Mr. W. Clark on the Lepton sulcatulum. 27 



Sophina forahilis, B. (char, emend.). 



Testa subanguste et profunda umbilicata, conoideo-semiglobosa, 

 teniii, oblique striatula, spiraliter confertissime striata, cornea; 

 spira depresso-conoidea, apice elevatiusculo, obtuso, sutura im- 

 pressa ; anfractibus 6 convexiusciilis, ultimo nou dcscendente, ad 

 ambitum rotundato, circa umbilicum perspectivum intus spiraliter 

 striatum carinato, carina spirali, intrante ; apertura obliqua, ro- 

 tuudato-luuata, peristomatc recto, acuto, margine columellari 

 oblique recurAatim dcscendente, crassiusculo, subcrenulato, cum 

 basaii angulum fere rectum, arete rimatum, efformante, rima ex- 

 tremitatem carinse umbilicalis incidente. 



Diam. major 6-8, minor i>^7i axis 3-4 mill. 



Habitat ad Pbai-Than vallis Tenasserim, et ad Cavernam Damathd 

 prope Moulmein. 

 Syn. Helix forabilis, Benson, Ann. Nat. Hist. ser. 3. vol. iii. 



p. 389. Sect. Sojihina, p. 4/3. 



The three species already known inhabit the vicinity of Moul- 

 mein ; only one of them has also been found elsewhere. The 

 third and largest (-S'. schistostelis,^.) was sufficiently described, in 

 the paper last quoted, as a Helix of the section now treated as 

 a distinct genus. It appears to be scarcely within the bounds 

 of probability that a form so pccidiar should be confined to the 

 limited tract in which it has hithci'to been collected. Species 

 ma\' liave been overlooked, or regarded by persons unacquainted 

 with the subject as merely broken shells, both iu the ]\lalay 

 peninsula and in Siam, — possibly even in Cochin China. Other 

 unusual Tenasserim types have occurred in the two countries 

 last named. 



Cheltenham, Dec. 3, 1859. 



Note. — I have employed the terms " bathrommatous " and 

 " acrommatous " as expressive of certain characters iu the ani- 

 mals of shells, and saving recourse to unnecessary details, thereby 

 filling a void in conchological nomenclature. The former word 

 has reference to genera in which tlie eyes are situated at the 

 base of the tentacula, the latter to those in which they arc 

 placed at tlie summit. 



IV. — On the Lepton sulcatulum o/Mr. Gwyn Jeflfreys. 

 By William Clark, Esq. 



To the Editors of the Annals of Natural History. 

 Gentlemen, Bath, 21st November, 1859. 



It is very desirable to correct the eiTors of science without 

 delay; I therefore venture to request the insertion of a short 

 paper iu your excellent Journal. 



