1873.] J. Wood-Mason — On a JVew Genus of Lander ah s, 201 



b«fc partly by a short triangular process of the cpistoma. The flagella of 

 the antennae are rudimentary. Both divisions of the suborbital lol)es have 

 their margins roughened with small tubercles, but the external one not near- 

 ly so distinctly so as it is represented to be in fig. 1 of pi. XVI. 



The sternal region is much broader than long, its greatest breadth be- 

 ing between the bases of the second pair of legs. 



The male appendages are very stout and long, reaching beyond the'fifth 

 postabdomiual somite, and are connected at their bases with a remarkably 

 stout and highly indurated semicircular plate which arches over the intesti- 

 nal canal ; a similar plate has been observed in the genus Cardisonia by S. 

 I. Smith,* and is, doubtless, present in all Geearcinidce. 



Postabdomen of the female broadly oval, about as broad as long, covering 

 all but the margins of the sternal region, broadest across the posterior third 

 of its fifth somite ; last segment, trefoil-shaped, its sides being slightly emar- 

 ginate, with its antero-lateral angles slightly covered by the produced pos- 

 tero-lateral angles of the preceding somite. 



The chelipedes are equal and very powerful in the male ; subequal and 

 slenderer in the female ; their meropodites, which in the male, as in ^elocar- 

 cinus Lalandei, extend much beyond the lateral borders of the carapace, but 

 which in the female hardly reach the level of the branchial regions, have a 

 few obtuse tubercles on their anterior, and some coarse tuberculated squami- 

 form ridges on their posterior angles. The chelae are granulated and orna- 

 mented, especially on the fingers, with minute dark-coloured smooth tubercles : 

 their toothed prehensile edges meet, in the male, only at the extremities 

 which are feebly excavated spoonlike ; the margin of the spoonlike excava- 

 tion in the propodite is notched for the reception of the external cutting edge 

 of the dactylopodite, so as to form scissor-like organs. 



The ambulatory legs are also remarkably powerful ; their meropodites 

 have their edges and sides much roughened by squamiform tuberculation ; 

 the upper crest of their carpopodites is armed with a row of minute spinules ; 

 their propodites have a row of stronger spines on each of their four angles, and 

 the dactylopodites are provided with six rows of spinelike teeth. 



Colours : upper surface of the carapace and the legs red violet, the 

 claws whitey-brown faintly tinged with reddish violet ; the scars at the ex- 

 tra-orbital angles, in the middle of the branchio-gastric suture on each side 

 of the mesogastric region, etc., and the margins of the orbits, yellow ; the 

 flat posterior portion of the carapace is also much variegated with impure 

 yellow. 



Breadth of carapace of the male, 108 m m. 



Length „ „ „ „ 80 mm. 



.-. B: L:: 1.35: 1; 

 * Trans. Connecticut Academy, 1870, Vol. II, p. 142. 



