308 O. F. voii Mollendorff— T/^e Landsliells of Perak. [No. 4, 



Bnket Pondong (Dr. Townsend, Hnngerford) ; Penang {Stoliczha), 

 According to Crosse, Prof, von Martens considers this form to be a 

 simple variety of 0. cornicuhim, Mouss., of Java, whilst Stoliczka com- 

 pared it to 0. sumatrarius, Mart., of Sumatra. The descriptions of these 

 species do not, however, mention the two lines of short cilia above and 

 below the periphery (as in 0. biciliatus, Mouss.), which seems to me to 

 be a good specific character. 



CYCLOPHORIN^. 



29. Spiraculum ? regelspergeri, de Morgan, 

 de Morgan, Le Nat., vii, 1885, No. 9, p. 69 (Cyclophorus). 



" Very depressed, very widely umbilicated, 5 whorls, very finely 

 striate ; suture linear, under which there is a deep groove (" sillon") 

 covered by the margin which forming a canal along the suture is en- 

 larged towards the aperture and ends in a lamina (" lame ") which covers 

 the canal entirely and forms a tube of 4 — 5 mill, in length. Aperture 

 oblique, nearly circular, slightly reflected, near the suture winged 

 (" echancree"). Colour horny above, brown at the base, a black band 

 round the periphery, regularly arranged brown spots on the upper side 

 which give the shell the aspect of a rolled-up snake. Operculum cir- 

 cular, horny, inner side presenting a spherical depression with a promi- 

 nent nucleus in the centre, outer side helicoid (" helicoidale ") furnished 

 with very fine membranaceous lamellae destined to render the fitting of 

 the operculum more hermetic." Alt. 8, diam. maj. 25, diam. apert. 8 

 mill. 



Hab. — Environs of Lahat and Pappan, Kinta valley (/. de Mor- 

 gan), Larut (Lid. Mus.). 



I have tried to give a literal translation of de Morgan's description, 

 which certainly lacks the technical precision of a diagnosis, but at least 

 permits me to recognise his species in an immature example from Larut. 

 It is decidedly not a Cyclophorus : I considered the Larut specimen to 

 be a Pterocyclus which might, on account of the curious canaliculated 

 suture, be related to Pterocyclus albersi, Pfr. De Morgan's mention of a 

 tube and description of the operculum point to Spiraculum ; I should 

 also have thought of Bhiostoma, but there is no mention of the last 

 whorl being solute. Whether the species is really new or has to be 

 combined with a Burmese or Siamese form I cannot now decide. 



30. Spiraculum kintanum, de Morgan, 

 de Morgan, 1. c, 1885, p. 69 {Cyclophorus). 

 Kinta valley. 



