( 99 ) 



The gills are trichobranchias, and are ii in number on either side, 

 disposed as follows :— a pair of arthrobranchiae on each segment from the IXth 

 to the Xlllth and a pleurobranch on somite XIII. Each gill. plume consists of 

 four rows of filaments. 



The species of Parapagurus live in cold water, and are found either in 

 the great depths of the oceans (Atlantic, Indian, and Pacific) or in the colder 

 parts of temperate seas : of the 8 species known, 6 are abyssal or sublittoral, 

 and only two belong to the littoral zone. 



Key to the Indian species of the genus Parapagurus. 



I. Ophthalmic scales simple, acute : — 



A. Adult large ; chelipeds thickly tomentose : eyestalks barely 



half as long as front border of carapace ^ ... P. pilosimanus. 



B. Adult small : chelipeds not noticeably tomentose : eyestalks 



more than half as long as the front border of the carapace P. minutus. 



II. Ophthalmic scales serrated at tip : — 



/i. Right cheliped about 3| times as long as the carapace, its 



palm twice as long as broad ... ... ... P. andersoni. 



B. Right cheliped about 2f times as long as the carapace, its 



palm about as broad as long ... _ ... P, brevimanus. 



I. Parapagurus pilosimanus, S. I. Smith. Plate X., iig. i. 



Parapagurus pilosimanus, S. I. Smith, Trans. Connect. Acad. V, 1879, p. 51; and Proc. 

 U. S. Nat. Mus. Ill, 1881. p. 428, and VI. 1883, p. 33, pi. v., fig. 3—5, and pi. vi., fig. 1_4 a; 

 and Bull. Mus. Comp. Zool. Harvard, X, 1882-83, p. 20, pi. ii, fig. 4 ; and Report U. S. 

 Fish. Comm. 18S4 [p. 10], and 1886 [p. 39]; and Ann. Mag. Nat. Hist, (5), XVlI, 1886, 

 p. 188: Pocock, Ann. Mag. Nat. Hist. (6) IV, 1889, p. 430: A. Milne Edwards and Bouvier, 

 Ann. Sci. Nat. Zool. (7) XIII, 1892, p. 204; and Mem. Mus. Comp. Zool. XIV, No. 3, 



1893, p. 28; and Hirondelle Brach. et Anom. (Monaco, 1894), p. 64, pi. ix., fig. I 17, 



and Hirondelle et Princesse Alice Crust. Decap. (Monaco, 1899), p. 54; and Crust. Decap. 

 Travailleur et Talisman, Pt. I, 1900, p. 187, pi. vi., fig. 2, and pi. xxiv., fig. 1—3; Caullery, 

 Caudan Crust., p. 386, 1896. 



Eupagurus Jacobii, A. Milne Edwards, Bull. Mus. Comp. Zool. VIII, 1880, p. 42. 



Parapagurus abyssorum, Henderson, Challenger Anomura, 1888, p. 87, pi. ix., fig. 2: Wood- 

 Mason, Ann. Mag. Nat. Hist. Feb. 1891, p. 199: Faxon, Mem. Mus. Comp. Zool. XVIII, 

 No. 15, 1895, p. 68 : Milne Edwards and Bouvier, Crust. Decap. Hirondelle et Princesse 

 Alice, Monaco, 1899, p. 55, pi. i., fig 1, and Crust. Decap. Travailleur et Talisman, Pt. I., 

 1900. p. 191, pi. xxiv., fig. 4-6. 



After carefully comparing Indian specimens, of which we have a large 

 series, with two "Challenger" specimens from the East Atlantic and three 

 specimens from the West Atlantic, I can find no constant differences 

 between them. 



