PA.LUDOMUS. 55 



tudinaliter subobscure sulcato-striata, spira brevi ; anfractibus 

 convexis superne subdepressis, et minute spiraliter sulcatis, 

 olivaceo-fusca, nigricante obscure bifasciata ; apertura albida. 



The dimensions according to the figure in the ' Corichologia 

 Indica ' are as follows : 



Alt. 17'5, diain. 14 mm. 



Hob. Mountain streams of Ceylon. 



" Allied to P. decussata, but of more acuminated growth." 



103. Paludomus (Philopotamis) rupaeformis (Brot). 



Paludomus (Philopotamis) rupceformis (Brot), Concli.-Cab. ii, 

 p. 30, 1880, pi. 5, fig. 10 ; Nevill, Hand List, pt. 2, p. 298. 



Original description : Testa globoso-mucronata, solidula, corneo- 

 olivacea, nigro inquinata, unicolor. Spira subintegra, parvula, 

 breviter concavo-mucronata ; anfr. 6 (integra3 ad 7) convexi, 

 sutura distincta divisi, laevigati, lente crescentes ; ultimus subito 

 inflatus, globosus, sublaBvigatus vel striis incrementi tenuibus vix 

 striatulus. Apertura ovata, superne acuminata, basi rotundata, 

 intus alba, vel pallide late bifasciata ; coluinella arcuata, crassi- 

 uscula. Operculum typicum. 



Alt. 16, diam. 12 mm. 



Aperture : alt. 10-5, dium. 6 mm. 



Hob. Matale, Ceylon (Layard). 



104. Paludomus (Philopotamis) regalis, Layard. 



Paludomus (Philopotamis) reyaiis, Layard, P. Z. S. 1854, p. 93 ; 

 H. &T., C. I. pi. 121, fig. 10. 



Original description : Shell oblong ovate ; axis 1 inch, diam. 

 9 lines. Spire exserted, short. Whorls rounded, depressed at 

 the upper part, spirally corded with close-set slight ridges, longi- 

 tudinally minutely striated, and crowned with a single row of 

 short, sharp, hollow, angular spines, closely set. Colour yellowish- 

 olive, painted with wavy, dark brown longitudinal lines. Aperture 

 pure white. 



Operculum unknown, but most probably as in P. sulcata. 



Hob, Stream in the Cnia Corle, Western Province, Ceylon. 



105. Paludomus (Philopotamis) nigricans (Reeve), 



Paludomus (Philopotamis) nigricans (Reeve), Con. Icon., Palud. 

 sp.6; H. & T., C. I. pi. 124, fig. 1. 



Original description: Shell ovate, spire rather prominent, ex- 

 serted ; whorls smooth, faintly angled towards the base; blackish, 

 interior bluish white. 



Alt. 1375, diam. 9*25 mm. (taken from fig. in Conch. Icon.). 



ffab. Ceylon (in mountain streams at 6,000 feet elevation). 



