ACM ELLA. ^^^ 



AcmcUa (s. s.) roepstorfnna, Kobelt & Miilleiidorff Nachv. Deuts. 

 Malak. Ges. xxx, 1898, p. 15;5 ; id., Cal. rneum. 1899, p. /d. 



Ori<jinal dcscrijjtion :— " Shell not quite so large as the preceding 

 [.4. tersa and A. liyalina], \vith less convex whorls, less globose 

 last \v horl, and less open umhilicus ; in these respects it is nearer 

 A. Jiyalina ; the last whorl is, however, more produced and con- 

 tracted than in .1 . hyalhia. The sculpture difters altogether from 

 that of the other described species of the genus ; it is throughout 

 regularly, closely, evenly striated, the striae lucised and obhque- 

 excavated at the suture. 



" Long. Ik ; diain. 1 mill." 



Hah. Nicobar Is. : Katchall {StoIizcJca). 



"The shell is of a silkv, translucent and shniing texture, with 

 5 almost cylindrically tiirreted whorls, the last a trifle compressed 

 at the periphery ; the umbilicus is exceedingly narrow and partially 

 overlapped by* the thickened peristome, which here and there, 

 under the lens, clearly shows a duplex character; the aperture is 

 very small, unusually broad in proportion to its height, and 

 almost circular, ^^■ith the margins almost but not quite con- 

 tinuous." (Nevill.) 



561. Acmella tersa, Benson. 



Cijclostoma tersum, Benson, A.M. N.H. ser. 2, xi, J 853 p. 285. 

 Ci/clostovws terms, Pfeiffer, Malak. Blatt. i, 1854, p. 9:}; Adams, 



Gen. Eec. Moll ii, 1856, p. 291. ..,-,_, ,., , 



Hydrocena tersa, Benson, A. M. N. TI. ser. 2, xyii l8o6, p. 2o2 ; 



■pfeiffer, Mon. Pueum. Suppl. 1, 1858, p. 158; id., op. cit. 



Siippl. 2, 1865, p. 172. ^ ... 



Acicnin {Acmella) term, Blaiiford, A.M.^.H. ser. 4, in, lbb9. 



p. 178, pi. 16, fig. 2. ^ ,. ^^^^ „.,., 



Acmella tersa, Theobald & Stoliczka, J. A. 8. B. xli, 18. 2, p 333 ; 



Theobald, Cat. Shells Bnt. India, 1876, p. lo ; Hanley & 



Theobald, Conch. Ind. 1875, pi. 117, fig. 1 ; Nevill, Hand List, i, 



1878, p. 251. 

 Georissa tersa, Pfeiffer, Mou. Pneum. Suppl. 3, 1n6, p. J9l. 

 Acmella (s. s.) tersa, Kobelt & Mcillendorff, Nachr. Dents. Malak, 



Ges. xxx, 1898, p. 153 ; id., Cat. Pneum. 1899, p. 73. 



Original description:— "Tes\a subperforata, miriuta,ovato-conica, 

 albida, longitudinaliter (radiatim) sub lente striis exihssimis 

 eleganter insculpta; sutura impressa, apice obtusiusculo ; antrac- 

 tibus 5 couvexis ; apertura angulato-ovata, verticali, tertiam partem 

 testjB ^quante; peristoniate simphci, crassiusculo, margiuibus 

 callo tenui junctis. 



" Diam. 1, long. 2 mill." (Benson.) 



Bab. India: Musmai, near Cherrapoonjee, Khasi Hills, Assam. 



This species and A. milium were found by Bensoii m moss. 



