1879.] SHELLS FROM PERAK AND THE NICOBAR ISLANDS. 735 



found by future naturalists who may visit the country with more 

 leisure than Dr. Townsend could give during the progress of a 

 military expedition. 



The thanks of all interested in malacology must be given him for 

 the interesting new forms he has made us acquainted with. 



The Nicobarese shells were collected by Dr. Ferdinand Stoliczka, 

 and were among the large and valuable collections which he bequeathed 

 to the Indian Museum, Calcutta. 



Ennea perakensis, n. sp. (Plate LIX. fig. 2.) 



Testa parva, viridescenti-crystallina, nitida, solida ; spira paululum 

 elevata, trochiformis, profunde et aperte umbilicata in modo 

 " solariformi" dicto, apice obtuso at que Icevi; superne elegant issime 

 regulariterque transversim sulcata, sulcis pervalidis, planiusculis 

 subrectisque (vix flexuosis) ; anfractu tertio sulcis confertis, 

 ultimis duobus sulcis cequalibus atque distantibus ornatis ; subtus 

 ad basin subplana, circa umbilicum subcarinata, prope periphe- 

 riam sulcis validis subito fere evanidis, in umbilico rursus con- 

 spicue patentibus ; anfract. 5, convexiusculi, ultimo basi piano ; 

 apertura perfecte quadrangular is, dentibus 4 coarctatis, dente 

 parietalipercrasso, oblique contorto, conspicue prominente ; perist. 

 album, incrassatum, marginibus subparallelis, fere rectis, margine 

 externo inferne dente parvo munito et ad basin abrupte angulato, 

 margine basali cum dente, paululum majore, in medio munito, 

 margine columellari superne callositate levi ad dentem parietalem 

 juncto, reflexo et paululum obliquo, inferne acute angulato et dente 

 valido munito. 

 Alt. If, diam. 2 mill. The other specimen measures, alt. U, 

 diam. 1| mill. (G. N.). 



I obtained two fine specimens of this remarkable new species, by 

 washing the larger shells obtained by Dr. Townsend in the Buket 

 Pondong cave. I know of no shell which surpasses it in interest, as 

 regards sculpture: the apical two whorls are smooth, the next 

 closely, transversely sulcated, and the last two very conspicuously 

 distantly scs the '« sulci " are almost upright, only slightly flexuous, 

 with their interstices about twice as broad as themselves ; under- 

 neath, the base appears beautifully fimbriated near the margin, 

 owing to these sulcations apparently suddenly stopping a short 

 distance from the periphery, though in reality one can trace them 

 across the base ; but to do so requires the lens and a good light. To 

 all appearance the middle of the base is smooth, polished and shining. 

 These sulcations appear again within the deep, open, and solariform 

 umbilicus, as conspicuous as ever. The characters of the aperture 

 &c. are so excellently represented in Colonel Austen's figure, that it 

 would be a waste of time to further describe them (6?. N.). 



From the peculiar form of this shell, Mr. Nevill considered it a 

 new subgenus of Ennea ; and following his description of it he says : — 

 "It is of interest to note that, in the very extensive collection made 

 by my friend Dr. Townsend in these caves, there was not so much 

 as a broken piece of any species of Streptaxis or Ennea, both so 



