CETTSTACEA OF THE MERatTI ARCHIPELAGO. 49 



mobile finger is somewliat hairy and granular at tlie base, thougb 

 much less titan, in A. oiesus, the granules not extending beyond 

 the proximal half of the finger. The outer surface of the fingers, 

 the tips of wliicb are pointed, is smooth. The inner surface of 

 the hand is smooth, being only a little punctate at the base of the 

 mobile finger. The smaller chelipede presents the same characters 

 as the other. 



The ambulatory legs are precisely similar to those of A. oiesus, 

 being clothed with rather long yellow hairs, but they are some- 

 what granular ; the upper margin of the meropodites is minutely 

 granular, and somewhat larger acute granules are observed on the 

 upper surface of the carpopodites and propodites. 



The cephalothorax of the largest specimen, a female, is 5| 

 millim. broad ; and the species probably attains a larger size. 



37. ACTUMNUS NUDTJS, A. M.-Edio. (PI. II. figs. 2 & i.) LLj 



Actumnus nudus, Al'pTi. Milne-Edwards, Descript. de quelques especes 

 nouvelles de Crustaces Brachyures, Annul. Soc. Entom. de France, 4" ser, 

 t. vii. 1867, p. 265. 



A single female specimen was collected in the Mergui seas. 

 Prof. Milne-Edwards kindly identified it for me, and as his 

 determination is doubtless correct, I now add a full description 

 of the species. 



The specimen is nearly twice as large as that described by 

 Milne-Edwards. The cephalothorax is rather narrow, the pro- 

 portion of the breadth to the length being as 4 to 8. The 

 upper surface is very convex longitudinally, and also somewhat 

 declivous towards the lateral margins. Interregional grooves 

 are almost wholly wanting : I only observe a faintly indicated, 

 shallow, cervical suture, separating the gastric region from the 

 hepatic and branchial regions, and the usual shallow, median, 

 frontal furrow, bifurcated behind, which separates the slightly 

 prominent epigastric lobes from one another. The front, the 

 epigastric lobes, the gastric region, and especially the antero- 

 lateral regions are covered with pearl-shaped granules ; on each 

 side of the gastric region, ten or twelve of these granules are 

 arranged in an arcuate line, with the convexity directed forward, 

 which separates the antero-lateral region from the postero- 

 lateral. Each antero-lateral region (hepatic and epibrauchial) is 



LINN. JOUEN. — ZOOLOGY, VOL. XSII. 4 



