Carcinologlcal Fauna of India. 145 



Outer part of the pterygostomian regions densely hairy. 



Front bifid, its least breadth equal to the breadth of the orbit, 

 beyond the level of which it does not project. 



Endostomial septum extending, posteriorly, from the level of the 

 front to the level of the mouth, but deeply excised anteriorly. 



Margin of the transverse wing-like expansion of the distal end 

 of the arm four-lobed, the two anteiior lobes each with a spine : upper 

 surface of wrist and outer surface of palm nearly smooth : crest of 

 palm deeply 6- or 7-toothed. 



Andamans ; the whole of the east coast of India, from the Ganges 

 Delta to Pondicherry ; Ceylon, Persian Gulf. 



In the young the carapace is traversed longitudinally in its anterior 

 three-fourths, by 7 or 8 lines of sharpish tubercles, and is marked iu 

 its posterior third by a pair of large ocelli, one in each epibranchial 

 region. 



From an examination of a very large seizes of these young I feel 

 nearly sure that Capello's 0. guerini is to be referred to this species. 



5. Calappa philargius (L.) 



Cancer philargius, Linn. Mus. Lud. Ulr. p. 432, and Syst. Nat. ed. xii. I. ii. 

 1042 : Herbsfc, Krabben, I. ii. 203. 



Cancer inconspectus, Herbst, Krabben, II. ii. 162, pi. xl. fig. 3. 



Calappa cristata, Fabricius, Ent. Syst. Suppl. p. 346 : Latreille, Hist. Nat. 

 Crust, et Ins. V. 393: Milne-Edwards, Hist. Nat. Crust. II. 105, pi. xx. figs. 1, 2: 

 Stimpson, Proc. Ac. Nat. Sci. Philad., 1858, p. 62 : Ortmann, Zool. Jahrb., Syst. 

 etc., VI., 1892, p. 565. 



Calappa inconspecta, Bosc, Hist. Nat. Crust. I. 185. 



Calappa philargius, De Haan, Faun. Japon. Crust, p 71, pi. xix. fig. 1 : E, 

 Nauck, Zeits. Wiss. Zool., XXXIV. 1880, p. 46 (gastric teeth) : de Man, Arcliiv. 

 fur Naturges., LIU. 1887, i. p. 388, and Journ Linn. Soc, Zool., Vol. XXII. 1888, p. 

 196: J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 396. 



The extreme length of the carapace is two-thirds the extreme 

 breadth. 



Differs from G. lophos only in the following characters : — 



(1) there is a large tooth in the middle of the posterior border, 

 and the tooth bounding that border on either side is more salient: 



(2) the endostomial septum, instead of being deeply excised an- 

 teriorly, has its anterior border strongly convex and projecting. 



Mergui, Andamans, Ceylon, Persian Gulf. 



In the young the teeth of the posterior and postero-lateral borders 

 are more prominent and less oblique ; and the carapace is traversed fore 

 and aft by 7 or 8 rows of sharp tubercles. 



150 



