29 
Fam. 3. Saxicavide. 
Foot small, cylindrical, inferior, byssiferous. Gills two on each 
side. Lips small. Siphons moderate. Shell solid. Hinge-teeth 
rudimentary. Cartilage thick, marginal. 
1. SAXICAVA. 
1. S.ruposa,,t. 339. f. 1, t: 347..£..7,.9, ¢.. 372. f. 4. 
2. S. rubra, t. 347. f. 8. 
2. PANOMYA. 
1. P. norvegica, t. 346. f. 1. 
Fam. 4. Pholadomyade. 
Foot short, compressed, with a small bifurcate pedal appendage 
behind. Siphons united. Pedal opening small. Gills two on each 
side, thick, united behind the body. Shell oblong, gaping at each 
end. Hinge-teeth rudimentary or none. Cartilage marginal, ex- 
ternal. 
1. PHOLADOMYA. 
Fam. 5. Solenide. 
Foot very large, clavate or truncated in front, not byssiferous. 
Pedal opening anterior. Gills two on each side. Shell cylindrical 
or oblong, gaping at each end. Hinge-teeth distmcet. Cartilage 
very large, marginal, on a distinct fulerum. Living sunk im the 
sand. (See Ann. & Mag. N. H. xiv. 1854, 23.) 
* Cardinal teeth1:1. Siphon produced, united. Siphonal muscles 
moderate. Siphonal inflection deep, truncated. 
1. SoLen. 
1. S. vagina, t. 337. f. 1, 2, 3, t. 343. f. 1. 
** Cardinal teeth 2:3. Shell rounded at each end. 
+ Sitphons moderate, separate. Siphonal muscles small. Siphonal 
inflection small, truncated. 
2. ENSIs. 
1. E. Siliqua, t. 342. f. 2, 3, 4, t. 343. f. 2, 3, 4 (fig. 11). 
2. E. pellucidus, t. 344. f. 5. 
Fig. 11.—nsis Siliqua. 
Valves forced open. Mantle divided as far as the ventral foramen, 
to show the foot. 
