RATHBUN— MARINE BRACHYTJRA 215 



84. Euxanthus rugosus Miers (Plate 18, fig. 1). 



Euxanthus exsculptus var. rugosus Miers, Zool. Alert, Crust., 1884, p. 527. 



Salomon ; 2 $ (1 ovig.). Pei-os, Coin ; 1 $. Coetivy ; 2 $, 3 ?, mostly small. 



Carapace, chelipeds and sternum rugose and granulate ; ventral surface of carapace 

 and maxillipeds granulate ; lobules rougher and more convex in the adult than in the 

 young. Antero-lateral borders cut into five tuberculiform teeth ; interspaces increasing in 

 width from front to back. 



A large nodule on the outer surface of the wrist ; 3 longitudinal rows of granules on 

 the lower half of outer surface of palm. Fingers coarsely granulate, fitting close together ; 

 brown colour of immovable finger running well back on the palm, especially on lower margin 

 and inner surface. 



This species, for such I believe it to be, is distinguished easily by its roughness from 

 E. exsculptus (Herbst), which also has the second and third teeth of the lateral margin 

 not tuberculiform. 



85. Euxanthus herdmani Laurie. 



Euxanthus herdmani Laurie, in Herdman, Ceylon Pearl Fisheries, pt. v, Suppl. Rept. 

 xl. 1906, p. 400, pi. I, figs. 9, 9 a— c. 



Amirante, 25— 80 fms., Sta. E 11; 1 ? juv. 



C. 1. 8'3 mm., C. b. 11 mm. 



Surface of carapace not only pitted, but covered with very fine flattened granules. 



86. Hypocolpus diverticulalus (Strahl). 



Cancer sculptus Milne Edwards, Hist. Nat. Crust., i. 1834, p. 376. Not C. sculptus 

 Herbst, 1794. 



Melissa diverticulata Strahl, Arch. f. Naturg., xxvii. Bd. 1, 1861, p. 103. 



Hypoccelus sculptus A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat., Paris, i. 1866, 

 p. 295. 



Cargados Carajos, reef ; 2 $. 



87. Xantho impressus (Lamarck). 

 Xantho impressus Alcock (3), p. 115. 

 Coetivy ; 1 ?. Praslin ; 1 $. 



88. Leptodius exaratus (Milne Edwards), var. 

 Xantho (Leptodius) exaratus Alcock (3), p. 118. 



Praslin, reef; 1 <?juv. Saya de Malha, 55 fins., Sta. C 15 ; 1 ^ juv., 1 ? juv. 



These specimens are not typical exaratus. The specimen from Praslin, 8 "5 mm. long 

 and 1 1 - 7 mm. wide, has the lateral teeth narrow, prominent, the last 2 tipped with a sharp 

 spine ; the front shows no sign of subdivision into 4 lobes. The specimens from Saya de 

 Malha show even greater divergence in the same directions from typical exaratus ; carapace 

 still narrower, $, 8 - 8mm. by 12 - 2 mm., teeth narrower, the last 3 tipped with a sharp 

 spine, front the same. This form approaches L. molokaiensis. 



SECOND SERIES— ZOOLOGY, VOL. XIV. 28 



