300 0. F. von Mollendorff— T7ie Lan'dshells of Perah. [No. 4, 



inner sides of all the wliorls being visible, aperture triangular, slightly- 

 oblique, very irregular, having a tooth on the penultimate whorl and a 

 groove (" sillon ") in the upper part ; 6 whorls, linear suture." Diam. 

 maj. 7, alt. 3 mill. 



Hab.— Mt. Tch^kel in the valley of the river Pluss. 



This description is not sufficient to enable one to form an idea of 

 the value of the species, which has to be compared with the several 

 species described from the Malay peninsula. 



2. Ennea peeaeensis, Godwin- Austen & G. Nev. 

 Godwin-Austen & Nevill, P. Z. S., 1879, p. 735, t. lix, f. 2. 



Dr. Townsend found two apparently immature specimens of an 

 Ennea at Buket Pondong, which the late Mr. G. Nevill considered to be 

 full-grown and to be the type of a new subgenus of Ennea. Col. God- 

 win-Austen, however, deemed it best, considering only two specimens 

 were found and that these were so similar in general form to immature 

 specimens of Ennea stenopylis, Bens., from the Khasi Hills, not to found 

 this new subgenus until further examples were obtained proving that 

 the shell was a mature form. The results of Mr. Hungerford's investi- 

 gations have justified Col. Godwin- Austen's caution. He found this 

 Ennea in different stages of maturity, some entirely corresponding to 

 the figure above quoted, but also some full-grown. The diagnosis has 

 accordingly to be altered as follows : — 



Testa aperte perforata, cylindraceo-claviformis, sol{dula,nitida, virides- 

 centi-crystalUna, anfr. 2 apicales fere glahrati, tertius confertim costulatus^ 

 reliqui 4|- costulis validis, pla7i{usculis, suhdistantihus, paullum arcuatis 

 sculptiy ultimus penultimo angustior, circa umbilicum valde compresstcs, 

 ohtuse carinatus, antice suhstrangulatus, scrohiculatus. Apertura fere 

 verticalis, rotundato-tetragona, peristoma latiuscule expansuniy albolabia- 

 tuTYi, margine externo ad i7isertio7iem subito attenuato, sinuato. Lamella 

 parietalis valida bisque ad marginem producta, callo dentiformi in palate 

 opposite. Long. 4, diam. 2 mill. 



The other teeth which immature specimens show on the columella 

 and in the palate, disappear in the full-grown shell. The analogy with 

 E. stenopylis, Bens., pointed out by Godwin- Austen, exists also in full- 

 grown specimens. E. perahensis is, however, a little longer, more cylin- 

 drical, the costulation more distant, and the ribs higher and less 

 arcuate. 



Our species as well as the following one belongs to the group of 

 Indian and Chinese species for which the late Mr. Nevill has founded 

 the subgenus Martensia. This name has, however, been pre-occupied by 

 Semper (Landsch-Philipp., I, 1870, p. 42) for a genus of the Zonitidce, 



