BOYSIDIA. 199 



India: Landour, type loc., figs. 1, 2, 4, and Mussoorie (Ben- 

 son) ; Cherra Poonjee, Assam (Godwin-Austen). 



China: Hangchow, prov. Chekiang (Hirase), fig. 3. 



Japan: Suimura, Awa (Shikoku) ; Riozen, Omi; Yoro, 

 Mino, figs. 9, 10. 



Pupa plicidens BENS., Ann. and Mag. N. H. (2), iv, 1849, 

 p. 126. PPR., Monogr., iii, 553. KUESTER, Syst. Conchyl. 

 Cab., Pupa, p. 136, pi. 17, f . 23, 24.Boysidia plicidens Bens., 

 GUDE, Fauna of Brit. India, Moll., ii, p. 294. ? ? Hydrocena 

 milium Bens., GODWIN-AUSTEN, P. Z. S., 1872, p. 515, pi. 30, 

 f. 3. 



This species is easily known by the numerous lamellae and 

 plicae, most of them terminating outwardly in acute hooks. 

 The interruption of the angular lamella is also a special fea- 

 ture. Although common, the species has not been accurately 

 described or figured hitherto. 



The shell is narrowly perforate, becoming openly rimate in 

 the last half-whorl. It is most minutely, densely granulose, 

 with very few widely-spaced growth-lines, and of a light 

 brown tint. The lip expands very little, but there is a depres- 

 sion behind it preceded by a low crest. Except in the sinulus, 

 the peristome has a callous rim within, and there is a rounded 

 tooth at the upper third of the outer lip, sometimes doubled. 



The parietal wall (pi. 34, fig. 10) has more lamellae than any 

 other species of the genus. The angular lamella is twice as 

 long as the parietal. Deep within, it forms a hook, then be- 

 comes reduced to a mere thread, and then enlarges again, to 

 form a stout lamella which emerges to the lip-edge. There are 

 two small, immersed lamellae, both hooked in front, between 

 the angular and the outer suture, shown in fig. 10. The pari- 

 etal lamella is short and thick, terminating forward in a hook. 

 Infraparietal is much smaller, also hooked. 



The columellar lamella is short, horizontal and hooked, as 

 are the small supra- and sub-columellar lamellae. These are 

 shown in profile at the left side of fig. 10, as well as in the 

 face views. 



The upper and lower palatal plicae are readily distinguish- 

 able by their larger size. There are two small basal plicae (or 



