IU(1INUI-A. 183 



didicult to truce. :iii(l I li;nc seen woiii spcciiiu-iis ol" I'ithcr of 

 those (joiu'ra which might be readily ivferred to the others ; on 

 this account some species originally described under Siatrum 1 

 have been able to refer definitely to other groups ; whilst others, 

 from insutliciency of diagnosis, illustration or specimens are 

 retained, but with doubt. The genus is essentially Polynesian 

 in distribution, frequenting coral reefs. 



K. HYSTRix, Tjinu. PI. .oC), lig. I'.lo. 



The surface varies from nodulous to spinose ; in very large 



specimens the shell is sometimes umbilicate. Yellowish brown; 



the interior of aperture rich rose-color. 



Length, l-5-'2-5 inches. 



Sandwich Islen ; Fiji Isles ; Paumotus. 



In this, the largest species, the teeth have but little disposi- 

 tion towards grouping. 



Var. Reeveana. Crosse. PI. 5(3, tig. 19f;. 



The surface is nine-varicose instead of seven-varicose as in E. 

 clathrata, Lam. The interior of the aperture is violet-purple. 

 I do not find the distinction in the number of varices to hold 

 good, as I have before me specimens of the latter with as many 

 as ten varices. The interior of the aperture is less rugose upon 

 lip and columella, and wants, besides, the brown markings of 

 clathrata. 



Marqiiesas Isles. 



Var. spECiosA, Dunker. PI. 56. fig. 194. 



Small, rugosely tuberculose, the tubercles prominently arranged 

 in revolving series ; columella strongly four-plicate. 



Length, -83 inch. 



Rarotonga, Paumotus. 



This is a well marked variety, distinguished by its small size, 

 very deep rose-purple interior, columellar plaits, etc. It was 

 first figured by Reeve as var. of R. clathrata^ Lam., and then 

 described by Dunker. Subsequently, the latter finding Reeve's 

 figure cited as the young in Crosse's description of Reeveana, 

 abandoned his species as synonymous with that of Crosse. I 

 consider the two to be well distinguished varieties, diverging in 

 opposite directions from the type. 



