Geographical Distribution of the Terebratulse. 181 



Terebratula truncnta, Lamarck. 



• disculus, De Blainville. 



Terebratella truncata, D'Orbigny. 



Terebratula monstrosa, Scacchi. 



Orthis truncata, Philippi. 



Megerlia truncata. King. 



Orthis oblita, Michelotti. 



Megathyris oblita, D'Orbigny. 



Hab. Mediterranean (affixed to corals at depths of from 50 

 to 100 fathoms). Cape Finisterre (at a depth of 90 fathoms). 

 Canaries. 



Mr. Jeffreys possesses a specimen of this well-known species, 

 formerly belonging to Dr. Turton, which is said to have been 

 dredged in Torbay ; but its recorded British habitat has not been 

 confirmed by the discovery of any further specimens. 



Subgenus & Kraussia, Davidson. 



Apophysis a central septum, from the extremity of which diverge a 



pair of fan-like processes. 



35. Terebratula (Kraussia) rubra, Pallas, Misc. Zool. pi. 14. f. 2- 

 11 ; Conch. Icon. pi. 9. f. 37 a, b, c. 



Anomia rubra, Pallas. 



promontorii Bonce Spei, Chemnitz. 



Capensis, Graelin. 



Terebratula rubra, De Blainville. 



Capensis, Krauss. 



Algoensis, Sowerby. 



Kraussia rubra, Davidson. 



Hab. South Africa. 



This very interesting species, though admirably figured, with 

 its loopless bifurcating apophysis, nearly a century ago by Pallas, 

 and again a few years later by Chemnitz, was not known to 

 Valenciennes when preparing his monograph of the genus for 

 Lamarck's * Animaux sans Vertebres,' nor even to Sowerby when 

 publishing his monograph in the ' Thesaurus.' It is characterized 

 by a remarkably short beak and large foramen ; and the deltidium 

 plates are accordingly very widely separated. The colouring, 

 which is mainly on the radiating ribs, is bright coral-red. Mr. 

 Sowerby's T. Algoensis, pronounced by Mr. Davidson to be a 

 Terebratella, and by Dr. Gray to be a Kraussia " scarcely dif- 

 fering from K. pisum," is founded on a bleached fragmentary 

 ventral valve, preserved in the British Museum, o{ Kraussia rubra. 



36. Terebratula {Kraussia) cognata, Chemnitz, Conch. Cab. viii. 

 p. 78, pi. 76. f. 688 a, ^ ; Conch. Icon. pi. 9. f. 36 a, b. 

 Cognata Anomi<B craniolaris basi perforata, Chemnitz. 



Hab. South Africa. 



Kraussia cognata (of which a single specimen in Mr. Cuming's 



