from Sumatra^ Java^ and Borneo. 131 



Leptopoma undatum^ Metcalfe ; 7, L. sericatum^ Pfr. ; 8, L. 

 Whiteheadi, sp. n. ; 9, Opisthoporus pterocy chides, Pfr. 



The new species from Sumatra were partly obtained by Mr. 

 H. 0. Forbes and partly by Mr. Carl Bock, both well-knowa 

 eastern travellers. 



Helicarion Bochi. 



Testa anguste perforata, viridi- cornea, nitida, suborbicularis ; an- 

 fractus 4-5, convexiusculi, rapide accrescentes, striis spiralibus, 

 tenuissimis incrementique lineis sculpti, ultimiis superne rotunda 

 angulatus, supra angulum concave excavatus spiraliterque subsul- 

 catus, inferne striis concentricis minutissimis lineisque incrementi 

 ornatus ; sutnra profunda, canaliculata ; spira paulo elevata ; 

 apertura magna, parum obliqua ; columella superne anguste re- 

 flexa. 



Diam. maj. 22, min. 18 ; alt. 13 millim. 



Hob. Sumatra. Collected by Mr. Carl Bock. 



This species is readily distinguishable by the angulation of 

 the body-whorl and the excavation above it. The last whorl 

 is much impressed at the suture, forming a remarkably deep 

 canaliculation. Besides the very fine spiral strise, which 

 everywhere cover the surface, the upperside of the body- 

 whorl exhibits a number of spiral shallow sulci, which are 

 visible to the naked eye. The lines of growth are well- 

 marked, and at the suture are somewhat plicate. 



Nanina hoodjongensis. 



Testa profunda perforata, depresse globosa, mediocritar tenuis, 

 viridi-flava, fasciis duabus nigrescenti-fuscis supra medium an- 

 fract. ultimi oruata, paulo nitida ; anfractus 6, rapide accrescentes, 

 undique subspiraliter confertim corrugati, convexi, ad suturam 

 anguslissime marginati, ultimus magnus, paulo inflatus, antice 

 vix descandens, ad peripheriam porca indistincta instructus ; 

 apertura obliqua, elongato-lunata, albida superne bifasciata ; peri- 

 stoma tenue, marginibus leviter conniventibus, columellari su- 

 perne breviter raflexo. 



Diam. maj. 53, min. 42^ ; alt. 37 miUim. 



Hah. Hoodjong or Hoedjoeng, about 120 miles from the 

 southern extremity of Sumatra, at an elevation of 2000 feet. 



The single specimen of this fine species was collected at 

 the above locality by Mr. H. O. Forbes. It is as inflated as 

 N. ohliquata of Reeve (Monog. Helix, Conch. Icon. f. 384), but 

 has a more elevated conical spire ; in other respects it is alto- 

 gether different. The wrinkling of the surface is rather 

 coarse, and on the underside of the body- whorl has a distinctly 

 concentric direction. The slight ridge at the periphery falls 



9* 



