PSEUDOTROCHUS. 235 



or purple-black at the base of the last whorl, which is copi- 

 ously striped with ragged, opaque creamy or yellowish-white 

 stripes, this coloring also showing vividly within the mouth; 

 on the penult, whorl and the preceding one, the pattern 

 would be described as of red-brown stripes or flames on a 

 whitish ground. The sutural margin is very narrow, though 

 distinct It commonly measures 32 to 33 mm. long, 18 wide. 

 The dark coloring is sometimes wanting, as in a pale speci- 

 men (fig. 56), figured by Pfeiffer from Dohrn's collection. 



18. P. GOULDII (Reeve). PI. 15, figs. 57, 58, 59. 



Shell imperforate, thin, ovate-conic, with teat-like apex 

 and subangular or angular periphery; whitish or reddish 

 under a thin yellow cuticle, which is marked with whitish, 

 hydrophanous lacerated stripes on the upper post-embryonic 

 whorls of the spire, and a belt of similar square spots below 

 the peripheral angle, which is marked with a narrow red- 

 dish belt. Surface hardly shining, with low growth-wrinkles 

 and fine, faint spiral striae. Whorls 7, moderately convex. 

 Aperture oblique, ovate, pale livid- whitish inside; outer lip 

 acute; columella very narrow, thin, obliquely subtruncate 

 below. Length 48-49, diam. 23-24 mm. 



West Africa: Liberia (Dr. Perkins). 



Acliatina gouldii REEVE, Conch. Icon., v, pi. 23, f. 128 

 (March, 1850). Acliatina balteata OLD., Proc. Boston Soc. 

 N. II., iii, p. 195 (April, 1850). PFR., Monogr., iii, p. 480 

 Perideris baltcata PFR., Monogr., iv, p. 593 ; vi, 204. KOBELT, 

 Conchyl. Cab., p. 34, pi. 10, f. 4, 5; pi. 16, f. 2, 3. Not 

 Acliatina lalteata Reeve, 1849. 



Remarkable for its belt and flames of hydrophanous, whit- 

 ish cuticle ; but the latter is easily rubbed off. 



19. P. SAULCYDI (Joannis). PI. 11, fig. 20. 



Shell quite solid, ovoid, the spire much swollen and notice- 

 ably girdled at the suture; the first whorls teat-like. The 

 last whorl is as large as all the rest together. Surface rough- 

 ened by quite irregular strife of growth. Two distinct de- 

 scending grooves on the lower part of the belly of the shell, 



