20 
c. Shell trigonal, truncated behind. 
6 . Donax. 
1. D. trunculus, t. 319. f. 4, 5. 
2. D. anatinum, t. 319. f. 3. 
3. D. venusta, t. 319. f. 1. 
7. Galathea. 
1. G. radiata, t. 317- f. 1. 
Fam. 10. Scrobiculariadce. 
Mantle lobes free. Pedal opening elongate. Gills only one on 
each side, broad, triangular, thick, united together behind, divided 
diagonally by a subcentral narrow groove, the upper portion the 
least. Palpi very large, flat, thin, triangular. Siphon very long, 
slender, separate from the base. Shell oblong. 
1. Limicola. 
1. L. tenuis, t. 320 a. f. 4, 10. 
2. SCROBICULARIA. 
1. S. compressa, t. 321. f. 2, t. 321 a. f. 1, 2, 4. 
3. Tellinides. 
1. T. timorensis. 
ii. Cardinal teeth diverging, central, laminar, folded. Cartilage 
internal, in a triangular pit near the cardinal teeth. 
Fam. 11. Mactradce. 
Mantle lobes more or less free beneath. Siphons two, elongate, 
more or less united at the base. Foot lanceolate, subanterior. Gills 
two on each side, broad. Lips narrow, elongate, acute. 
* Mantle lobes free. Lateral teeth developed, laminar. Mactraina. 
1. Mactra. 
1. M. stultorum, t. 324. f. 5, 7, 9. 
2. M. lactea, t. 323. f. 4, t. 324. f. 4. 
3. M. glauca?, t. 324. f. 6. 
4. M. neapolitana, t. 323. f. 3. 
5. M. triangularis, t. 323. f. 1. 
2. Spisula. 
1. S. solida, t. 324. f. 2, 8. 
2. S. elliptica, t. 324. f. 1. 
3. S. subtruncata, t. 324. f. 3. 
** Mantle lobes united. Shell oblong, gaping behind. Lutraviana. 
3. Lutraria. 
1 . L. elliptica, t. 325. f. 2, 3. 
2. L. oblonga, t. 325. f. 1. 
