CRUSTACEA. OP THE MER&UI ARCHIPELAGO. 101 



of Telphusce in tlie Zoological Museum of Berlin, informed me 

 that it was not represented in that Museum. Though closely 

 allied to T. CalUamra, it is distinguished from it at first sight 

 by the more enlarged front and, probably even from all other 

 TelphuscE, by the remarkable structure of the postfrontal ridge. 



The outer appearance of the cephalothorax is very similar to 

 that of Telphusa Callianira, being rather narrow, although broader 

 than long, and having the epibranchial regions scarcely if at all 

 inflated. Tlie proportion o£ the distance between the epi- 

 branchial teeth to the length of the cephalothorax (the abdomen 

 not included) is as 16 : 13, so that the carapace is comparatively 

 a little broader than that of Telphusa Callianira. The upper 

 surface is rather depressed ; anteriorly it is very declivous and 

 the front is strongly deflexed. The proportion of the distance 

 between the epibranchial teeth to the breadth of the anterior 

 margin of the front is as 16 : 7|, so that the front is almost 

 half as broad as the distance between the epibranchial teeth. 

 The anterior margin of the front presents a wide but very 

 shallow median sinus . As in the preceding species, the frontal 

 margin forms a right angle with the upper margins of the orbits, 

 and the upper surface of the front is somewhat granular. The 

 upper surface of the carapace has nearly the same structure 

 as that of T. Callianira. The postfrontal ridge is interrupted 

 in the middle by the median frontal furrow, and again on each 

 side at some distance from the epibranchial teeth ; the two 

 median (or internal) portions are therefore, as in the preceding 

 species, more advanced than the lateral, from which they are 

 completely separated. The anterior or median portions of the 

 ridge, which occupy as usual the epigastric lobes, do not con- 

 stitute a single ridge, but are composed of four or five smaller, 

 parallel, rugose elevated lines. The lateral portions, however, 

 are ridge-like and directed towards the epibranchial teeth ; but 

 are not continued so far, as they are interrupted at some distance 

 from the lateral margins. As in T. Callianira, one or two rugose 

 lines are observed immediately behind the interruption. This 

 species therefore probably differs from all other Telphicsce by the 

 occurrence of two accessory median ridges immediately behind the 

 postfrontal ridge, i. e. at some distance behind the internal or 

 median portions of the latter, one on each side of the median 

 frontal furrow. These ridges are not continued behind the lateral 



