370 PROCEEDINGS OF THE MALACOLOGICAL SOCIETr. 



prominens, antice tuberculis 2-3 inconspicuis iuterdum instructa. 

 Long. 25, diam. 12 mm. ; apertura cum canali, 14 mm. longa, 4-75 lata. 



Operculum fuscum, breviter unguiformis, nucleo extremitatem 

 versus acuminatam, autem haud apicali. LineiB incrementi extra 

 tenues, nucleum versus confusse. Superficies inferior densatione 

 Isevi margini exeurvo parallela, instructa. Reliquiae superficei rugosge, 

 porcis transversis paucis subvalidis instructse. 



This species has in some respects the general features of S. spinosiim, 

 H. & A. Adams. ^ It differs, however, in the number of rows of 

 spines on the body- whorl. The spines are hollow and pale, and not 

 dark- coloured, the anterior canal is more contracted, and the colour 

 of the aperture is more intensely rosy purple. 



The spines of the second series from the suture are the longest 

 and consequently most conspicuous. There is one series above these 

 and usually three below, besides the squamate ridge around the 

 rimation, which is of a rosy-red colour, quite different from the 

 general pale-violet ground-colour of the shell. The spiral lirae 

 covering the entire surface are more or less developed into short 

 prickles upon the costae. The latter are usually nine in number 

 upon the body-whorl. 



Plesiotkochtjs Fischeri, n.sp. 



Testa parva, trochiformis, in medio carinata, angustissime rimata, 

 alba ; spira conica, pagodiformis ; anfractus 7 declives, plani, infra 

 fortiter carinati, undique spiraliter striati, ultimus ad peripheriam 

 acute angulatus, infra concentrice striatus, porcis duobus rotundatis 

 instructus, una mediana, altera paulo majori circa rimam sita ; apertura 

 irregulariter quadrangularis, alba, antice brevissime canaliculata ; 

 columella arcuata, callo albo, Isevi, reflexo induta, antice obscure 

 subtruncata ; labrum tenue, in medio parum productum. Long. 4, 

 diam. 2-5 mm.; apertura, 1-5 longa, 1-25 lata. 



This species resembles P. Souverlianus, Fischer, the type of the 

 genus, in form, although perhaps a little higher in proportion to 

 the width. It differs, however, in being minutely riraate, and in 

 the swollen ridge around the perforation. Upon the body-whorl 

 between the peripheral keel and the median ridge are three fine lirse, 

 of which that close to the keel is the thickest. Between the median 

 ridge and the umbilical ridge is a single fine lira. 



^ Reeve, Couch. Icon., vol. iii, Ricinula, fig. V2b. 



