Mr. W. H. Benson on new species of Burmese Helices. 251 



5. Helix Hariola, n. s., nobis. 



Testa perforata, subturbinata, tenui, oblique striatula, striis minu- 

 tissiiiiis confertissimis spiralibus sub lente ornata, non nitente, 

 diaphaua, purpureo-cornea, strigis opacis, albis, laciniatis, fascias 

 duas latas efformantibus, picta ; spira conoidea, apice obtuso, 

 sutura impressa ; anfractibus 4^ convexiusculis, ultimo ad peri- 

 phseriam obtuse angulato ; apertura obliqua, late lunata ; peri- 

 stomate tenui, albido, margine dextro, basalique expauso, colu- 

 mellari laminam triangularem dilatatam, umbilicum subtegentem 

 efformante. 



Diam. major 15, minor 13, axis 10^ mill. Apert. 6|^ mill, longa, 

 8 lata. 



Hab. ad Thyet Myo, prope ripas Irawadi fluvii. Detexit W. Theobald. 



The interspace between the opake bands forms a dark girdle 

 below the angle^ and the periomphalus is similarly coloured. 

 The shell is more depressed in form and destitute of a keel, but 

 singularly like the rare H. Capitium, Bens., in colouring. Since 

 the discovery of the latter species by Capt. Boys, at the foot of 

 the Rajmahal Range near Sikrigali, it has not been met with by 

 any naturalist in that quarter ; but an imperfect specimen of a 

 very rare Helicc met with by Mr. Theobald in the hills above 

 Cuttack, 400 miles to the southward of its original habitat, 

 proves to be a young H. Capitium. 



6. Helix bifoveata, n. s,, nobis. 



Testa umbilicata, oblato-globosa, utrinque concava, oblique striata, 

 minutissime granulata, luteo-fusca, translucente ; spira profunde 

 exeavata, perspective umbiliciformi ; anfractibus 4^ angustis, con- 

 vexis, recedentibus, ultimo prominente, superne compresso, glo- 

 boso, cseteros occultante, subtus circa umbilicum mediocrem per- 

 spectivum compresse angulato ; apertura verticali longissima utrin- 

 que testam superante, angustissime lunata, superne et infra suban- 

 gulata; peristomate simplici, acuto, expansiusculo, marginibus 

 remotis convergentibus, columellari brevi subverticali, leviter 

 expanso. 

 Diam. major 10, minor 9, axis 6 mill. Long, apert. 7, lat. vix 2 mill. 

 Hab. ad collem Therabuin vallis Tenasserim raro. Detexit W. Theo- 

 bald. 



This is the most singular among the planorbular Helices 

 which exhibit a concavity, and, as it were, an umbilicus on the 

 spiral, as well as the basal face of the shell. The parietes of the 

 true or basal umbilicus are more vertical than those of the 

 spiral depression, and the excavation is deeper. The sculpture 

 is peculiar, consisting of lines of granules crossing each other 

 obliquely. 



The published species most nearly related to H. hifoveata are 

 H, Omicron, Pfr., //. Shuttleworthi, and //. Calculus. 



