. NOTE ON GORILLA ERRONELLA, NEV., MS. 



Hy g. k. gude, f.z.s. 



The collection of the lale Hugh Nevil!, which came under the hninmer at 

 Stevens' Sale Rooms on the loth of May last, contained a number of shells 

 of C'ori//a, which, at first, I was inclined to regard as a new species. 



The lot was acquired hy Mr. H. B. Preston, who kindly placed several 

 of the specimens at my disposal and upon closer examination the shell in 

 question appears to he identical with one which Colonel Beddome received 

 years ago with the manuscript name Helix eironeUa, Nev., Ceylon, and which 

 I figured and named provisionally Corilla erronea, var. erroneVa (Science 

 Gossip, (N.S.) Ill, (1896) p. 127, fig. 16.) The large amount of material 

 now at command enables one to form a more accurate estimate as to its rank, 

 and in view of the constant and considerable dififerences both in the ordinary 

 shell characters and in the armature, I have no hesitation in according it 

 specific rank. Unfortunately no record of the precise habitat has been found, 

 but there can be no doubt that the shells were collected in Ceylon. 



I am now in a position correctly to define the species and to illustrate 

 the armature more fully from specimens opened for that purpose. 



Copilla erronella, Nev., MS. 

 Shell discoid, elliptic, widely umbilicated, dark corneous, or chestnut : a little 

 shining above, polished below, finely and regularly ribbed; spire plane, suture 



impressed; whorls a,\ to 4^, slightly flattened above, rounded at the perij)hery, 

 tumid below, increasing sFowly at first, the last suddenly widening and dilated 

 at the aperture, deflected in front, constricted behind the peristt/me ; nepionic 

 whorls (4) almost smooth. Aperture nearly horizontal, ovate-obcordate, 

 margins distant, united by a sinuous fold on the parietal wall. Peristome 

 fuscous or pinkish, thickened and well reflexed ; upper margin very shortly 

 ascending at first, then descending, with a more or less strong inward inflec- 

 tion ; outer margin curved, lower margin with a strong oblong tubercular 

 tooth. Parietal armature consisting of three elongated curved folds : the 



