92 LAND AND FRESHWAIER 



all have an upper inner cusp and an outer lower one. The laterals 

 are bicuspid, the outer cusp well below the inner. 



+ 45 . 2 . 12 . 1 . 12 . 2 . 45 + 

 + 59 . 1 . 59 + 



The jaw (fig. 1 c) has a central projection. 



Generative organs (figs. 1 d, \ e). The penis (fig. 1 f) consists of a 

 simple, rather short, bulbous sheath ; the vas deferens given off near 

 the summit, as is also the retractor muscle. Spermatheca mode- 

 rately long. Amatorial organ absent. 



Epeychlamts REGT7LATA, Bensou. (Plate LXXXIV. figs. 2 a-g.) 



Helix regulata, Benson, A. M. X. H. ser. 3, 1860, v. p. 383 ; Pfr. 

 Mon. Hel. vol. v. p. 125; Tryon, Man. Conch, p. 96, vol. ii. pi. 32; 

 figs. 39, 40 ; Hanley, Conch. Ind. p. 15, pi. xxxi. figs. 5, 6. 



Macrochlamgs regulata, Clessin, Nomen. Helic. p. 44. 



Original description : — " Testa vix perforata, depressa, tenui, 

 oblique obsolete striatula, titroque spiraliter elegantissime acuducto- 

 slriata, fusco-cornea, pellucida, poUtissima ; spira depresso-conoidea, 

 apice obtusiuseulo, sutura impressa siibmarginata ; anfractibus 3| 

 convexiusculis, celeriter accrescentibtts, ultimo ad peripheriam sub- 

 angulato, subtus convexiore, antice non descendente ; apertura ampla, 

 obliqiia, rotundato-lunari, peristomate recto, acuto, margine coliimel- 

 lari arcuatim descendente, superne supra perforationem reflexiuscido, 

 marginibus remotis suhconniventibns, callo tenui Junctis. 



"Diam. major 11, minor 9, axis 6 mill. 



"■ Habitat ad Kaluganga, pagi Matelle orieutalis, necnon ad 

 Katukellckande. 



" Distinct in ajjpearance from any of the known small translucent 

 Helices of Ceylon, and remarkable for the beautiful spiral impressed 

 sculpture on both sides."' 



The sculpture of the shell is shown, on fig. 2 c, near the suture. 

 Parallel regular longitudinal striation crossed by streaks of growth. 



Animal (Plate LXXXIY. figs. 2, 2 a). Foot loug behind, the lobe 

 over the mucous glaud elongate and curving over even in the spirit- 

 specimen. The shell-lobes are broad, given off from the mantle- 

 edge, and narrow gradually to a point, and would cover the greater 

 part of the shell in life. 



The male organ (fig. 2 g)is a simple long sheath, the vas deferens 

 joining it at the top with a slight swelling. The retractor muscle 

 joins above this and is very short. There is no amatorial organ ; 

 in this respect this species is closer to the Jlelicarion-like shells of 

 South India and Ceylon. 



In the odontophore (fig. 2/) the centre tooth is tricuspid, cusps 

 basal ; the median teeth with one cusp on the outer side ; nearly 

 even pointed bicus2)id laterals, becoming very minute on the margin. 

 Jaw (fig. 2 e) convex above, concave below, with a central projection. 



