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



from the Samoa Islands. There are in the national collection eight species of this 

 genus, apparently distinct from any that have been hitherto recorded. 



1. Letjcosia euscomactjlata, sp, n. (PI. XXXVIII. figs. 1-3.) Allied to L. urania, 



Herbst, but less convex, with a more distinct, marginal beaded line ; the carapace 

 distinctly punctated on the sides ; anterior part of the thoracic sinus much 

 narrower, and its cavity, above the point of insertion of the thoracic anterior legs, 

 filled by a confluent series of but three or four closely placed, flattened tubercles, 

 whereas in L. urania the tubercles are at least twice as numerous, and remote from 

 one another. Abdomen of male smooth, 4-jointed. Colour light, yellowish brown, 

 with very indistinct spots and patches of dusky grey on the carapace. Length |- in. ; 

 breadth f in. 

 Sab. Hed Sea, Gulf of Suez. 



2. Letjcosia pulcheerima, sp. n. (PI. XXXVIII. figs. 4-6.) Carapace smooth, 



convex, sparsely punctate towards the front and anterolateral margins, which are 

 defined by a beaded line which terminates above the point of insertion of the first 

 pair of ambulatory legs. Hepatic regions concave in their front portion, and 

 slightly convex behind. Arm with a line of large tubercles on its anterior and 

 posterior margins, upper surface with a group of small tubercles at base, followed 

 by four larger ; lower surface with many closely placed tubercles at base ; wrist 

 and hand smooth, fingers not quite meeting at base when closed. Thoracic sinus 

 deep, narrow, and well-defined in front, with a beaded margin; its cavity, above 

 the base of the anterior legs, filled with a series of about half-a-dozen small 

 tubercles. Colour stone-grey, inclining to brown on the back and white on the 

 ambulatory legs, a circle of rose-pink upon the back of each branchial region, a 

 trilobate pattern formed by three confluent semicircles of the same colour upon each 

 side of the anterior half of the carapace (these are confluent in the middle line, and 

 together somewhat resemble in outline a butterfly with the wings extended) ; there 

 are three white spots in the centre of each trilobate pattern ; the basal half of the 

 fingers is orange ; and there are rings of the same colour surrounding the joints of the 

 ambulatory legs and tubercles of the arms, also small spots of orange near the 

 lateral margins and upon the inferior surface of the carapace. Length l-^- in. ; 

 breadth y^ in. 

 Hab. Lizard Island. 



In all structural characteristics this species is nearly allied to L. neoealedonica, 

 A. M.-Edw. ; but it is preeminently distinguished from this and all other species of the 

 genus by the strikingly beautiful coloration and markings of the carapace. The thoracic 

 sinus is also deeper, narrower, and better-defined in front, with a beaded margin. Only 

 a single specimen (?) in the collection. 



3. Letjcosia ornata, sp. n. (Plate XXXVIII. figs. 7-9.) This species, in all struc- 



tural characteristics, very closely resembles L. pulcherrima ; but it is more strongly 



