TO INDIAN CARCIXOLOGY. 343 



young individuals ; the fourth lateral spine is nearly twice the length of the third. The 

 carapace and legs are densely pubescent. 



A male of average size (from Madras) gives the following measurements : — carapace 

 (omitting spines) 31 mm. long, 27 mm. broad, third lateral spine 3 mm., fourth spine 

 5 - 5 mm., posterior median spine 4 - 5 mm., first ambulatory leg GO mm. long. 



Distribution. South India, Singapore. 



Genus Stenocionops, Latreille. 



9. Stenocionops cekvicornis (Herbst). 



S. cervicornis (Herbst), Milne-Edwards, Hist. Nat. Crust, t. i. p. 338(1834). 



Tuticorin, four females (one with ova), three males {Thurston). 



The carapace, rostral spines, ambulatory legs, and in males also the abdominal segments 

 carry numerous tufts of strong curved hairs (each hair is about 3 mm. long) which help 

 to form an attachment for the numerous sponges, hydroids, ascidians, &c, with which 

 the specimens are beset. In the male the rostral srnnes are scarcely more marked than 

 in the female, but the posterior prolongation of the carapace is narrower and more 

 upturned, and the chelipedes are stronger, with a wider hiatus between the fingers. 



The largest male has the carapace (not including rostral spines) 42 mm long and 29 

 mm. broad, the rostral spines 25 mm. long. The largest female is somewhat larger. 



Distribution. Mauritius (Milne-Edwards). 



Genus Egeria, Latreille. 



10. Egeria arachnoides (Rumph.). 



E. arachnoides (Rumph.), Miers, 'Alert' Crust, p. 191 (1884). 



( = E. indica, Leach, E. Herbstii, Milne-Edwards) . 



Madras, common (J. R. H.); Gulf of Martaban (Oates). 



There is great variation in the relative size and acuteness of the spines or tubercles on 

 the carapace of this species. In all the specimens a small spine is present at the distal 

 end of the meropodites of the chelipedes and ambulatory legs. In a single large specimen 

 (a female with the carapace 30 mm. long and 23 mm. broad) the two most posterior 

 tubercles on the middle line of the carapace are prolonged into rather prominent spines, 

 as well as the last branchial tubercle. 



The carapace of an average specimen (female) is 19 mm. long and 16 mm. broad, 

 the second ambulatory leg 95 mm. long. 



Distribution. N. & N.E. Australia, Malay Archipelago, China. 



Genus Hyastexus, White. 



11. Hyastenus Pleione (Herbst). 



H. Pleione (Herbst), De Man, Brock's Crust, p. 225, taf. vii. fig. 3 (1888). 



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