288 Chosroes, Sancho 



than inner; uropod 3, ranii equal, broadly lanceolate, inner with spiues and 

 setae ou both margius. outer with spines and setae on inner, groups of spines 

 on outer margin. Telson as long as peduncle of uropod 3, not twice as 

 long as broad, a short triangulär notch separating 2 ]-ounded apices, sides 

 convex in young, slightly concave in adult. L. 10 mm, 



Strait of Magellaii (Caj)e A'irgins). Depth 100 — 128 m. 



3. Gen. Sancho Stebb. 



1897 Sancho (Sp. un.: S. platynotus), T. Stebbing in: Tr. ijinii. Soc. Lüiidon, 

 ser. 2 V. 7 p. 42. 



Back of peraeon Itroadly vaulted, with side-plates laterally outspread, 

 pleon narrow, segments 3 — 6 folded under. Head with angular front. Eyes 

 dorsal, separate. Antenna 1 with short peduncle, accessory flagellum small, 

 1-jointed. Antenna 2 not niuoh longer than antenna 1. Upper lip broader 

 than long. Lower lip without inner lobos. Mandible. cutting edge, accessory 

 plate and spine-row small, molar and palp powerful. Maxilla 1, inner plate 

 with 2 setae, outer with 11 spines, small and inconspicuously denticulate. 

 Maxilla 2, inner plate broader than outer, not fringed on inner margin. 

 Maxillipeds, inner plates l)road, outer smaller than, and scarcely reaching 

 beyond, the inner, palp well developed, finger small. Gnathopod 1 (Fig. 72) 

 feeble, subchelate. Gnathopod 2 in Q similar to gnathopod 1. in d (Fig. 73) 

 very elongate, with 6*^ Joint massive. Peraeopods 1 — 5 normal, o^'^ the 

 longest. Uropods 1 — 3. outer ramus shorter than inner. Telson small, entire, 



1 specios. 



1. S. platynotus Stebb. 1897 S. j^-, '^- Stebbing in: Tr. Linn. Soc. London, 

 ser. 2 V.7 p. 42 t. 9A. 



Peraeon segment 1 very short, segment 7 longer; flexing of pleon 



begins at the 2*^ segment. Head dorsally flattened. Side-plate 1 distally a 



little widened, 4**^ the largest, emarginate behind, serrulate below the excavation. 



Fig. 72. Pleon Segments 1 and 2, postero-lateral cörners 



ininutely produced. Fiyes round, wide apart on top 



of head, liglit pinkish in spirit. Antenna 1, l***^ Joint 



longer than 2*^ and 3*^ combiued. flagellum in d 



4 times as long as peduncle, with 41 joints, the 1^* 



slightly longer than 3<i Joint of peduncle, and longer 



than accessory flagellum. Antenna 2, ultimate 



Joint of peduncle longer and thinner than pen- 



2« Joint 5"' Joint ultimatc, both spinöse, flagellum nearly as in 



^'s- ^^- antenna 1. but setuliferous. Upper lip, distal 



Fig. 72 & 73 s platynotus, j. ,uargin almost straight. Mandible, 3^ Joint of 



Gnathopods l and 2. , "^ , ca • ^ -^t ■ ui- 



palp as long as 2^ wide, with spines on oblique 

 apex. Maxillipeds, outer plates fringed with slender spines on the inner 

 margin, 3*^ Joint of palp uarrower but not niuch shorter than 2'^ finger 

 Short, tipped with spinules. Gnathopod 1 in d (Fig. 72), 5**» Joint considerably 

 longer and narrower than the 6*'', which is rather longer than broad, palm 

 short, nearly transverse. with small finger to match; in the Q o^^ and 

 6**^ joints narrow, not veiy long, subequal, 6*^ rather the longer. Gnatho- 

 pod 2 in d (Fig. 73), 2^ Joint narrower at base, a little widened near the 

 middle, 5*^ Joint subfusiform, shorter and strikingly narrower than the massive 



