NERITELLA. 



105 



rather broad ; black, blue within, columellar 

 area deep blood-tstaiued. 



Gulf of California. This appears to be dis- 

 tinct from any of its congeners in form, while 

 the deep-toned coloring is characteristic. 

 (/Jeei-e.) 



Neritina californica, Reeve, Con. Icon. 20, 

 a, h (Oct. 1855). 



Fig. 209. 



Neritina californica. 



I have seen no authentic specimen of 

 this species, the original description and figure of which are given 

 above. 



Fig. 210. 



IVeritella cassicilliim, Soweebt.— Of a globose form, slightly 

 inclining to oval, with an olive-green epidermis, under 

 ■which may be seen numerous black lines, angulated so 

 as to leave white, triangular spots, which are larger in 

 three bands across the shell ; spire obtuse, consisting 

 of four whirls ; aperture semicircular, with the outer 

 lip slightly thickened and the columella inclining to 

 orange, narrow, swelled, and minutely crenulated on 

 its nearly straight edge. Locality unknown. (Soivcrby.) 



Neritina cassicultnn, Sowerby, Conch. 111. f. 55 ; Thes. 

 Conch. 521, pi. cvi, f. 194. — Cakpentee, Maz. 

 Shells (1858), 258 ; Brit. Mus. Rep. pi. ix, f. 5 (1857). 



Carpenter quotes this species from Mazatlan. I have seen no 

 specimen, but give above the original description and figure. 



Neritina 

 cassiculum. 



Neritella picta, Soweebt. — Subglobose, grayish, variously painted, 

 with black lines or reticulations and whitish spots. There is a peculiar 

 enamel-like appearance about the external surface ; the columella is in- 

 variably of a chestnut color, rather swelled, and obscurely 

 crenulated at the margin. Fig. 211. 



Panama, on a mud bank, partially overflowed with fresh 

 water: Cuming. {Soiverby.') 



Neritina picta, Sowekby, Pr. Zool. Soc. 1832, 201 ; Illustr. 

 pi. Ixxxvi, f. 1 ; Thes. Conch. 530, pi. cxvi, f. 267-9. 

 — Reeve, Con. Icon. 101. — Desha yes in Lamarck, VIII, 2^^^^^^ pteta. 

 588.— Carpenter, Maz. Cat. 259 (1856). 



A very variable species found wnthin the limits included in my 

 work — at Mazatlan, as well as further south. The original de- 

 scription and figure are given above. 



There is a Neritina jncta, of Ferussac (Hist. fig. 4-7), found 

 19 



