Laothoes, Chosroes 287 



bind raargin. Uropod 3, rami about twice as long as peduncle, fringed with 

 spinulcs only. Telson oval quadraiigular, with apex broad, faiiitly emarginate. 

 Colour pellucid, yellowisb, indistinctly banded with orange; ova in pouch 

 pale violet. L. 9 8 mm. 



Arctic Ocean, Nortli-Atlantic and Xorth-Sea (Hardangertjord, depth 565 — 942 m ; 

 Trondhjemsfjord; Nordland). 



L. carcinophilus (Chevreux) 1889 Paramphithoe carcinophild, Chevreux in: 

 Bull. Soc. zool. France, v.l4 p.288 f. [ 1893 P. c, Acanthozone?, A. Della Valle in: F. Fl. 

 Neapel, ii 20 p. 619. 



L. 7 mm. 



North-Atlantic (Azores, between Pico and San Jorge, depth 620 m, and off 

 Floreg, depth 1386 m). From the carapace of Gerjon sp. 



2. Gen. Chosroes Stebb. 



1888 Chosroes (Sp. un.: C. incisus), T. Stebbing in: Rep. Voy. Challenger, 

 V. 29 p. 1208. 



Hack of peraeon broadly vaulted in front, with side-plates laterally out- 

 spread, pleon segments 4 — 6 folded under, 5^^ and 6*'' not very short. Head, 

 rostrura minute. Side-plate 1 small. Autenna 1 the sborter, without accessory 

 flagellum; both 1^* and 2*^ antennae calceoliferous. Upper lip rouuded. Lower 

 lip without inner lobes. Mandible normal, palp very large, 3^ Joint longer 

 but narrower than 2'^. Maxilla 1, inner plate with 2 or 3 setae, outer with 

 11 spines. Maxilla 2, inner plate only partially fringed on inner margin. 

 Maxillipeds, outer plates scarcely reaching middle of palp's 2*^ Joint, inner 

 margin fringed with submarginal spinules, palp rather elongate, tinger short 

 with a Short shai"p nail. Gnathopods 1 and 2 small, similar, 5*^ Joint rather 

 elongate, palm rather short, slightly oblique. Peraeopods 1 and 2, 2*^ Joint 

 partially dilated; peraeopods 3 — 5, expanded 2'^ Joint notched, 4^^ Joint in 

 all broad, not long. Uropods 1 and 2, outer raraus the sborter; uropod 3, 

 rami subequal, lanceolate. Telson slightly notched. 



1 species. 



1. C. incisus Stebb. 1888 C. i., T. Stebbing in: Rep. Voy. Challenger, v.29 

 p,1209 1. 134, 135 I 1893 Acanthozone incisa, A. Della Valle in: F. FI. Neapel, «.20 p. 614 

 t. 59 f. 26. 



Body dorsally very wide at middle of peraeon, pleon segment 6 

 cpnsiderably longer than b^^. Side-plate 4 deeply emarginate, 5*'' broad, 

 the lobes about equal in depth, Eyes broadly oval, wide apart, lenses 

 numerous. Antenua 1, 1^* Joint stout, a little longer than 2*^, and 2^ than 3*^, 

 flagellum about twice as long as peduncle, with raore than 34 joints, short, 

 distally a little widened, these and last 2 joints of peduncle with raany small 

 calceoli. Antenna 2 decidedly longer, ultimate Joint of peduncle longer than 

 penultimate, flagellum longer than peduncle, with more than 24 joints, short, 

 laroad, calceoliferous. Triturating lobes at eutrance of stomach with short 

 curved and long straight spines. Gnathopod 1, 5**^ Joint somewhat expanded 

 in the middle, 6^^ equally long, broader, oval, palm slightly convex, shorter 

 than bind margin, defined by a group of palmar spines. Gnathopod 2 similar 

 but more elongate. Peraeopods 1 and 2, 2^ Joint expanded iuto a broad 

 lobe near but not at the apex, 5*^ Joint longer than 4*^ 6*^ than 5*^>, finger 

 short. Peraeopods 3—5, 2^ Joint broad, bind margin deeply notched below 

 the middle. Marsupial plates large. Uropods 1 and 2, outer ramus sborter 



