294 COLLECTIONS FKOM MELANESIA. 



I regard the Anchistia grandis of Stimpson, from Ousima*, as 

 synonymous with Anchistia petitthouarsi. 



The differences in the proportions of the second legs in our speci- 

 men and that described by Mr. Stimpson may perhaps be due to 

 sex. Stimpson does not mention the number of the teeth (if any) 

 on the inferior margin of the rostrum in his example ; but as he 

 says "A. ensifronti affinis," it may be presumed that, as in Dana's 

 species, there are three teeth on the inferior margin of tho rostrum, 

 and also that there is, as in' that species, a supraocular spine. 



Anchistia incequimana of Heller is, according to Kossmannf, also 

 synonymous with A. petitthouarsi. It is remarkable that neither in 

 the figure of Savigny, nor in Heller's long description of A. incequi- 

 mana in the ' Beitrage zur Crustaceen-Fauna des rothen Meeres,' 

 can I find any indication of the supraocular spine ; so that our spe- 

 cimen may after all belong to a distinct species. 



14. Coralliocaris ? tridentata. (Plate XXXII. fig. C.) 



The body is rounded above and not compressed : the anterior 

 margin of the carapace bears a strong spine outside of the eye- 

 peduncles and above the basal antennal scale. The rostrum is short, 

 not reaching to the end of the peduncles, and has three spiniform 

 teeth on its upper margin ; its lower margin is entire ; the apex curves 

 gently upward and is acute. The segments of the postabdomen 

 are without spinules ; the terminal segment has four small mobile 

 spinules on its upper surface near the lateral margins, and the 

 somewhat rounded apex is tipped with a few short setae. The eyes 

 are rather short, robust, and reach about halfway to the apex of 

 the rostrum. The antepenultimate joint of the peduncles of the 

 antennules is about as long as the two following taken together ; 

 these are short and of equal length ; the longer flagellum is broken 

 in the single specimen examined, the shorter is slightly bipartite at 

 its distal end. The basal antennal scales are shorter than the 

 peduncles of the antennules, rounded and ciliated at the distal ends, 

 and with a very small spinule on the outer margin. The ante- 

 penultimate joint of the outer maxillipedes is very little longer and 

 broader than the penultimate joint, which about equals the terminal 

 joint in length. The anterior legs (the left only is perfect) are very 

 slender ; the wrist much exceeds the hand in length, the slender 

 palm about equals the fingers. Of the second legs also only the 

 left is perfect ; this limb has the joints smooth and unarmed, the 

 merus longer than the carpus, which is less than half the length of 

 the palm, which is much shrivelled, but its lower margin appears to 

 have been carinated ; the fingers are less than half the length of 

 the palm, acute at their apices, and without teeth on their inner 

 margins. The third legs are robust, with the merus and penulti- 

 mate joints compressed ; the dactyl minute, curved, and with a 

 minute tooth on the lower margin. The following legs are imperfect. 



* Proc. Acad. Nat. Sci. Philad. p. 39 (1860). 



t Zool. Ergebn. Reis. roth. Meer. ii. p. 83 (1880). 



