P E R N A 



SjDecies 11. (Mus. Cuming.) 

 Pekna Anomioides. Pern, testa oblique longitudinali, 



tenui, subpellueidd, concentrice peculiariter fimlriato- 



laminatd ; lutescente-albd. 

 The Anomia-like Perna. Shell obliquely longitudinal, 



thin, rather transparent, concentrically peculiarly fim- 



briately laminated ; yellowish-white. 

 Hab. California. 



A delicate yellowisii-wliite semitransparent shell, in 

 which the concentric laminse are curiously fimbriated in a 

 blistered-like manner. 



Species 12. (Mus. Cuming.) 



1'ekna Australica. Pern, testa oblique Jlabellatd, tenui, 

 subpellucidd, liris superficiariis serratis irregulariter 

 dense radiatd ; riifescente-albd. 

 The Australian Perna. Shell obliquely fan-shaped, 

 thin, rather transparent, densely irregularly rayed 

 with serrated superficial ridges ; reddish-white. 

 Hab. Australia. 



Broadly obliquely fan-shaped, of thin, transparent sub- 

 stance, peculiarly sculptured with irregularly fiexuous de- 

 licately serrated superficial ridges. 



Species 13. (Mus. Cuming.) 

 Persa Califoenica. Pern, testa oblique trigond vel 

 Jlabellatd, tenuiculd, Icevi ; lutescente-albd, livido-pur- 

 pureo nebulatd. 

 The Californian Perna. Shell obliquely triangular 

 or fan-shaped, rather thin, smooth ; yellowish-white, 

 clouded with livid purple. 



Conrad, Journ. Acad. Nat. Sci. Phil. vol. vii. p. 25. pi. 



19. f. 13. 

 Hab. California; Conrad. Honduras; Dyson. 



Chiefly distinguished by its PedmnAiVt form, and 

 clouded livid-piu-ple colouring. 



Species 14. (Mus. Cuming.) 



Perna serratula. Pern, testa trigono-orbiculari, tenui, 

 pland, laminis tenuibus serratulis dense concentrice ra- 

 diatd; sordide alba. 



The finely-serrated Perna. Shell triangularly orbi- 

 cular, thin, flat, densely concentrically rayed, with 

 flnely serrated laminse ; dead white. 



Hab. Islandof St. Vincent; Guilding. Philippine Islands; 



Well characterized by the delicately serrated laminae 

 with which the whole surface is closely sculptured. 



Species 15. (Mus. Cuming.) 

 Perna jiarsupium. Pern, testa orbiculari, solidiusculd, 



rude concentrice laminatd ; sordide alba, purpurascente 



tinctd. 

 The purse Perna. Shell orbicular, rather solid, rudely 



concentrically laminated ; dead white, tinged with 



purple. 

 Lamarck, Anim. sans vert. vol. vii. p. 77. 

 Hab. Philippine Islands. 



Of a simply rounded form, of rude, rather solid sub- 

 stance, indistinctly roughly laminated. 



March, 1858. 



