312 



12 



a striated crest like that on Ihe carapace. The pahn measured along its outer 

 edge is about I'/i times its greatest width; immovable finger broadly triangular, 

 sliarp-pointed ; dactylus strongly bent down. 



The legs may be entirely concealed beneath the carapace; they have thin 

 cristiform edges and very slender dactyli. 



Dimensions. — Male type, length 3 mm., width 38 mm. 



Localities. — Koh Chuen, 30 fath., shell bottom; I. 2; 1 c?, type, immature. 

 North of Koh Mesan, 15 fath., stones, shells; II. 5; 1 Ç immature. 



Philyra anatum (Herbst). 



Cancer anatum Herbst, Naturg. Krabben u. Krebse, I, 93, pi. II, fig. 19, 1783. 

 Philyra globulosa Mii.ne Edwards, Alcock, LXV, 245, 1896. 



East of Koh Chang, 6 fath., seine; I. 25; 1 c?. Off Koh Kut, 6 fath.; I. 26; 

 1? juv. Among the small islands west of Koh Chang, 4 — 5 fath., mud; III. 9; 1 c?. 

 Sound at Koh Chang, 3—5 fath., soft clay bottom; 1 cJ* 3 juv. 



Philyra olivacea Rathbun. 



Plate II, fig. 17. 

 Philyra olivacea Rathbun, Proc. Biol. Soc. Washington. XXII, 108, 1909. 



Carapace convex, elongate oval, with a well defined hepatic facet; a depression 

 either side of the cardiac and intestinal regions. Surface coarsely punctate, and, 

 on the more elevated portions, granulate. From the postero-lateral margin two 

 oblique lines run inward and converge, forming a small triangular area. 



Front subtruncate, with a median furrow, 

 and a slight point at the middle of the margin; 

 the ends of the maxillipeds are visible in a dorsal 

 view. Eyes long and slender. The lower margin 

 of the hepatic facet has a strong tooth at its 

 posterior third. The lateral margin of the cara- 

 pace is angled at the posterior end of the facet, 

 and again a short distance behind that point, at 

 the widest part of the carapace; edge between 

 these angles straight. Posterior margin narrow, 

 prominent and trilobate; in the c? the outer lobes 

 or teeth are much more prominent than in the Ç. 

 Sternum granulate; in the male there is a 

 strong line of granules bordering the anterior 

 half of the abdominal cavity. External maxillipeds with the edges granulate, the 

 exognath broadly oval at the extremity, the merus of the endognath narrow, its 

 outer edge straight. In the Ç there is a fringe of hair near inner edge of endognath. 

 The chelipeds in the adult male are VI-2 times, in the adult female l'/4 times, 

 the length of the carapace; surface granulous, the granules coarser along the inner 



Fig. 4. Philyra oliuacea, tj'pe c?, 78 mm. 



wide: a, lower view of anterior half; 



6, front view; c, abdomen. 



