242 Synchelidium 



plates with only a few strong spines. Gnatbopod 1 powerful, ueaiiy as in 

 Pontocrates, but process of 5*^ Joint tipped by a strong spine, palm coarsely 

 deutate. Gnatbopod 2, process of o**^ Joint coalesced witb 6*^^ except near 

 tbe small cbela, in wbicb tbumb and finger are botb narrow. Otber parts 

 in agreement witb Pontocrates. 



4 species. 



Synopsis of species: 



( Blotched with brown — 2. 



\ Pellucid, without pigmentary Ornament — 3. 



j Gnathopod 1, 6tli joint broadly oval 1. S. haplocheles . . p. 242 



\ Gnathopod 1, 6tli Joint elongate oval 2. S. macvilatum . . p. 242 



/ ßostrum much deflexed, lateral corners of head 



J subacute 3. S. tenuimanum . p. 243 



I Rostrum little deflexed, lateral corners of head 

 rounded 4. S. intermedium . p. 243 



1. S. haplocheles (Grube) 1864 Kroyeria h., E.Grube, Lussin, p. 72 ■ 1893 

 Kröyerah. (part.), A.DellaValle in: F. Fl. Neapel, ?;.20 p.553 t.3 f. 15; t.34 f. 35— 39; 

 1868 Kroyera brevicarpa, Bäte & Westwood, ßrit. sess. Crust., v. 2 p. 508 f. | 1892 

 Synchelidium brevicarpum, G. 0. Sars, Crust. Norway, v. 1 p. 318 t. 112 f. 1. 



Not robust, but back broadly rounded. Rosh'um sbort, evenly curved, 

 scarcely reaching beyond middle of 1^* Joint of antenna 1. Eyes ratber large. 

 rounded, brigbt red, witb wbitisb coating. Antenna 1 in Q slender, 1**^ and 2^ joints 

 subequal, 3^ not mucb sborter, flagellum mucb sborter tban peduncle, 5-jointed, 

 in ö 2^ and 3*^ joints sborter and tbicker, flagellum as long as peduncle, its 

 l^*' Joint large, densely clotbed. Antenna 2 in 9 sborter tban antenna 1, ultimate 

 and penultimate joints of peduncle subequal, togetber as long as flagellum. Gnatbo- 

 pod 1, process of 5*^ Joint a little dilated, then tapering, produced considerably 

 beyond bind margin of 6*^^ wbicb is wide at tbe middle, fusiform, palm 

 mucb longer tban bind margin, defined by an angular projection and strong 

 spine, its edge denticulate, 6 of tbe denticles large and blunt (Sars, but 

 scarcely so in Della Valle's Fig.). Gnatbopod 2 ratber slender, 6*^ Joint 

 tbickened at base, tbence tapering, cbela about V5 of its lengtb, a little 

 overtopped by process of 5*ii Joint. Peraeopods 1 and 2 moderately strong, 

 o^^ and 6**^ joints subequal, finger minute. Peraeopods 3 and 4, finger less 

 iusignificaut. Peraeopod 5, 5^^ Joint tbe longest. Uropod 3, rami very 

 sligbtly longer tban peduncle, slender, unarmed. Telson ratber large, oblong 

 oval, apex sligbtly insinuate. Colour wbitisb, variegated witb dark brown, 

 tbis forming ti-ansverse bands on sorae Segments. L. 4 — 5*5 mm. 



North-Atlantic, North-Sea and Skagerrak (South- and West-Norway, Trondhjems- 

 fjord, depth 19 — 56 m; Great Britain); Mediterranean. 



2. S. maculatum Stebb.*) 1893 Kröyera arenaria (err., non Kroyera a. Bato 

 1858!), A. Della Valle in: F. Fl. Neapel, i\20 p. 554 t. 4 f. 1; t. 34 f. 18-34. 



Slender. Eyes red. Antenna 1, 1^* Joint a little longer tban 2<*, 2*^ tban 3*^, 

 flagellum as long as 2^ and 3*^ combined, witb 4 ratber elongate joints. Antenna 2, 

 ultimate Joint of peduncle sborter tban penultimate, flagellum 6-jointed. Gnatbo- 

 pod 1, process of 5*^ Joint reacbing end of bind margin of 6*^ wbicb is 

 ellipsoidal, more tban twice as long as broad, palm longer tban bind margin, 



*) Sp. nov. 



