2 Major A. Alcock and Capt. A. R. S. Antlerson on 



A. Alcock.— Ann. & Ma?;. Nat. Hist., ^rarcli 1894, 

 ])p. 225-245 ; April l.s»J4, i)p. 321-334 ; May 181)4, pp. 400- 

 411 ; J. A. S. B. vul^. Ixiv., Ixv., and Ixvii. pt. 2, 1895, 

 189(5, 1898. 



A. Alcock and A. R. S. Anderson.— J. A. S. B. vol. Ixiii. 

 pt. 2, 1894, pp. 141-185, pi. ix. 



A. R. S. Anderson.- J. A. S. B. vol. ixv. pt. 2, 1896, 

 pp. 88-106. 



J. R. Henderson.— J. A. S. B. vol. Ixv. pt. 2, 1896, 

 pp. 516-536. 



Many of the .species described in these papers have been 

 fio-ured in thirty- live plates of " Illustrations of the Zoology 

 of the * Investigator,' " published in the years 1892-1898. 



In the present paper we offer a list of 92 species of deep- 

 sea Crustacea obtained by the * Investigator ' between the 

 months of October 1897 and April 1898. Of these species 

 31 appear to be new to science and 12 more new to the 

 Indian record. This brings the number of species of Crus- 

 tacea known to inhabit the depths of the Indian seas to 

 something over 230. 



Among the more interesting of our new finds are : — 

 (1) Pentacheles sculptus, a species that also inhabits the 

 depths off the Atlantic coast of the United States ; (2) a 

 species of Richardina (a genus allied to Stenopus) differing 

 very little from the type of the ' Travailleur ' expedition; 

 (3) a true Pylocheles^ so much like the Caribbean species 

 described by M. A. Milne-Edwards, that we at first thought 

 it to be the same ; (4) a Munidopsis that is quite certainly 

 the same as the ' Travailleur ' Galathodfs rosaceus figured by 

 M. A. ]\Iilne-Edwards ; (5) a lloniola having the same 

 " macrurous " carapace as the Mediterranean //. Guvieri and 

 very closely related to that species ; (U) a curious primitive 

 Dromioid having the same branchial formula as the Caribbean 

 JIoDiolodromia of A. ^Milne-Edwards (not the llomalodromia 

 of Miers), and seeming, in fact, to differ irom the Caribbean 

 form only in having orbits like those of Drontia ; (7) a species 

 of the Corystoid genus Trachycarcinus — a genus only known 

 hitherto from off the Pacific coast of Central America ; (8) two 

 species of the Lithodoid genus Paralomis ; (9) a Pinnoteres 

 inhabiting a species of Lima dredged in 430 fathoms. 



Of all the dredging-stations of this season the most prolific 

 was one a few miles to the south-west of Wadge Bank, the 

 exact position being 7° 17' 30" N., 76° 54' 30" E., the depth 

 430 fathoms, and thecoricctcd bottom-temperature " 38°Fahr." 

 — though we susi)cct there is some mistake about the tempe- 

 rature, and that 38° is a clerical error for 48°. A preliminary 



