234 PSEUDOTROCHUS. 



inent carina. Aperture quadrate, about three-eighths the 

 total length, the margins joined by a callous. Columella cal- 

 lous, vertical, somewhat twisted, lip acute. Color livid-testa- 

 ceous, irregularly marked with longitudinal blackish and 

 whitish flames and brown dots. Length 62, diam. 27, apert. 

 23 mm. (Dautz.). 



West Africa: Dahomey, near Affame, on the Oueme river 

 (Capt. Le Chatelier). 



Perideris lechatelieri DAUTZ., Journ. de Conchyl., xl, 1892, 

 p. 297; xli, 1893, p. 33, pi. 1, f. 3. KOBELT, C. Cab., p. 39, 

 pi. 13, f. 3, 4. 



Closely related to P. auripigmentum, from which it differs 

 by the carinate periphery and swollen whorls. Described 

 from a single specimen. 



17. P. MUCIDUS (Gould). PL 15, figs. 54, 55, 56. 



Shell rather solid, ovate, mamillate, indented, granulose- 

 striate; yellow, longitudinally ornamented with interrupted 

 black streaks; spire oval; whorls 6, the upper ventricose, the 

 last abnormal, contracted; suture margined and crenulate. 

 Aperture small, rounded-lunate; lip acute, pale; columella 

 subtruncate; throat variegated black and buff. Length one 

 and three-eighths, width three-fourths inch (Old.). 



West Africa: Interior of Liberia (Dr. Perkins). 



Bulimus mucidus GLD., Proc. Bost. Soc. N. H., iii, p. 194 

 (April, 1850) ; Otia, p. 207. AcJiatina mucida Gld., REEVE, 

 Conch. Icon., v, pi. 23, f. 126. Pfr. in Conch. Cab., p. 339, 

 pi. 37, f. 8, 9; Monogr., iii, p. 481. Perideris mucida Gld., 

 SHUTTLW., Notitiae, i, p. 83. PFR., Monogr., iv, 596 ; vi, 203 ; 

 viii, 267. DOHRN, Malak. BL, xxii, 1875, p. 206 (variations). 

 -KOBELT, Conch. Cab., p. 36, pi. 10, f. 8, 9. 



The specimens I have seen, two of which are shown in figs. 

 54, 55, are rather thin, and the last whorl is not abnormally 

 contracted, but otherwise they agree with Gould's descrip- 

 tion. The surface is very finely plicatulate, cut into weak 

 granules by fine spiral incised striae; and it is also indis- 

 tinctly, coarsely malleate. The ground-color is whitish at the 

 apex, becoming red-brown on the penult, whorl and black 



