268 Carcinological Fauna of India. 



6. The carapace in the adult male is a little more elongate. 

 Two adult malss and a half-grown female from the Andamans are 

 in the Indian Museum collection. 



The differences above noted are plain enongh in extreme forms, but their sum 

 is not constant, as it is in the case of the differences between A 7-spinosa and 

 A. 5-spinosa, so that it seems doubtful whether A. 9-spi?wsa is really distinct from 

 A. 11-spinosa. 



91. Arcania erinaceus, (Fabr.) 



Cancer erinaceus, Fabricius, Mantiss. Insect. I. 325, and Ent. Syst. II. 460 : 

 Herbst, Krabben, I. ii. 258, pi. xx. fig. 111. 



Leucosia erinaceus, Fabr., Ent. Syst. Suppl. p. 352 : Latr., Hist. Nat. Crust, 

 et Ins. VI. 119. 



Arcania erinaceus, Leach. Zool. Miscell. III. p. 24 : Desmarest, Consid. Gen. 

 Crust., p. 170, pi. xxviii. fig. 1 : Milne Edwards in Cuvier Regne An., Crust., pi. 

 xxiv. fig. 2, and Hist. Nat. Crust. II. 134 : Bell, Trans. Linn. Soc. Vol. XXI. 1855, 

 p. 309, and Cat. Leucos. Brit. Mus. p. 20. 



Carapace globular, everywhere thickly covered with thorns and 

 spine-like granules, amid which the smooth shallow sulci that define 

 the branchial and hepatic regions are visible. Round the margin of 

 the carapace are eleven large spines, similar in position to but larger 

 in size than those of A. undecimspinosa, and covered with secondary 

 spinelets. The ventral surface of the external maxillipeds, the thoracic 

 sterna, and the abdominal terga are all also sharply granular. The 

 front ends in two prominent sharp teeth. 



The chelipeds and the true legs have their meropodites covered 

 with thorns, and the other joints — except the dactyli, the distal half of 

 the hand, and the fingers — sharply granular. The chelipeds, even in 

 the adult male, are only about If times the length of the carapace 

 (spine excluded), and the fingers are a little shorter than the palm. 

 The first pair of true legs exceed the arms in length by their last 2|- 

 joints. 



The carapace of the adult male is 16 millim. long and 14 millim. 

 broad; that of the adult female is 21 millim. long and 19 millim. 

 broad. 



Loc. East coast, from the Hooghly to Pondicherry. In the Indian 

 Museum collection are an adult male and a young and three adult 

 females. 



92. Arcania tuberculata, Bell. 



Arcania tuberculata, Bell, Trans. Linn. Soo. Vol. XXI. 1855, p. 310, pi. xxxiv. 

 fig. 8, and Cat. Leucos. Brit. Mus. p. 21. 



? Arcania Ixvimana, Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 310, pi. xxxiv. 

 273 



