r. W. Clark on the Lepton sulcatulum. 27 



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



Testa subanguste et profunde umbilicata, conoideo-semiglobosa, 

 tenui, oblique striatula, spiraliter confertissime striata, cornea; 

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

 pressa ; anfractibus 6 convexiusculis, ultimo non descendente, ad 

 ambitum rotundato, circa umbilicum perspectivum intus spiraliter 

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

 tundato-lunata, peristomate recto, acuto, margine columellari 

 oblique recurvatim descendente, crassiusculo, subcrenulato, cum 

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

 tremitatem carinse umbilicalis incidente. 



Diam. major 6-8, minor 5^-7, axis 3-4 mill. 



Habitat ad Phai-Than vallis Tenasserim, et ad Cavernam Damatha" 

 prope Moulmein. 

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



p. 389. Sect. Sophina, p. 473. 



The three species already known inhabit the vicinity of Moul- 

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

 third and largest ($. schistosteliSjB.) was sufficiently described, in 

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

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

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

 limited tract in which it has hitherto been collected. Species 

 may have been overlooked, or regarded by persons unacquainted 

 with the subject as merely broken shells, both in the Malay 

 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 

 t{ acrommatous " as expressive of certain characters in 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 the eyes are situated at the 

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

 placed at the summit. 



IV. On the Lepton sulcatulum o/Mr. Gwyn Jeffreys. 

 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 errors of science without 

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

 paper in your excellent Journal. 



