566 COLLECIIOSS PEOM THE WESTEEN INDIAN OCEAN. 



2. Gonodactylus graphnrus, Miers. 



A series of specimens was obtained at the Seychelles (No. 194) 

 with the preceding species. 



Both G. ehiragra and Q. graphurus are referred to at p. 29S of 

 this Eeport. 



3. Gonodactylus elegans. (Piate LII. fig. B.) 



The body is smooth, not longitudinally costated ; carapace nearly 

 oblong, without spines at the antero4ateral angles. Eostral plate 

 smooth and somewhat transverse, with its anterior margin regularly 

 arcuated, and the posterior margin straight, its distal extremity not 

 acute. Antepenultimate and penultimate thoracic segments rounded 

 on the sides, and the former but little laterally produced ; the last 

 thorilcic segment is overlapped on the sides by the produced and 

 rounded antero-lateral lobes of the first postabdominal segment. 

 The postero-lateral angles of the fourth to sixth postabdominal seg- 

 ments are acute ; the third to fifth segments have each on the dorsal 

 surface five small pits ; the sixth segment has its posterior margin 

 armed with four small spines (including the produced and spiniform 

 postero-lateral angles); the terminal segment is about as long as 

 broad, dorsaUy nearly smooth, with an acute longitudinal median 

 carina, which terminates posteriorly, behind the distal margin, in a 

 small spinule ; the posterior margin is armed with six strong spines, 

 of which the submedian pair are tipped with a small mobile spinide, 

 and have between them about twenty-six minute spinules ; between 

 the submedian and the next large spines are two smaller teeth, and 

 between the second and third larger- spines one smaller tooth. The 

 eye-peduncles are robust, and about reach to the distal end of the 

 penultimate joint of the antennules, one of whose three flagella is 

 much shorter than the others. The antennae are about as long as 

 the antennules ; the antepenultimate peduncular joint is armed with 

 a short spinule ; the basal scale is very much narrowfed at base, and 

 rounded and ciliated at its distal extremity. The raptorial limbs 

 have the merus-joints thickened through about two, thirds of their 

 length, and thence narrowing distally; carpus and penultimate 

 joint slender and unarmed ; dactylus slender and but little ventricose 

 at base, armed on the proximal half of its inner margin with two 

 teeth, and with the distal extremity slender and acute. The appen- 

 dage to the antepenultimate joint of the three posterior thoracic 

 limbs is styliform, slender, and very nearly as 'long as the penulti- 

 mate joint. The postabdominal uropoda are about as long as the 

 terminal segment, their basal processes terminate in two strong and 

 nearly equal spines, and there is a small spine above the outer 

 ramus, which latter is a little longer than the inner ramus, biarti- 

 culate, the basal joint armed on its outer margin with a series of 

 strong spinules ; the inner ramus is ovate, ciliated, and unarmed. 

 Length of the largest specimen about 11 lines (23 millim.). 



