58 ZOOLOGY OP THE VOYAGE OF H.M.S. SAMAEANG. 



Carapace much wider than long, smooth, the lateral regions cup-shaped, with raised 

 edges, with an anterior and posterior groove ; lateral edges divided into three lobes, the front 

 lobe straight and reflexed backwards, the middle simple and rounded, the posterior elevated 

 and wedge-shaped ; the middle region with a strong vertical ridge ending behind in an obtuse 

 tubercle, and on each side with two perpendicular three-sided elevations, truncated at their 

 apices, with a small tubercle at their fore-bases ; posterior margin of carapace excavated, with 

 a large projecting lobe flattened above, with two ridges behind, a rounded elevation in front, 

 and numerous small tubercles near the base. 



Front entire, rounded, reflected backwards, showing a central groove on the under 

 surface. 



Fore-legs with the third joint triangular, the edges tuberculiferous ; the fourth joint 

 with two tubercular ridges on the upper surface ; fifth joint with a tubercular keel above ; 

 claws slightly curved at the ends. 



Abdomen (of female) oval, tuberculated, seven-jointed, surrounded by an elevated ridge. 



It is interesting to see the analogous armature of the carapace with that of Xanthasia 

 murigera (White) amongst the Pinnotheridce. The name Tlos is from the town of that name 

 in Lycia, so well described by Sir Charles Fellowes in his Asia Minor. It is distinct enough 

 from Tylos, another genus of Crustacea, so as not to be confounded with it in sound. 



1. TLOS MURIGER, Adams 8f White. (Tab. XIII. Fig. 2.) 



Thorace lsevi, regionibus lateralibus valcle excavatis ; marginibus lateralibus trilobatis ; margine pos- 

 teriore excavato, lobo bicarinato multis parvis tuberculis ad basin. 

 Hab. Borneonem. 



Carapace smooth ; lateral regions deeply excavated ; side-margins with three lobes, hind 

 margin excavated, a two-ridged lobe with numerous small tubercles at the base. 

 Hab. Borneo. 



X. CORYSTID^E. 



The genus Trichocera is not uncommon among the islands of the Philippine Archipelago, 

 where it is found among the reefs concealed in the coral, or hiding under stones ; it has all 

 the habits of the Xantho group ; the Corystes inhabits rather deep water, preferring the same 

 localities as the Leucosice, which it likewise resembles in its habits ; a species of Gomeza was 

 dredged by Mr. Cuming in the Philippines, but the other genera of this family do not 

 appear to be found among the islands of the Eastern Seas. 



1 . TRICHOCERA, Be Haan. 



1. TBICHOCERA GIBBOSULA, Be Haan. 



Parva, pilosa, thorace dilatato, brevi, setoso, tuberculato, tuberculis rnediis planis quinque transversim 

 dispositis; lateribus 10-dentatis; fronte 5 -dentate. 



