MR. E. J. MIERS ON THE OXYSTOMATOUS CRUSTACEA. 237 



punctated, the concavity and convexity of the hepatic region is more decided, and 

 there are but four clearly distinct tubercles in the cavity of the thoracic sinus. The 

 colour is dark brown ; there are three white spots upon each side of the gastric 

 region, and a small red circle on the back of each branchial region. The bases 

 of the fingers, tubercles of the arms, and joints of the ambulatory legs are banded 

 with orange, as in many species of the genus. Length 1 in. ; breadth f in. 



Hab. Ceylon, 



This species was presented to the Trustees of the British Museum by E. W. H. Holds- 

 worth, Esq., with a valuable series of Crustacea from Ceylon. The specimen is a female. 



4 Leucosia bbunnea, sp. n. (Plate XXXVIII. figs. 10-12.) Carapace convex, smooth 

 and polished, but very slightly punctated towards the anterolateral margins, and 

 with a finely beaded line continued to the middle of the posterolateral margins. 

 Eront very slightly projecting beyond the eyes ; behind it there is a short longi- 

 tudinal median ridge between the concave hepatic regions. Thoracic sinus wide, its 

 anterior margin straight, not beaded, and forming nearly a right angle with the 

 anterolateral margin of the carapace. Arm with numerous, small, crowded tubercles 

 upon its infero -anterior surface, upper surface with a group of very small tubercles at 

 base, beyond them four tubercles placed in a quadrangle ; anterior and posterior 

 margins with a line of tubercles; wrist smooth; inner margin of hand with 

 a granulated line ; fingers straight. Colour brown, inclining to red on the back of 

 the carapace. Length 1^- in. ; breadth 1 in. 



Sab. Singapore. 



This species is distinguished from its congeners by the form of the thoracic sinus &c. 



5. Leucosia eetictjlata, sp. n. (PI. XXXVIII. figs. 13-15.) Carapace subglobose, 

 smooth ; sides with a beaded line extending from the front of the hepatic regions 

 along the anterolateral and about halfway along the posterolateral margins. Eront 

 flat above, and not produced beyond the eyes ; anterior margin straight. Thoracic 

 sinus short; anterior margin smooth, not beaded, and not defined at either ex- 

 tremity. The cavity of the thoracic sinus, above the insertion of the anterior legs, 

 is filled by a series of about half-a-dozen flattened tubercles. Anterior legs strong ; 

 arm tubercular on the proximal half of its upper surface, the distal half smooth and 

 polished ; on the anterior and posterior margins the tubercles extend nearly to the 

 extremity of the arm ; on the anterior surface, and below at base, the tubercles are 

 numerous and crowded; wrist smooth, hand compressed, outer margin smooth, 

 inner with an obscurely beaded line. Abdomen of male smooth, without any 

 tubercle on the penultimate joint ; terminal joint very small, the others of about 

 equal width throughout. Colour greyish green, yellowish on the sides and back of 

 the carapace, which is marked with reticulating lines of a darker green. Ambulatory 

 legs yellowish brown. On each side of the carapace, above the point of insertion of 

 the anterior legs, there is a group of from six to a dozen small red granules. Length 

 \\ in. ; breadth 1 in. 



2i2 



