AMPHIDEOMUS. 183 



Mr. Fulton states that the type of this species cannot be found 

 in the Benson collection, in the Cambridge Museum, and Prof. 

 Pilsbrj suggests that it may not have been returned by Pfeiffer 

 and is now perhaps in Dohrn's collection. As Pfeiffer, however, 

 distinctly states that the type is in the J3enson collection (Mon. 

 Helic. Viv. iii, 1853, p. 320), and as, moreover, the Benson 

 collection has experienced many vicissitudes, so that some other 

 types likewise are not traceable, the more likely explanation, in 

 my opinion, is that the shell must have gone astray. 



A. sinevsis is said to resemble A. sylheticus in the globose base 

 and groove at root of the columella, but to differ in being stouter 

 in form, two-banded below, and with a brown streak behind the 

 lip, which is said to be pale lilac. 



I possess, however, two specimens from Laos, received in 

 exchange from the Senckenberg Museum, Frankfurt a./M.', which 

 are ochreous yellow on the last whorl and bandless ; one exhibits 

 a very narro\\' dnrk brown patch occupying the groove at the root 

 of the columella and extending a short way behind the basal lip ; 

 it can also distinctly be traced beneath the parietal callus around 

 the columellar fold. This specimen has a white lip. 



Var. vicaria, Fulton. 



Buliinus sinensis, Forbes & Hanley, Conch, lud. 1870, pi. 21, 



tiga. 5, 6. 

 Amphidroinus sinensis, var. vicm-ia, Fulton, A. M. N. H. ser. 6, 



xvii, 1896, p. 80 ; Pilsbry, Man. Conch, ser. 2, xiii, 1900, p. 191 



(vicarius), pi. 62, tigs. 67-69. 



" In most collections as sinensis, from which it differs in being 

 not so broad in proportion to its length and in coloration. It is 

 broader than sylheticus, and instead of being of an uniform green 

 colour, it is yellow, with two (sometimes three) more or less 

 distinct dark brown hands encircling lower part of last whorl. 

 This variety varies a great deal in size and form. I give here the 

 dimensions of two specimens out of a series in the British Museum : 

 Long. 33 ram., maj. diani. 17 mm. ; long. 21 ram., raaj. diam. 

 14 ram." (Fulton.) 



Hah. Burma : Pegu ; Chittagong. 



With regard to its being " not so broad in proportion to its 

 length," this is a character not always to be relied upon, as I possess 

 a specimen, received from Mr. Fulton, which measures ; Long. 20, 

 diam. 12 mm. The same remark applies to its relative proportion 

 as compared with A. sylheticus, as will be seen from the following 

 observation. 



" A specimen from Chittagong (fig. 69) is more slender than 

 A. sylheticus, not ' baggy ' below, and almost white with a faint 

 ochre band above each of the purple-black ones. The apical whorls 

 are corneous-Avhite, and weakly punctate, and there is a perceptible 

 groove at the root of the columella. The peristome is pure white. 



