FISSURELLA.— Plate III. 



anteriorly, depressed, rather elevated iu the middle, 

 radiately mauy-striated, orifice oblong-ovate; very 

 dark purple-brown, basal margin very broad, purple- 

 brown. 



SowERBY, Pro. Zool. Soc. 1834, p. 126. Conch. Illus. f. 69. 



Hai. Valparaiso and Iquiqui, Peru (on the rocks) ; 

 Cuming. 



Distinguished by its deep pm-ple-brown or chocolate 

 colouring, and broad dark-coloured base. 



Species 20. (Mus. Cuming.) 



PissuRELLA BIKADIATA. Fks. testd ovatd, antice acumi- 

 imto-attenuatd, depressd, medio elevatiusculd, radiatim 

 profuse striata, striis tumidimculis, orificio oblongo, 

 lateribus medio coarctatis; intense cinereo-purpured, 

 radiis pallidis, quorum uno ad utrumque latus magis 

 conspicuo, obscure notatd, inargine basali latiusculo, 

 intense cinereo-purpureo. 



The two-rayed Fissurella. Shell ovate, acuminately 

 attenuated anteriorly, depressed, rather elevated in the 

 middle, radiately profusely striated, striae somewhat 

 swollen, orifice oblong, sides contracted in the middle ; 

 dark ash-purple, obscurely marked with light rays, 

 one of which on each side is more conspicuous than 



the rest, basal margin rather broad, very dark ash- 

 purple. 



Prembly, Sowerby, Pro. Zool. Soc. 18.34, p. 124. 



Eab. Valparaiso and Iquiqui, Peru (under stones on the 

 shore) ; Cuming. 



The rays of this species are very obscure, with the ex- 

 ception of one on each side diverging from the denticu- 

 lated edge of the orifice. 



Species 21. (Mus. Cuming.) 



PissuEELLA BELLA. Fiss. testd depresso-convexS, medio 

 elevatiusculd, antice acuminato-attenuatd, radiatim ob- 

 scure sulcata, margine basali angusto ; cinereo-fuscd, 

 saturate et pallide alternatim concentrici: fascial a, pur- 

 pureo-lacco vivide radiatd. 



The pretty Pissurella. Shell deeply convex, rather 

 elevated in the middle, acuminately attenuated an- 

 teriorly, radiately obscui-ely gi'ooved, basal margin 

 naiTOW, orifice oblong ; ash-brown, banded concen- 

 trically alternately lighter and darker, rayed with 

 bright crimson lake. 



Hab. Cape Horn ; Darwin. 



A comparatively smooth species, conspicuously painted 



with thirteen pm'ple-lake rays. 



