CRUSTACEA. 205 



33. Euxanthus tuberculosus. (Plate XIX. fig. A.) 



Carapace transverse, moderately convex, everywhere covered with 

 numerous closely-set rounded tubercles, which in the adult are 

 themselves distinctly puuctulated ; similar tubercles cover the outer 

 surface of the -wrist and palm of the chelipcdes and the posterior 

 surface of the ambulatory legs ; the cervical suture and the suture 

 defining the anterior part of the nasogastric lobe are deep and well 

 defined ; the tubercles are smallest, but yet distinct, on the cardiac 

 and intestinal regions and posterior and postero-lateral margins ; the 

 frontal margin is divided by a rather deep median notch ; the antero- 

 lateral margins are divided into four rounded tuberculated lobes, 

 the first of which is often scarcely distinguishable. The parts of the 

 body immediately below the antcro-lateral margins are granulated, 

 but the rest of the inferior surface is nearly smooth, the sternum 

 and postabdomen rather coarsely punctulatcd ; the basal antennal 

 joint enters (in the adult) well within the inner orbital hiatus ; the 

 merus-joiut of the outer maxillipedes is transverse and much shorter 

 than the preceding joint. The chelipedes are robust ; the merus or 

 arm short, and tuberculated at its upper and distal extremity ; wrist 

 and palm (as stated above) closely tuberculated on their upper and 

 outer surfaces, the tubercles, even in the adult, somewhat conical 

 and acute ; inner margin of the palm having some small granules ; 

 fingers shorter than the palm, denticulated on their inner margins, 

 and having between them when closed scarcely any hiatus ; mobile 

 finger granulated above at base ; both fingers obtuse and rounded at 

 apex, or (in the smaller examples especially) even somewhat exca- 

 vated. The fourth to sixth joints of the ambulatory legs are com- 

 pressed, tuberculated ; the tubercles (of the superior margin 

 especially) high, conical, and acute ; the dactyli are small, slender, 

 armed with small subspiniform granules, and pubescent distally, with 

 a small naked terminal claw. Length of the largest adult example 

 (from which the description is taken) 11 lines (23 millim.), greatest 

 width nearly 1 inch 4 lines (33 millim.). 



Of this species, an apparently adult but not full-sized male 

 and female are in the second collection from Thursday Island 

 (Xo. 1G7), obtained on the beach; a young male from the same 

 locality (Xo. 177), and another young example from Warrior 

 Reef, Torres Straits, 10 fms. (no. 137). There are in the British- 

 Museum collection a male from X. Australia (Dr. J. R. Elsey), 

 and an adult male from the Australian seas without definite loca- 

 lity, from which the description and figure are taken (Dr. J. S. 

 Bowerbank). The coloration varies in the different examples, all 

 of which are preserved in spirit : the two specimens which have 

 been longest in the collection are a chocolate-brown ; the two largest 

 specimens in the ' Alert ' collection (Xo. 167) are of a deep purplish 

 red, and the two smallest of a bright orange hue. 



As the basal antennal joint enters well within the inner orbital 

 hiatus (see fig. «), this species must, I think, be referred to the 

 genus Euxanthus, from all the species of which genus known to me 



