. 
pp’, adductor muscles. 
