Mr. W. II. Benson on new species of Burmese Helices. 249 



cleus subdivided into spherical granules of refractive matter, still 

 circumscribed by their proper membrane within the capsule ; 

 (e) nucleolus within this proper capsule which sometimes appears 

 as a disk of protoplasm, at others as an oil-globule, and at others 

 in a state of minute granulation. 



Fl^. 95. Nucleus of Actinophrys oculata after Stein (tab. 5. figs. 25-28. 

 op. cit.), to compare with the nucleus and plasmic zone just de- 

 scribed : (a) " Marksubstanz ;" (6) " nucleus." 



Fig. 96. Rhizopodous cell of Characeae under arrest (?) of generative deve- 

 lopment : (a) plasmic zone reduced to a membranous (?) state 

 and presenting a number of pouches on its surface ; {b) granules 

 still within the capsule of the nucleus. 



Fig. 97. Ditto, with capsule of the nucleus empty, and its refractive gra- 

 nules in the pouches of the mulberry-shaped plasmic membrane. 



Fig. 98. The mulberry-shaped plasmic membrane, &c. of the foregoing 

 fifjure isolated. 



XXII. — Descriptions of one Indian and nine new Burmese 

 Helices; and Notes on two Burmese Cyclostomacea. By 

 W. H. Benson, Esq. 



1. Helix pylaictty n. s., nobis. 



Testa obtecte perforata vel imperforata, depresso-eonoidea, solidi- 

 uscula, nitente, superne radiato-costulata, subtus laiviori, costulis 

 evanescentibus, cornea, spira depressa, apice obtuse, sutura im- 

 pressa ; anfractibus Q\ lente accrescentibus, angustis, ultimo antice 

 vix descendente, subtus convexo, ad periomphalum excavato ; 

 apertura transversa, angusta, lunato-lineari dente unica elongata 

 parietali, lamelliformi, alba, coarctata ; peristomate incrassato, ob- 

 tuso, edentulo, albo, intus strictiusculo, margine externo infra an- 

 gulum periphserii sinuato. 



Diam. major 9, minor 8, axis .5 mill. 



Hab. ad Maulmain. Teste W. Theobald. 



This and the following shells were collected by Mr. W. Theo- 

 bald, jun. It presents a singular resemblance to the North 

 American H. hirsuta. Say, in the form of the aperture and the 

 structure of the parietal plait ; but there is no disposition to 

 form teeth on the basal callus as in that shell. It must be in- 

 cluded in the division Tridopsis of Beck, of which H. hirsuta 

 and the Burmese H. infrendens, Gould, form a part. A still 

 nearer approach to the latter species will be found below in 

 H. capessens. 



2. Helix artificiosttj n. s., nobis. 



Testa anguste umbilicata, orbiculata, discoidea, nitidiuscula, superne 

 liris confertis sulcisque profundis spiralibus, costulisque confertis 

 obliquis decussata, subtus liris remotioribus striisque radiatis ornata, 

 pallide cornea, spira planulata, interdum omnino planata, apice vix 



