102 CALCINUS INTERMEDIUS. 



Calcinus intermedins^ n. sp. 



A single specimen of Calcinus , inhabiting like the pre- 

 ceding species , the shell of a Strombus gihherulus , was col- 

 lected at Djeddah and I think it to be new, though it is 

 most closely allied to Calcinus rosaceus Heller from the 

 Red Sea and Calcinus niticliis Heller from Taiti. 



I will first mention the characteristic differences between 

 these two species and afterwards describe our specimen 

 more fully. 



Our species may be distinguished at first sight from the 

 rosaceus Heller by the rounded convex upper margin of the 

 larger hand being quite unarmed , without tubercles , by the 

 fingers of the larger hand being punctate but not granu- 

 lar and by its coloration , the basal half of the tarsi being 

 violet-colored. It differs from the Calcinus nitidus from 

 the shores of Taiti distinctly by the under margin of the 

 larger hand not being rounded , but being rather acute 

 and granular , by the more hairy ambulatory legs and also 

 by the coloration , the larger hand being quite of a white color 

 without yellowish spots as are seen in the Taiti species. 



Anterior part of carapace rather a little convex, smooth, 

 punctate anteriorly, somewhat hairy on the lateral mar- 

 gins; gastrical region only defined posteriorly by two 

 lines that make an almost right angle with one another , 

 but without a short median line in its anterior part as is 

 found in the rosaceus of Heller. Rostrum very small, tri- 

 angular and acute , external angles of the frontal margin 

 rather rounded. 



Eye-peduncles very slender , longer than the width of the 

 frontal margin, and also much longer than the peduncles 

 of the external and internal antennae; ophthalmic scales 

 extremely small , triangular and acute. Basal spine of the 

 external antennae very short. Anterior legs very unequal, 

 arm with an acute upper margin ; upper margin of the 

 carpus rounded and terminating anteriorly in a very small 

 acute spine , its outer surface provided with a tubercle , 



Notes Irorti the Leyden Mluseuni, Vol. III. 



