MUSEUM OF COMPARATIVE ZOOLOGY. 247 



are of slender spatulate shape, evenly rounded at the end, and beautifully and 

 finely serrate. Legs excessively slender and elongated, three and three fourths 

 times the length of the body (with rostrum and abdomen). The proportion of 

 the joints are much as in C. colossea but the tarsus (7thj is more than 

 twice the propodus, and the dactylus is scarcely more than one third the propo- 

 dus. Both tarsus and propodus (Fig. 11) are unarmed. The surface is every- 

 where finely granular. The legs have a lew hairs, arranged as in C. colossea. 

 Color pale yellowish, the stomach showing through as a conspicuous reddish- 

 brown stripe. 



Length of body (including rostrum and abdomen) .... 44.5 mm. 



" rostrum 31 " 



" palpi 35 " 



" accessory legs .' 62 



" ambulatory legs 165 



Extent 343 " 



A single specimen from locality 338, 922 fathoms, N. Lat. 38° 18' 4()", 

 W. Long. 73° 18' 10". 



This wonderfully attenuated species is widely different from the two pre- 

 ceding, from which it is easily distinguishable by its extraordinary rostrum, pe- 

 culiar oculiferous segment, and the proportions of the palpal joints. 



SC^ORHYNCHUS, gen. nov. 



Body conspicuously segmented. Oculiferous segment elongate. Rostrum 

 large, pyrifonn, unjointed. Accessory legs present in both sexes, with eleven 

 joints. " Antennae " four-jointed, chelate. Palpi composed of ten joints. Ab- 

 domen unjointed. Legs slender ; dactylus without auxiliary claws. 



This genus resembles in general appearance Eurycide, Schiodte {Zetes, Kroyer), 

 and forms one of a very distinct group of genera, including Eurycide, Parazctes, 

 Ascorhynchus Gnamptorhynchus, which should perhaps constitute an indepen- 

 dent family. All possess a very characteristic, large, pjTiform, three-sided ros- 

 trum, which is usually directed downwards, and maybe folded backwards under 

 the body. They further agree in the small rudimentary " antennae," well-devel- 

 oped palpi, slender legs, straight and simple tarsus and propodus, absence of aux- 

 iliai'y claws, and in the possession of accessory legs by both sexes. The most 

 marked character of Scceorhynchiis is the presence of strongly chelate " antenna) " 

 ill the male, while in the female the chelae are quite rudimentary. Eurycide, as 

 described by Kroyer and others, has non-chelate, three-jointed " antennae." The 

 form figured in Gaimard's Voyages en Scandinavie, Laponie, etc., as Kroyer's 

 species, appears to have the rudiment of a fourth joint, agreeing with the fe- 

 male oi Scceorynchus ; and it is therefore possible that the two genera do not 

 differ essentially in the structure of the " antennae." The other charactere are, 

 however, quite sufficient to separate them. 



It may be questionable whether our form should be generically separated from 



