PHOLAS. Panama Shells. 301 



ous, at one seventh of the length from the anterior extremity : 

 ligament large, with stout nymph zeal callosities : teeth large in 

 old shells. 



Length 5.8 inches ; height 1.3 inch ; breadth 1 inch. 



Station. In coarse sand, among stones, near low water 

 mark. 



Habitat. Panama ; C. B. A. ! 



55 specimens were collected on the reef. It is an edible spe- 

 cies, and many of our specimens were obtained from the natives, 

 who were digging them for food. 



Family PHOLADID^E. 



512. Pholas crucigera. 



Synonymy. 



Pholas cruciyera Sowb. in Proc. Zool. Soc. Lond. p. 69. July 1834. 



cruciger Mull. Synop. Nov. Test. Viv. p. 236. May 1836. 



- Orb. Voy. Amer. Mericl. Moll. p. 499. 1843. 



cruciyera Hanley Supp. Wood Ind. Test. pi. 11. 



f. 53. 1845? 



Hanley Descr. Catal. p. 6. 1845? 

 Sowb. Thes. Conch. Index. 1849. 



crucifera Sowb. Thes. Conch, p. 489. No. 13. pi. 



104. f. 24-6. 1849. 

 'cmcigera Phil. Abbild. III. pi. II. f. 4. Nov. 1850. 



Station. In soft sandstone at half tide ; in soft stone at low 

 water; in hard clay at the depth of 13 fathoms; Cuming ! 

 Sowerby. 



Habitat. I. of Puna, Bay of Caraccas, and Gulf of Nicoya ; 



Cuming ! Sowerby : also Miiller. 

 Central America ; Hanley : also Orbigny : also 



Jay. 



Panama ; C. B. A. ! 

 1 specimen was found. 



