PSEUDOTROCHUS. 233 



PFR., Monogr., iv, 595; vi, 204. SHUTTLW., Notitiae, i, p. 

 81. DOHRN in Pfr., Novit. Conch., iv, p. 163, pi. 137, f. 5, 

 6, and young, f. 7. v. MART., Monatsber. Nat. Fr. Berlin, 

 1876, p. 259. KOBELT, Conchyl. Cab., p. 37, pi. 11, f. 1-4; 

 pi. 14, f. 6; D'AILLY, Bihang, p. 83, pi. 5, f. 3, 4. SCHAKO 

 in Furtado, Journ. de Conch., 1888, p. 8, pi. 3, f. 1-7 (jaw 

 and teeth). Achatiha vignoni MORELET, Journ. de Conchyl., 

 1860, p. 189. MARTENS, Malak. BL, 1866, p. 107, pi. 4, f ." 9. 



In typical auripigmentum (figs. 11, 14) the ground-color 

 is a rich brownish-yellow, paler on the spire. There is a 

 deep chestnut belt below and at the periphery, regularly in- 

 terrupted upon the latter by opaque white spots, which coal- 

 esce to form a white belt at the angle. The spire is irreg- 

 ularly maculate and flamed with white and chestnut. Fig. 

 11 (from Reeve) represents the adult, fig. 14 a half -grown 

 specimen. Fig. 13, from the Novitates Conchologicce is also 

 nearly typical. In fig. 12 a specimen is drawn, in which the 

 peripheral chestnut markings are much reduced, and the 

 opaque-white patches stand on a gray- white ground, the spire 

 being gray-white above. A form in which the dark markings 

 predominate is shown in fig. 15, copied from Kobelt. 



D'Ailly had four Kamerun specimens in which the chest- 

 nut flames extended to the suture above, and there was no 

 white peripheral girdle (fig. 16). 



The variety vignoni Morel, (pi. 10, fig. 17) is somewhat 

 similar in its many, continuous dark stripes, but the latter 

 continue to the axis below, there being no light basal area, 

 such as all the preceding shells have. It is not merely the 

 young of auripigmentum; but the definition of subspecies 

 awaits the collection of larger series and a knowledge of 

 their distribution. The jaw and teeth have been figured by 

 Schako. 



16. P. LECHATELIERI (Dautzenberg) . PL 10, figs. 18, 19. 



Imp erf or ate, oblong- turrite, rather solid, a little shining. 

 Spire conoid, the apex attenuate; obliquely striatulate. 

 Whorls 7-8, a little convex, swollen above, suture linear, not 

 margined ; last whorl encircled at the periphery with a prom- 



