230 PSEUDOTROCHUS. 



above, the apex obtusely papillar. Whorls iy 2 , moderately 

 convex, the last nearly two-fifths the total length obtusely 

 subangular; suture crenulate; columella vertical, involute, 

 slightly truncate basally. Aperture suboval, the peristome 

 acute. Length 58-62, diam. 24-48, apert. 24-26 mm. long 

 (ShuttL). 



West Africa: Grand Bassam (Verreaux). 



Perideris incolorata SHUTTL., Notitise, i, p. 81, pi. 2, f. 4, 

 5. PFR., Monogr., iv, p. 594; vi, 204. KOBELT, C. Cab., p. 

 44, pi. 15, f. 2-5. 



Belated to P. onager in form and solidity of the shell. 

 It seems also not very unlike P. reeveanus. I have not seen 

 specimens. Figs. 45-47 are copied from Shuttleworth ; fig. 

 43 from Kobelt. 



12. P. IOLARYNX (Shuttleworth). PL 9, figs. 8, 9, 10. 

 Shell long ovate, slightly striatulate, glossy; under a very 



thin corneous cuticle it is whitish-ashy, ornamented with 

 narrow, irregular streaks, spots and dots of reddish-purple. 

 Spire conic above, the apex obtusely papillar; whorls T 1 /^, 

 slightly convex, the last flattened, obsoletely angular, two- 

 fifths the total length; the columellar region white. Suture 

 narrowly margined, crenulate. Columella subarcuate, a little 

 thickened, truncate at the base, outwardly pale, inwardly 

 deep violet-margined. Aperture suboval, violaceous inside, 

 opalescent; peristome acute, pale. Length 62, diam. 28, 

 apert. 25 mm. (Shutthv.). 



West Africa: Grand Bassam (Verreaux). 



Perideris iolarynx SH., Notitiae Malacologies, i, p. 80, pi. 

 2, f. 1 (1856). PFR., Monogr., iv, 594; vi, 204. KOBELT, 

 Conchyl. Cab., p. 45, pi. 15, f. 6, 7. 



A beautiful species, related to the following. Fig. 10 is 

 a copy of Shuttleworth 's. 



13. P. ONAGER (Shuttleworth). PL 13, figs. 40, 41, 42. 

 Shell lengthened-oblong, rather solid, striatulate, a little 



glossy; under a very fugacious pale straw-colored epidermis 

 it is whitish, closely ornamented with narrow, frequently 



