OLTVA. 81 



the reticulations become lighter, verging on pink, more sparse, 

 and so merge into erythrostoma. In describing one of the 

 varieties of this protean species, WeinkaufF predicted that they 

 would some day all " be placed in one basket ;" this I have been 

 compelled to do ; but I have still retained as varietal the names 

 of the principal forms. 



0. ARANEOSA, Lam. PL 27, figs. 61, 62 ; PL 28, figs. 63-74 ; PL 

 29, figs. 75-83. 



Oval-cylindrical, a little constricted around the upper part of 

 the body-whorl, and sometimes with a faintly angulated shoulder; 

 the spire prominent ; cream-color, overlaid with a closely reticu- 

 lated pattern of brick-red to chocolate, and fasciculations of the 

 same color at the sutures ; interior cream-white or lightly tinted 

 blue or chocolate. Length, 1-5-2-25 inches. 



Panama to Cape St. Lucas L. Gal. 



Is a larger, heavier, less cylindrical species than 0. reticularis 

 of the West Indies of which it is the West Coast representative: 

 the two are ver} r probably of common derivation. The figures 

 cited by Lamarck well represent this species which is better 

 known under the name of 0. Melchersi, Menke. Weinkauff 

 having restored the Lamarckian name, I follow him, but would 

 otherwise have hesitated to drop a well-known designation in 

 favor of one which is in fact almost unknown. The other 

 synonyms are 0. oblonga, Marr. (fig. 63), 0. Pindarina, Duclos 

 (fig. 64), 0. subangulata, Phil. (fig. 65), an angulated form, 0. 

 fuscata, Marr. (fig. 66), a dark variety, 0. oriola, Duclos (fig. 67), 

 which is somewhat lighter than fuscata, 0. harpularia, Lam. 

 (fig. 68), described from a worn shell, 0. intertincta, Carpenter 

 (fig. 69), a juvenile, and 0. violacea, Marrat (fig. 70). 



Var. VENULATA, Lam. Figs. 71-73. 



Shell shorter, more swollen around the upper part; spire 

 shorter ; painting usually darker, the reticulated pattern more 

 or less broken up into nebulous spots. The synonyms are 0. 

 punctata, Marr. (fig. 72), and 0. Pindarina, Marr., not Duclos 

 (fig. 73). 



Var. JULIETTE, Duclos. PL 29, figs. 74-82 ; PL 21, fig. 91. 

 Shell very bulbous, with short spire ; thick. Length, 2 inches. 

 11 



