100 LAND ANB FRESHWATER 



EupLECTA PR.iJEMiNENs, E. R. Sykes. (Plate LXXXVl. figs. 1-7.) 



Sykes, Proc. Malacol. Soc. vol. iii. no. 2, p. 71, July 1898, pi. v. 

 figs. 5, 6 (shell). 



Original description : — " Testa subperforata, depresso-conoiden, 

 tenuiuscula, superne conferiim costulata, lineis impressis spiralihua 

 requlariter granulata, conieo-brunnea, versus apicem lineis spiraUbus 

 vaUdioribus quam costidis sculpta ; spira concava, apice elevato, 

 acuto ; anfr. 6-6 1, plano-convexi, mediocriter accrescentes, idtimus 

 non descendetis, acute carinatus, basi convexus, radiatim striatulus, 

 nitidus ; apertura obliqua, angulato-lunaris ; peristoma simplex, 

 rectum, margine columellari ad perforationem subreflexo. 



" Alt. 15 : diam. max. 25*5 mill. 



" Hab. Watawala, Ceylon (Collett). 



" This is the Helix acuducta, Benson, of Mr. Collett, in his 

 interesting paper * on the land-shells of Ambagamuwa. From 

 an examination of Benson's specimen, preserved at Cambridge, 

 which agrees fairly well with his original description, I arrive at 

 the folloAving differences : — H. acuducta is slightly lighter in colour, 

 does not possess the drawn-out apex, the whorls do not increase so 

 rapidly, the sculpture is not so strong, the protoconch is nearly 

 smooth, and only shows the spiral lines very indistinctly. To sum 

 up, the true H. acuducta is a shell in form, etc., rather of the group 

 of E isabellina, Pfr., and E. colhtti, Sykes. 



" The shell figured in the Conch. Ind. (pi. 1. fig. 5) is very 

 probably the present species. Another specimen, measured in a 

 similar manner, gives alt. 14*5, diam. max. '25 mm. ; it is slightly 

 darker, and the spiral lines being weaker, does not appear so 

 granular : this smaller shell is the one figured, the larger specimen 

 having met with an accident." 



Animal (Plate LXXXVl. fig. 1), from the Binoya Estate (Collett). 

 There is a minute right shell-lobe (fig. 2), but no left shell-lobe. 

 The right dorsal lobe is moderately large, the left is in two distinct 

 parts, the posterior lobe long and narrow. 



The jaw (fig. 5) has a central projection on a strongly concave 

 edge. The arrangement of teeth in the row is : — 



54 . 1 . 21 . 1 . 21 . 1 . 54 

 76 . 1 . 76 



Central (figs. 6-6 b) with a long point ; median with cusp on outer 

 side ; laterals, outer point below the inner. 



The generative organs (figs. 4-4 c) are interesting. 



The penis-sheath is doubled back into a loop, which is held 

 together by a very muscular band ; it then gives off" a branch to the 

 retractor muscle and to another twdsted short portion the vas 

 deferens is united. When the band of muscle is severed across 

 and the whole extended from the retractor muscle, it has an 



* Joura. Roy. As. Soc. (Ceylon Branch"), vol. xv. 



