210 BIVALVE SHELLS. 



Petricola Roccellaria, Deless. Rec. de Coq. pl. 4. f. 13. 



Hanley, Descr. Cat. p. 52. 



Wood, Ind. Test. Suppl. 2. pl. 11. f. 44. 



Sow.jun. Conch. Man. f. 91. 



Potiez et Mich. Gal. de Douai, ii. 241. no. 3. 



Requien, Cat. des Moll. de Corse, p. 17- no. 40. 



Petit, Journ. de Conch. 1851, p. 289. 

 Ruperelle striee, Fleurian de Bellevue, Mem. sur les Moll. Lithop. 



p.3. 

 Petricola ruperella, Lamk. An. s. Vert. v. no. 9. 



Desh. Encycl. Meth. Vers, iii. 747- no. 3 ; in Lamk. loc. 

 cit. no. 9. 



Deless. Rec. de Coq. pl. 4. f. 14. 



Hanley, Descr. Cat. p. 52. 



Wood, Ind. Suppl. 2. pl. 11. f. 45. 



Petit, Journ. de Conch. 1851, p. 289. 

 Venerupe petricole, Blainv. Malac. pl. 76. f. 2. 

 Sphaenia decussata, Turt. Test. Ins. Brit. p. 38. 



Brown, III. Conch. G. Br. p. 104. pl. 45. f. 3. 

 Petricola lithophaga, Phil. Enum. Moll. Sicil. i. 21. pl. 3. f. 6 ; 

 ii. 20; in Wiegm. Arch. 1845, p. 188. pl. 7. f. 11-14. 



Desh. Expl. Sc. de VAlg. Moll. pl. ^Q. f. 5-9. 



Forbes Sf Hanley, Hist. of Brit. Moll. i. 151. pl. 6. f. 9, 10, 

 & pl. G. f. 1. 

 Hab. Oceanus Europseus. 



8. Petricola rariflamma. 



P. testa ovato-trigona, transversa, inaequilaterali, antice brevi,- 

 turgida, postice attenuata, candida, sub epidermide griseo 

 flammuhs rubro-fuscis ornata, longitudinaliter striata; striis 

 subdecussatis, posticalibus majoribus anticis evanescentibus. 



Petricola rariflamma, Desh. Traite elem. Conch. i. 494. pl. 12. 

 f. 10-12. 

 Hab. Mare Britannicum. 



9. Petricola typica. 



P. testa ovata, sequivalvi, insequilaterali, alba, antice brevissima, 

 inflata, rotundata, postice longiore ; angustiore, hiante, longi- 

 tudinaliter sulcata ; liris lamellosis, posticis subechinatis ; um- 

 bonibus parvis acutis, antice versis. 



Choristodon typicum, Jonas, MoUusk. Beitr. p. 2. pl. 7- f- 3. 

 Hab. Insula St. Thomas, in lapidibus. 



10. Petricola robusta. B.M. 



P. testa subglobosa, sohda, alba, versus apicera fusca ; lineis ele- 

 vatis radiantibus postice distantibus, squamis foraicatis con- 



