GUDE : NEW AND UNFIGURED SPECIES OF PLECTOPYLIS. 



117 



extremity clavate, the lower extremity joined to a long horizontal 

 flexuous fold, whose posterior termination touches the posterior plate; 

 below this occurs a shorter flexuous horizontal fold, the posterior 

 termination of which, also touches the posterior plate ; above the 

 anterior plate occurs a short, free, horizontal fold. Palatal armature 

 composed of six folds: the first short, thin, and horizontal; the second 

 longer, obliquely descending posteriorly ; the third and fourth subver- 

 tical, slightly deflected posteriorly below ; the fifih curved, obliquely 

 descendi'ng backwards ; the sixth short and slight, horizontal, placed 

 below the posterior extremity of the preceding. 

 Major diam. i9'5, minor i6"5 ; alt. 9 millim. 



d. e. 



Figs. 5a — 5e. — Pledopylls [Endoplon) vUIcdaryi, Ancey. 



P. villeiJari/i resembles P. srlilumhertjeri, both above and below, 

 but it is smaller, and the strongly raised flexuous ridge at the aperture 

 recalls P. pihhryana. In the parietal armature the present shell has 

 affinity with P. daidzenhergi, but differs from it in the anterior plate 

 being oblique instead of horizontal, and in the upper horizontal fold 

 being free, and, below, it lias in addition a second free horizontal fold. 



The shell figured is the type of P. choanompJiala in the collection 

 of Dr. von Mollendorff. 



Figs. 5a — 5c show three different aspects of the sliell, the parietal 

 armature is shown in fig. 5d, and the palatal folds in fig. 5e. 



Mr. Ancey has been kind enough to forward the type of P. viUedari/i 

 for comparison. Upon examination it proves to be identical with 

 P. choanomphaJa, Mlldff., which name therefore must be consigned 

 to the synonymy of P. villedari/L 



