330 TESTACEOUS MOLLUSCA. 



perforation, and its rather more extended and somewhat differently 

 formed internal appendage. 



T. Japonica. Sow. Th. 1, p. 344, t. 68,/. 7, 8. — Terebratulina J. 

 Gray, Brack, p. 50, probably. Oblong, rounded ventrally, thin, 

 whitish ; valves nearly equally convex, with numerous radiating rather 

 irregularly dichotomous stria?, which very minutely denticulate the 

 edge, and are very closely arranged on the sides near the hinge, 

 where the outline is rather flattened. Upper valve somewhat pro- 

 duced and truncated dorsally ; perforation moderately large, very 

 oblique, incomplete; hinge-area indistinct, with obsolete deltidia; 

 internal appendages small, one-third the length of the valve, with 

 two narrow little branches and then a broad flexuous loop. l^V 

 Japan. The loop is termed " anelliform" by Gray. 



T. Angusta. Adams and Reeve, Samar. p. 71, t. 21,/. 2. — Teee- 

 bratulina A. Gray, Brack, p. 50. Elongated- oval, slightly com- 

 pressed, transparent white, radiated with very fine and close rugulose 

 costellse ; beak truncated ; valves nearly equal, with a slight mesial 

 indentation, a little sinuated ventrally. ■££. Japan. Very like 

 T. Caput-serpentis. 



T. Cancellata. Kock in Kust. vii. 1, t. 2, b, /. 11, 2, 3. — Sow. 

 Tk. 1, p. 358, t. 71, /. 93, 4, 5. — Terebratulina C. Gray, Brack, 

 p. 50. Ovate-oblong, ventricose, brownish, with very slender close- 

 set radiating striae, that are finely decussated by the lines of growth ; 

 edge very finely crenulated, flexuous. Valves very unequal ; upper 

 one the more convex, oblong, acuminated and truncated dorsally ; 

 lower one subovate, with the dorsal edges sloping. Perforation large, 

 round, complete ; hinge-area rounded, with rather large obsoletely 

 grooved deltidia, that are united in the middle ; loop short. ■§■. 



T. Abyssicola. Adams and Reeve, Samar. p. 72, t. 21, /. 5. — 

 Terebratulina A. Gray, Brack, p. 51. Subovate-trigonal, tapering 

 to the beak, subtruncated and retuse ventrally, pellucid flesh-colour, 

 obscurely radiated with obsolete costellse and raised striae ; beak pro- 

 duced ; perforation moderate, entire. Valves nearly equally convex ; 

 lower one bluntly acuminated dorsally, with a slight mesial depression. 

 |. Cape G. Hope. 



T. Cumingii. — Terebratulina C. Davids. Z. P. 1852, 1. 14, / 17, 

 8, 9. — Gray, Brack, p. 61. Very small, somewhat pentagonal, gibbous, 

 yellowish white, rayed with very numerous minute intercalated raised 

 striae ; with very small ears ; beak small, obliquely truncated by a 

 round incomplete perforation; deltidia separate; margins' slightly 

 sinuated ventrally ; loop anelliform. %. Chinese Seas. 



T. Evansii.— Terebratella E. Davids. Z. P. 1852, 1. 14,/. 7, 8, 9. 

 — Magas E. Gray, Brack, p. 99,/. 11, 2. Subovate, pale red, with 

 a few unequal bifurcated ribs ; beak tapering, slightly recurved, with 



