CAM^NA. 101 



Genus CAM^ENA (Alb.) Pils. & v. Moll. 



Camcena ALBERS, Die Heliceen p. 85, 1850, in part. Camena 

 Alb., v. MARTENS, Die Hel. 2d. edit., p. 165, type cicatricosa Mull, 

 (restricted to sinistral species of Cam sen a and Euhadra). Camcena 

 Alb., PILSBRY, Man. of Conch, vi, p. 197, and viii, 265. v. MOLL- 

 ENDORFF, Nactirichtsbl. d. D. M. Gesellsch. 1891, p. 195. PILSBRY, 

 /. c., 1892, p. 71 ; Proc. Acad. Nat. Sci. Phila., 1892, p. 398 (anat- 

 omy). Eucochlias THEOB. in NevilPs Handlist Moll. Ind. Mus. pt. 

 1, p. 81, 1878 (type, ochthoplax; contains also bougainvillei, illustris 

 sulcocincta and pyrostoma) . 



-}-Pseudobba v. Moell. and Phcenicobius Morch. 



Shell rather large, varying from depressed-globose or conoidal to 

 elevated and short pupiform ; dextral or sinistral, solid, yellow or 

 brown usually encircled by chestnut bands or lines. Surface closely 

 malleated or wrinkled all over ; whorls about 5-5|, the upper ones 

 flattened, the last subglobose or carinated ; peristome expanded or 

 reflexed, its ends not converging, columellar margin dilated over or 

 partly over the rather narrow umbilicus. The columella is rounded. 

 The nuclear shell is rather large, (about one-fifth the diameter of the 

 shell), consisting of 2 to 2J whorls, its junction with the after-growth 

 marked by a (generally) distinct line. The young shells are acutely 

 carinated. Type cicatricosa Mull., pi. 19, fig. 8. 



Animal having the soleven/ indistinctly tripartite ; lateral edges of 

 foot with no trace of a foot-margin, sides of foot granulated in irregular 

 pattern, the tail rather long, rounded above, with an indistinct slightly 

 impressed longitudinal median line ; anteriorly there are a few indis- 

 tinct longitudinal grooves from mantle to head. Mantle-margin 

 with a small triangular right body-lappet, and a longer left one. 



Jaw arcuate, strong, typically with numerous strong, separated 

 ribs (pi. 18, -fig. 5). 



Dentition : Central and lateral teeth having the mesocones only 

 developed, the cusps large, cutting-points small (pi. 18, fig. 6). Mar- 

 ginal teeth with a long, oblique, bifid mesocone united at base with 

 the ectocone, which becomes bifid on the outer teeth (pi. 18, fig. 7). 



Genitalia: Vestibule short; penis stout, continued above in an 

 epiphallus, in which the retractor and then the vas defer ens is inserted, 

 and terminating in flagellum ; penis corrugated within, and having 

 a large papilla at its apex (pi. 18, figs. 2, 4). Vagina stout, bound 



