PLEKOCHEILUS. 131 



P. COUTURESI (Ancey). 



Shell ovate, rather thin, su him perforate, a little shining ; dull 

 purple under a thin, more or less deciduous green or huff-brown 

 epidermis. Spire short, obtuse, the apex brown-purple, rounded- 

 subconoid at summit. Whorls 4, rapidly increasing, a little convex, 

 the suture impressed, marked with growth striae and minutely gran- 

 ulate : the penultimate whorl somewhat swollen on the right side ; 

 last whorl deflexed beyond the middle for a long distance, malleate 

 and very minutely granulose, the stria? forming slight folds at the 

 suture. Aperture almost vertical, irregularly oval, angular above, 

 the columellar fold calloused, inside livid purple; peristorne revolute 

 and thickened throughout, rose-purple, the margins joined by a 

 glossy parietal callus, columeilar margin a little dilated at the inser- 

 tion. Length 38, diam. 22, alt. of aperture with peristome 22 mill. 



{Ancey). 



Bolivia (teste G. Coutures). 



Eurytus couturesi ANC., The Nautilus, xiv, p. 42 (August 1, 

 1900). 



" This is more egg shaped than either E.pulicarius or E. cathcartice 

 Reeve, which seem to be its immediate allies. In form it resembles 

 E. cardinalis, Pfr., from Quito, but is a smaller and much thinner 

 shell. I have seen two specimens precisely alike, differing only in 

 size, the larger one, the type, is in my collection " (Ancey'). 



P. CASTANEUS (Pfr.). Vol. x, p. 85. PI. 21, fig. 65. 



A rather narrower form is here figured. It is of a very dark 

 color, black-brown slightly olive tinted, the aperture purple-black 

 with a pearly sheen. It is from Cauca, Colombia, and measures, 

 length 64, diam. 39, longest axis of aperture 42 mill. 



P. TRICOLOR (Pfr.). Vol. x, p. 87. PI. 21, fig. 69. 



A large form is here figured, measuring: length 47, diam. 28, 

 longest axis of aperture 30 mill., whorls 4^. 



This species belongs to the " group of P. taylorianus" and differs 

 from the species tabulated on p. 89 of Vol. x, in its more elaborate 

 color-pattern. Cousin has bungled characteristically in his syn- 

 onymy of tricolor (Bull. Soc. Zool. France, xii, 209). The variety 

 semipictus Hid. (vol. x, p. 87) was taken by him at Pahua, Ecuador. 

 Simpulopsis fulgurata Miller (see vol. xii, p. 227) is probably a 

 young specimen of this species. 



