1896.] A. A 1 cock — Carcinological Fauna of India. 269 



fig. 10, and Cat. Leucos. Brit. Mus. p. 22 : A. Milne Edwards, Nouv. Archiv. X. 

 1874, p. 48, pi. iii. fig. 4. 



Carapace subglobular with an abruptly prominent bidentate front ; 

 closely covered everywhere, except in the anterior lialf of tlie front, 

 "with elongate granules some of which are large and claviform. The 

 regions of the carapace are fairly well defined. In the position of the 

 marginal spines oi A. undecimsjpinosa there are 11 marginal prominences, 

 of which only 4 or 5 in the posterior part of the carapace deserve the 

 name of spines, the others being denticles not vastly larger than the 

 enlarged claviform tubercles of the dorsal surface. These spines and 

 denticles are covered with secondary granules in all or part of their 

 extent. 



The chelipeds, even in the adult male, are not If times the length 

 of the carapace : the arms are elegantly granular ; the wrists have 

 a few granules and, on their oater surface, a tooth ; the hands are 

 nearly smooth : the fingers are little shorter than the hand. 



The legs are slender and perfectly smooth. 



The carapace of the adult male is 8 millim. long and 6 millim. 

 broad, that of the adult female is 10 millim. long and 9 millim. broad. 



Loc. Andamans and Maldives. In the Indian Museuna collection 

 are 11 specimens — young and adults of both sexes, including ovigerous 

 females. 



93. Arcania pulcherrimaj Haswell. 



Arcania septemspinosa, Bell nee Fabricius, Bell, Trans. Linn. Soc, Vol. XXI. 

 1855, p. 310, pi xxxiv. fig. 7, and Cat. Leucos. Brit. Mus. p. 21. 



Arcania pulcherrima, Haswell, P. L. S., N. S. Wales, IV. 1879, p. 58, and Cat. 

 Austral. Crust, p. 131: Miers, Zool. H. M. S. 'Alert' p. 253 {uhi synon.), and 

 * Challenger ' Brachyura, p. 299 (footnote). 



Carapace transversely ovoid, the front not breaking beyond the 

 general outline : its surface everywhere covered with miliary granules, 

 amid which stand out 13 or 14 gianule-covered tubercles arranged in 

 five incomplete longitudinal rows. Round the margin of the carapace 

 are 10 granule-covered prominences, the first two of which on either 

 side are mere denticles, while the remaining six are broad spines, — 

 those at the lateral epibranchial angle on either side being much the 

 longest. The regions of the carapace are ill defined. The inner 

 canthus »of the orbit is not prolonged into a spine as it is in all the 

 preceding species. 



The chelipeds are slender even for the genus, and in the adult 

 male are just over twice the length of the carapace : the arm alone 

 is elegantly granular : the fingers are a little shorter than the hand. 

 The true legs are slender and perfectly smooth. 



