128 PROCEEDINGS OF THE ACADEMY OF [1887. 



Abundant at Upolu and Savaii. 



A depressed pyramidal species with a moderate umbilicus, rounded 

 apex and 5 J slightly convex whorls, the last one acutely and com- 

 pressly keeled. The rude and irregular strise of growth resemble 

 interrupted pale scratches. Color luteous, or straw-yellow with a 

 dorsal and basal reddish-chestnut band. Diam. 17 mill. 



Prof. Mousson has described a variety from Kauathia, one of the 

 A^iti Islands, under the name albo-striata. It is probably a distinct 

 species. 



T. tentoriolum, Gould. 



Helix tentoriolum, Gould, Proc. Bost. Soc. Nat. Hist., 1846, p. 

 176 ; Exp. Exp. Shells, p. 63, fig. 53. Pfeiffer, Mon. Hel., p. 119. 



Trochomorpha tentoriolum, Mousson, Jour, de Conch., 1869, p. 

 335. Pease, Proc. Zool. Soc, 1871, p. 474. 



Dr. Gould who described this species from examples collected by 

 the United States Exploring Expedition cites "Upolu" as its hab- 

 itat. As it has not been noticed by subsequent explorers its exist- 

 ence in that group certainly needs confirmation. 



It is a small, trochiform pale greenish species with rounded apex 

 and 6 flattened whorls which are beautifully striated and the last 

 one acutely carinated. Diam. 9, height 7 mill. 



T. navigatorum, Pfeiflfer. 



Helix navigatorum, Pfeiffer, Proc. Zool. Soc, 1854, p. 55 ; Mon. 

 Hel., iv, p. 114; (Videna) Vers., p, 132. Reeve, Conch. Icon., no. 

 1303, pi. 187. 



Trochomorpha. navigatorum, Pease, Proc. Zool. Soc, 1871, p. 474. 



Dr. Pfeiflfer described this species from specimens in the Cuming- 

 ian Collection which were labelled "Navigator Islands." Like the 

 preceding species the above habitat is questionable. 



Pfeiffer says "it is a moderately umbilicated, solid, lentifoi'm species 

 of a purplish-browii, or reddish-grey color, with an obtuse, convex 

 spire, marginated suture and 6 slightly convex whorls, the last one 

 compressly carinated. Diam. I82, height 11 mill. 



T. luteo-cornea, Pfeiffer. 



Helix luteo-comea, PfeiflTer, Proc. Zool. Soc, 1854, p. 56 ; Mou. 

 Hel, iv, p. 186, (Videna) Vei-s., p. 132. Reeve, Conch. Icon., no. 

 1287, pi. 186. 



This, like the preceding species, is described from specimens in 



