316 TESTACEOUS MOLLUSCA. 



— Var. ? P. Echinata, Brod. Z. P. 1834. Upper valve with rows 

 of prickles ; its margin purplish. 1&. W. Indies. 



A. Zelandica. Gray, in Die/. N. Z. — Placuanomia Z. Gray, 

 Z. P. 1849, p. 123 ; Cat. An. p. 13. Suborbicular, white, smooth ; 

 upper valve with distant radiating grooves ; internally dark green : 

 subcentral scars 2, confluent, upper one oblong and longitudinal, 

 lower one rather small and more transverse : perforation large, only 

 slightly embracing the thin plug. N. Zealand. l 



TKIBE BKACHIOPODA. 



Animal with 2 opposite ciliated elongated arms near the mouth, that 

 are coiled up when at rest: mantle with 2 separated lobes in front, 

 which envelope the body. Shell bivalve, inequivalve, equilateral; either 

 attached to marine bodies by contact, by a tendinous cord or a pedicle. 



CRANIA. 



Inequivalve, equilateral, rounded-subquadrate ; upper valve depressed 

 convex, its vertex subcentral; lower valve testaceous, agglutinated to 

 marine substances by its entire surface : neither hinge, teeth nor liga- 

 ment. 



C. Personata. Hcening. (as of Lain. 1) Cran. p. 2, f. 1. — Sow, 

 Th. 1, p. 367, t. 73,/. 9. Lower valve rounded-ovate, retuse above; 

 upper scars oblique, subreniform ; lower ones united together, forming 

 one orbicular tuberculated impression, without any rostellum ; disk 

 with a radiating palmated impression ; lower margin thickened, 

 granular, §-. India. According to Lamarck, the upper valve is 

 convex-conical. It is unknown to me. 



C. TURBINATA. ANOMIA T., PoU, t 30, /. 15. — C. RlNGENS, 



Hcening. Mon. Cran. p. 3, /. 2. — Desh. E. 2, pt. 2, p. 16, and ed. 

 Lam. 7, p. 302.— Phil Sic. 1, p. 100.— / Sow. Th. 1, p. 367, t. 73, 

 /. 10, 1. Suborbicular, retuse and slightly narrowed above; lower 

 valve having its upper scars ovate, subtriangular, transverse or rather 

 oblique ; its lower scars approximate to them, of the same size, united 

 into a single transverse oblique hollow, that is rounded on both sides, 

 and scarcely contracted in the middle ; no rostellum ; the radiating 

 foot-shaped impressions of the disk indistinct ; margin thickened, espe- 

 cially below ; upper valve thin, rough, conic, concentrically striated, 

 apex acuminated, often submarginal. Mediterranean. Sowerby's 



1 See, too, the P. Abnormalis, Cepio, Alope, Ione and Colon of 

 Gray's Museum Catalogue of Anomiadse (previously in Z. P. 1849). 



