CARCINOLOGICAL STUDIES. 9 



Etisodes frontalis, A. Milne Edwards, in: Nouv. Archives du Mu- 

 séum, T. IX, p. 235. 



Two fine male specimens from üpolu , one of which is 

 adult. The latter was sent by me to Prof. Milne Edwards , 

 who informed me that this species was referred in the 

 Collection of the Museum to Etisodes frontalis Dana, and 

 that the specimens of the Museum were also collected at 

 Upolu. I believe he is right, though 1 must observe that 

 the cephalothorax of Dana's specimen appears comparati- 

 vely less enlarged and narrower than those of our indivi- 

 duals; but the original specimen, described by Dana, was 

 very young , the cephalothorax measuring only eight millim. 

 in breadth , and the difference may , therefore , perhaps be 

 ascribed to this fact. 



This species is certainly different from Etisodes Electra 

 Herbst = sculptilis Heller, and Miers (Report Crustacea 

 Voyage of H. M. S. Alert, p. 217) was wrong in uniting 

 these two species. 



The cephalothorax is exactly once and a half as 

 broad as long. The upper surface is slightly convex 

 anteriorly, and more depressed posteriorly; it is rather 

 strongly lobulate, and the interregional grooves are 

 rather deep, though narrow. The median frontal furrow is , as 

 usual , divided in two furrows which border the mesogastric 

 area 3 M, issuing into the gastrobranchial i. e. cervical suture. 

 The epigastric lobes are prominent, and distinctly separated 

 from the less prominent postfrontal lobules 2 F; they are also 

 separated from the upper walls of the orbits by longitudinal 

 grooves , which run parallel with the median frontal furrow , 

 and which begin at the hiatus between the internal orbital 

 and external frontal angles. The protogastric regions 2 M 

 are subdivided only anteriorly by the described longitudinal 

 grooves which border the epigastric lobules laterally , and 

 are for the rest undivided. The urogastric lobe 4 M is 

 distinctly defined. This is not the case with the cardiac 

 region , which is coalescent laterally with the postero-lateral 



>Jotes from tlie Leyden IMuseuna, Vol. XIIX. 



