218 



on each segment from the IXth (external maxillipeds) to the Xlllth, and a 

 pleurobranch on somite XIII (penultimate thoracic). The gill-elements are 

 filaments arranged in double rows on either side of a shaft (quadriserial). 



In the female the genital opening is present on the left side only. 



Eggs small and numerous. 



Key to the Indian species of Parapagurus. 



I. The ophthalmic scales are simply spiniform : 



1. The adult is large : the chelipeds are thickly pilose, the larger 



one of the right side being at least 3 times as long as the 



carapace ... ... ... ... ... P. pilosimnnus. 



2. The adult is minute : the chelipeds are glabrous and the larger 



one (right) is much less than 3 times the length of the cara- 

 pace ; the outer surface of the hand of the larger cheliped is 

 longitudinally traversed near the upper border by a fine 

 granular ridge ... ... ... ... P. minutus. 



II. The ophthalmic scales have the tip serrated : 



1. The hand forms about a third of the length of the enlarged 



right cheliped, in which the palm is a subquadrangular joint 



about twice as long as broad ... ... ... P. andersoni. 



2. The hand forms about two-fifths of the length of the enlarged 



right cheliped, in which the palm is a suboval joint not 



much longer than broad ... ... ... ... P. andersoni var. 



brevimaniu. 



3. Parapagurus pilosimanus, S. I. Smith. 



Parapagurus pilosimanus, S. I. Smith, Trans. Connect. Acad. V. 1879, p. 51, and Proc. U. S. Nat. Mns. III. 

 1881, p. 428 and VI. 1883, p. 33, pi. v. figs. 3-5 and pi. vi. figs. l-4a, and Bull. Mua. Comp. Zool. X. 1882-83, p. 20, 

 pi. ii. fig. 4, and Report U. 8. Fish. Comm. 1884 [p. 10], and 1886 [p. 39] : Pocock, Ann. Mag. Nat. Hist. (6) IV. 

 3889, p. 430 : A. Milne Edwards and E. Bouvier, Ann. Sci. Nat. Zool. (7) XIII. 1892, p. 204, and Mem. Mas. Comp. 

 Zool. XIV. 1893, No. 3, p. 28, and "Hirondelle" Brachyures et Anomnres (Monaco, 1894) p. 64, pi. ix. figs. 1-17. 

 and " Hirondelle" Crnst. Decapodes (Monaco, 1899J, p. 55, pi. i. fig. 1 (var. abyssorum) : and Caullery, " Candau " 

 Croat., Ann. Univ. Lyon, 1896, p 386. 



Eupagurus jacobii, A. Milue Edwards, Bull. Mas. Comp. Zool. VIII. 1880, p. 42. 



Parapagurus abyssorum, Henderson, Challenger Auoinura (1888), p. 87, pi. ix. fig. 2 : Wood-Mason, Ann. Mag. 

 Nat. Hist., Feb. 1891, p. 199. 



Parapagurus pilosimanus abyssorum, Faxon, Mem. Mus. Comp. Zool. XVIII. 1895, p. 68. 



Carapace strongly calcified in the gastric and hepatic regions, less strongly 

 in the narrow cardiac region, parchment-like in the branchial regions ; the rostral 

 prolongation broad, little prominent, and rounded off ; the posterior border deeply 

 excavated in the middle line on account of the bulging of the branchial regions : 

 on the sides, and in the region of the conspicuous cervical groove are some tufts 

 of seta3. 



The abdominal terga, except the first two which are parchment-like and the 

 last two which are strongly calcified, are narrow and widely separated from one 



