266 A. Alcock — Carcinological Fauna of India. [No. 2 7 



88. Arcania quinquespinosa, Wood-Mason MS. name, 

 Alcock and Anderson. 



Arcania quinquespinosa, Alcock and Anderson, J. A. S. B., Vol. LXIII. pt. 2, 

 1894, p. 206, and 111. Zool. R. I. M. S. " Investigator," Crast., pi. xxiv. fig. 6 (in the 

 press). 



? Arcania septemspinosa, var. gracilis, Henderson, Trans. Linn. Soc. Zool. (2) V. 

 1893, pp. 403, 404. 



Differs from A. septemspinosa (Fabr.) only in the following parti- 

 culars : — 



1. It is a much smaller species, the carapace of the adult being 

 less than 12 millim. long, and less than 14 millim. broad. 



2. The outline of the carapace is broadly conical, owing to the 

 bulging, obliquely backwards, of the branchial regions. 



3. The front is sharply bidentate, instead of bilobular. 



4. The large spines of the margins of the carapace are relatively 

 smaller, and the spine on the postero-lateral border, on either side, is 

 either altogether wanting or is represented only by a granule. 



5. The regions of the carapace, with the single exception of the 

 boundary between the gastric and cardiac regions, are distinctly delim- 

 ited by fine grooves. 



6. The fingers are nearly twice the length of the hand. 



7. The cardiac region in life, and even in fresh spirit specimens, 



. shows as a large bright red milk-white-edged ocellus. The rest of the 

 carapace is delicate pink in life. 



In the Indian Museum collection are 27 specimens — chiefly adult 

 males and egg-laden females — from the coasts of Arakan, Ganjam, 

 Vizagapatam, Ceylon, and the Persian Grulf. 



89. Arcania undecimspinosa, De Haan. 



Arcania undecimspinosa, De Haan, Faun. Japon. Crust., p. 135, pi. xxxiii. fig. 8 : 

 Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 309, and Cat. Leucos. Brit. Mns. p. 21 : 

 Miers, Zool. H. M. S. 'Alert 'pp. 518, 548: (?) A. 0. Walker, Journ. Linn. Soc, 

 Zool., Vol. XX. 1890, p. Ill : Ortmann, Zool. Jahrbuch., Syst. etc., VI. 1892, p. 577 : 

 J. E. Henderson, Trans. Linn. Soc, Zool. (2) V. 1893, p. 404. 



Arcania granulosa, Miers, Trans. Linn. Soc, Zool., (2) I. 1875-79, p. 240, pi. xxxviii. 

 fig. 29 (fide Miers, P. Z. S. 1879, p. 44) : Haswell, P. L. S., N. S. Wales, IV. 1879, 

 p. 58, and Cat. Austral. Crust, p. 131. 



? ? Arcania novemspinosa var. aspera, Miers, Ann. Mag. Nat. Hist. (5) V. 18S0, 

 p. 317. 



Carapace longitudinally ovoid in the male, nearly globular in the 

 adult female, uniformly covered either with rather distant miliaiy gra- 

 nules or with close-set short prickles, amid which the fine smooth 

 grooves that define the regions of the carapace are very distinct, — the 



