THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY 



[THIRD SERIES.] 

 No. 8. AUGUST 1858. 



VIII. — On the Structure and Position of the genus Teredina of 

 Lamarck. By Dr. J. E. Gray, F.R.S., V.P.Z.S., Pres. Ent. 

 Soc. &c. 



Lamarck, in the ' Histoire Naturelle des Animaux sans Ver- 

 tebres/ published a genus under the name of Teredina for a 

 Miocene fossil shell which he had before referred to Fistulana*, 

 a genus which he, in the work above referred to, further 

 separated into several others, Teredina among the rest. 



Lamarck formed the genus Teredina, with Aspergillum, Cla- 

 vagella, Fistulana, Septaria, and Teredo, into a family, which he 

 called " les Tubicoles," because they live in tubes, and separated 

 them for this reason from " les Pholadaires. iy 



The genus is thus denned by its author, who was evidently 

 forming a character to separate it from Aspergillum, Clavagella, 

 and Teredo : — "Fourreau testace tubuleux, cylindrique ; a l'extre- 

 mite* poste'rieure fermee, montrant les deux valves de la coquille, 

 a l'extremite anterieure ouverte" (vol. v. p. 438). 



M. de Blainville, in his * Manuel/ united the two families of 

 Lamarck into one, under the name of Adesmacece, and arranges 

 the genus Teredina between Teredo and Pholas ; he gives the fol- 

 lowing improved generic character, derived from a very perfect 

 specimen in the collection of M. Deshayes : — 



" Coquille e'paisse, ovale, courte, tres baillante en arriere, 

 equi valve, inequilaterale ; les sommets bien prononces, un cuil- 

 leron epais sur chaque valve. Une piece medio-dorsale, ovale, 

 en bouclier, sur les sommets de la coquille, et se prolongeant en 



* The genus Fistulana, as first established in Ann. Mus. vii. 425, was 

 divided, in the work above referred to, into several genera, and, as charac- 

 terized in his later work above quoted, is a Teredo, which has been formed 

 into a genus named Xylotrya by Leach. 



Ann. $ Mag. N. Hist. Ser. 3. Vol. ii. 7 



