38 AMERICAN JOURNAL 



of the value for purposes of classification, of a knowledge of the 

 lingual dentition of mollusks. 



Imperfect acquaintance with the form of the teeth, and assumed 

 absence of a jaw in Cylindrella, induced distinguished authors to 

 place that genus in alliance with the vermivorous Testaeellea. 

 My late discovery, (Amer. Journ. Conch, iv, 186) of the jaw, 

 with a more perfect knowledge of the teeth, negatives such an 

 arrangement. Well, indeed, may Crosse (Journ. de Conch., 

 Jan., 1869, p. Ill,) remark, " Voila done la classification pro- 

 posde pour les Cylindrelles, par MM. Morch, Albers, Von Mar- 

 tens, A. Schmidt, etc., totalement coulee a fond !" 



Pupa palanga, Less., from the form of shell alone, the animal 

 being unknown, has been placed in Pupa, but evidently belongs 

 rather to Ennea, the teeth of which {^E. hicolor) are described 

 by Guppy, (Ann. and Mag. N. H., Jan., 1866,) as "slender, 

 somewhat hooked." I found one example of P. palanga with 

 the animal, among shells sent to the Brooklyn Historical Society 

 from the Mauritius, by Captain Pike, the United States Con- 

 sul. The lingual ribbon photographed was obtained by me from 

 that specimen. I did not find a jaw, and from the Testacella- 

 like form of teeth believe that none existed. 



I may add that I have placed many microscopic preparations 

 of jaws and teeth of Cylindrella, teeth of P. palanga, &c., at 

 the disposal of my valued correspondent M. Crosse, for publi- 

 cation in the Journal de Conchyliologie. 



T. Bland. 



