Parelasmopiis, Cheirocratiis 417 



27. Gen. Parelasmopus Stebb. 



1888 Parelasmopus (Sp. un. : P. suluensis), T. Stebbing in: Rep. Voy. Challenger, 

 /•. 29 p. 1029. 



Head without rostrum. Antenna 1 tbe longer, accessory flagellum small. 

 Upper lip rounded. Lower lip witb inner lobes. Mandible normal except 

 as to palp, wbich is sleuder and bas tbe 2^ Joint smaller tban either 1^* or 3^. 

 Maxilla 1, inner plate witb few setae, outer witb 7 spines. Maxilla 2, inner 

 plate fringed on distal part of inner margin. Maxillipeds normal, but spine- 

 teetb on apex of inner plate uncertain. Gnatbopods 1 and 2 subcbelate, 

 2^ witb 6^^ Joint in ö very large. Peraeopods 3 — 5, 2*^ Joint expanded. 

 Uropod 3 not reachiug beyoud tbe otbers (Dana). Telsou small, deeply cleft. 



1 species. 



-1. P. suluensis (Dana) 1852 Gammarus s., J.D.Dana in: P. Amer. Ac., v.2 

 p. 210 i 1853 & 55 G. s., J. D. Dana in: U. S. expl. Exp., v. 13 ii p. 947; t. 65 f. 3 | 1862 

 Megamoera s., Bäte, Cat. Amphip. Brit. Mus., p. 230 t. 40 f. 6 ] 1888 Farelasmojms s., 

 T. Stebbing in: Rep. Voy. Challenger, «.29 p. 1029 t. 100. 



Peraeon segment 7 and pleon segments 1 and 2 eacb witb bind 

 margin dorsally produced into a pair of teetb, segment 3 dorsally emarginate, 

 segment 4 witb 2 pairs of upward curved teetb, segment 6 very short. Head 

 witb no rostral point, lateral lobes rounded, post-antennal corners acute. 

 Side-plates 1 — 4 moderate in deptb, 1^* a little distal ly outdrawn. Pleon 

 Segments 1 — 3, postero-lateral corners acute, in segment 3 produced upward, 

 witb adjacent lower margin serrate in 4 or 5 teetb. Eyes large, oval, close to 

 lateral lobes of bead. Antenna 1 mucb tbe longer, 2^ Joint ratber longer tban 1^*, 

 3'Mess tban \'o as long as 2*^, flagellum witb more tban 17 Joints, accessory 

 tlagellum witb 2 slender joints. Antenna 2 slender, gland-cone reacbing end of 

 antepenultimate Joint, ultimate long, but sborter tban penultimate, flagellum 

 1 0-Jointed. Mandibular palp not so long as tbe truuk, l*** and 3*^ Joints equal, eacb 

 twice or more tban twice as long as 2^, 3^ slightly tapering. Gnatbopod 1, 5*^ Joint 

 nearly as long as 6*^, 6^^ oblong, witb oblique row of 20 spines on inner 

 surface, palm sligbtly oblique, flnely denticulate. Gnatbopod 2 in d, 5*^ Joint 

 sliort, cup-sbaped, broader tban long, 6^^ mucb broader, twice as long as 

 broad, witb oblique, irregulär palm, baving a spinöse prominence near binge 

 of finger, tben 4 emarginations and on eitber side of tbe last of tbem 2 processes 

 of tbe inner surface adapted to receive tbe fiuger-tip. Peraeopods 3 and 4, 

 2^ Joint broader above tban below, 4*^ moderately broad. Peraeopod 5, 

 2^ Joint oval. Uropods 1—3 reacbing equally far (Dana). Telson scarcely 

 longer tban broad, cleft nearly to base, lobes divergent, eacb witb bidentate 

 apex, outer tootb tbe longer, 2 unequal spines inserted between tbe teetb. L. about 

 8 mm. 



Sooloo Sea (between Cape York and the Arrou Islands). Depth 16 m; among 

 sea-weed floating off the shore. 



28. Gen. Cheirocratus Norm. 



1862 Liljeborgia (part.), Bäte (& Westwood), Brit. sess. Crust., v. 1 p. 202 | 1867 

 Cheirocratus (Sp. un.: C. mantis), A. 31. Norman in: Nat. Hist. Tr. Northumb., v. 1 

 p. 12 i 1876 C, A. Boeck, Skand. Arkt. Amphip., v.2 p. 395 | 1893 C, A. Della Valle 

 in: F. Fl. Neapel, r. 20 p. 687 ] 1894 C, G. 0. Sar.s, Crust. Norway, v.l p. 523. 



Pleon Segments 4 and 5 dentate, 4*^—6*'^ araied witb bristles. Head 

 not rostrate, lateral corners obtusejy lobed, post-antennal augles projecting 



Das Tierreich. 21. Lief. : T. R. R. Stebbing, Amphipoda I. 27 



