of the Genera Helix, Clausilia, and Spiraxis. 89 



4. Helix hyptiocyclos, B., n. sp. 



H. testa latissime umbilicata, orbiculato-planata, planorbiformi, de- 

 pressa, fragili, oblique striatula, translucente, polita, olivaceo- 

 cornea ; spira concaviuscula, apice foveolato, suturis profundis ; 

 anfractibus 4|, gradatim iucrescentibus, utrinque convexis, ultimo 

 convexiusculo, peripheria subcarinata ; apertura valde obliqua, 

 elliptico-lunata ; peristomate tenui, acute, marginibus conniventi- 

 bus, callo tenui junctis. 



Diam. major 6, minor 5, alt. Ij mill. 



Habitat sub stercore bovillo ad latera coUium prope Fort M'Donald, 

 teste F, Layard. 



This little shell resembles a Planorbis more closely than any 

 known species of Helix. The specimens were taken in a living 

 state, and it is a matter for regret that the tentacula and eyes 

 were not examined and recorded at the time of capture. Mr. 

 Layard, however, states that, when placed under a glass, the 

 animals crept briskly on the interior surface, a fact which inva- 

 lidates the idea of the shell being possibly a Planorbis. It 

 occurred on a flat space on the side of the hills where a clearing 

 had been made for cultivation, and where no water lay. The 

 habits of the little Rohilkund Planorbis rotula, m., the temporary 

 inhabitant of a precarious pool, may be compared with those of 

 Helix hyptiocyclos, by referring to the 'Annals of Natural His- 

 tory 'for May 1850. 



The Himalayan Helix Huttoni, Pfr., which was detected by 

 the Messrs. Blanford on the northern face of the Nilgiri range, 

 in Southern India, reappears in the central mountain-group of 

 Ceylon, where Mr. F. Layard took it near Fort M'Donald. 



5. Clausilia Ceylanica, B., n. sp. 



C. testa vix rimata, fusiformi, oblique confertissime eostulata, costulis 

 nonnullis undulatis, fuscescenti-olivacea; spira gradatim attenuata, 

 lateribus convexiusculis, apice obtusiusculo, sutura impressa ; an- 

 fractibus 8, convexiusculis, ultimo ad basin rotundato ; apertura 

 subobliqua, pyriformi, lamellis contiguis, inferiore valde exserta, 

 torta, piicis palatalibus 2, subsequalibus, elongatis, columellari im- 

 mersa ; peristomate continuo, superne soluto, undique subexpansp, 

 reflexiusculo. 



Long. 12, diam. 2\ mill. ; apert. long. 3, lat. 2 mill. 



Habitat prope Fort M 'Donald. 



Found by Mr. F. Layard at an altitude of 4500 feet on the 

 central mountain mass of the Island of Ceylon. Its nearest 

 Indian ally in form is the Darjiling C. los, from which it may 

 at once be distinguished by its sculpture, teeth, and internal 

 plicae. This is the first species of the genus which has been 

 found in Ceylon. No representative has yet occurred in Southern 

 or Central India. 



Ann. If Mag. N. Hist. Ser. 3. Vol. xi. 7 



