20 PROCEEDINGS OF THE ACADEMY OF [1870. 



Vertigo pediculus, Pfeiffer, Vers. p. ITT. 



Pupa uphyradium (Samoensis), Paetal, Cat. Conch. Sam. p. 108. 



Pupa nitens, Pease, Proc. Zool. Soc. 1860, p. 459 Pfeiffer, Mon. Hel. 



vol. VI. p. 329. 

 Pupa hyalina, Zelebor, Pfeiffer. Mori. Hel. vol. VI. p. 329. 

 ? Vertigo nacca, Gould, Proc. Bost. Soc. 1862, p. 280. 



The few specimens received differ none from Tahitian and Cook's 

 Islands examples. 



At the latter location I found them in vast numbers on stony 

 ground in a grove near the seashore, but comparatively rare in 

 the mountain ravines. It occurs in more or less abundance at all 

 the Polynesian Islands, also at the Viti group, and perhaps ex- 

 tends further west. 



I obtained Mr. Pease's type specimens of nitens at Ebon, a low 

 coral island in the Caroline or Marshall group. When he de- 

 scribed that species he was not aware that Mr. Shuttleworth had 

 anticipated him in his pediculus^ described from Tahitian and 

 Marquesian examples. 



It is evident from Mr. Pease's remarks on page 463, Proceedings 

 of the Zoological Society for 1871, that he entertained doubts of 

 the specific weight of his nitens and Gould's nacca. 



Many years ago I collected a species of Vertigo near Hilo, 

 Hawaii, where Dr. Gould's types were obtained, and as near as I 

 can recollect they differed none from pediculus. 



The description of nacca is so brief and unsatisfactoiy that I 

 cannot decide with certainty, so have marked it doubtful. 



The following is Gould's diagnosis: 



"T. ovata, lucida, alabastrica, tennuissima, striata; aufr. 4 -f- 

 ventricosus apice ottuso ; sutura profunda ; apertura subcirculai is 

 dente palatali (interdum bifido) dente columellari, dente basaii 

 denteque labiali armata; peritremate valde reflexo ; umbilico ri- 

 mato. Axis j 1 ,,, diam. Jj, poll" (Gould). 



With respect to Zelebor's hyalina, which is elaborately de- 

 scribed, I do not hesitate to add it to the synonymy of pediculus. 



The variation of pediculus consists in the more or less oblong 

 form, distinctness of striation, more or less turgid whorls, com- 

 pression of the base, and size of the rim ate umbilicus. The 

 parietal lamina is usually double, though often single, or bifurcate, 

 and like the columellar tooth is constant. The palate is usually 

 furnished with three teeth, which may be considered the normal 

 number, though they frequently vary, and may be altogether 



