254 BULLETIN OF THE 



Nymphon pallenoides, Sars. 



Crustacea ct Pycnogouida nova in Itinere 2*° et 3"° Expeditionis Norvegicae Anno 

 1877 et '78 collecta (Prodromus Descriptionis) < Arcliiv for Mathematik ogNatur- 

 videnskab, Fjerde Bind, Fjerde Hefte, p. 470. 



Plate III. Fig. 14. 



I have, with some hesitation, referred a single specimen in the collection to 

 Sars's species. While agreeing much more nearly with it than with any other 

 known form, it differs in certain slight characters. These differences probably 

 fall, however, within the limits of variation. 



The body is robust, the lateral processes short, and separated by rather small 

 intervals. Oculiferous segment nearly as in N. Strbmii, i. e. constricted in the 

 middle, swollen in front and slightly emarginate between the bases of the an- 

 tennae. Oculiferous tubercle conical, rather low. Ocelli of unequal size, as in 

 Fallenopsis, of a dark chestnut-brown color. Rostrum cylindrical, scarcely as 

 long as the oculiferous segment. 



ChelsE of " antennae " with rather long much curved claws, armed along 

 their opposable margins with about seventeen strong, slightly curved, oblique, 

 well separated spines, most of which are of a brownish color ; they cease ab- 

 ruptly at some distance from the tip. 



Palpi rather small. Basal joint very short ; second and third longest, nearly 

 equal ; fourth and fifth equal, one half the third. 



Accessory legs of the usual structure ; spines rather blunt, and with the 

 serrations irregular and ill-defined. Legs with the fourth joint rather swollen 

 and fusiform ; sixth joint longest, very slender. Tarsus about one half the pro- 

 podus, somewhat expanded at its distal end. Propodus (Fig. 14) gently curved. 

 Both joints are armed along the lower margin with rather weak, crowded, ap- 

 pressed spines. Dactylus more than one half the propodus, very acute, flat- 

 tened, with a thin knife-like edge. Auxiliary claws very slender, one fourth 

 to one third the propodus. 



The body and appendages are rather hairy, though less so than in N. hirtum. 

 The legs are rather robust. 



This is a peculiar species, looking like a Pallenc. Its distinctive characters 

 are the unequal size of the ocelli, short neck and rostrum, small palpi, short 

 tarsus, and flattened dactylus. Its nearest ally is, perhaps, N. hirtum. 



Length of body (including rostrum and abdomen) 7.8 mm. 



" rostrum 2.4 " 



legs 28.0 " 



A single specimen from locality 338, N. Lat. 38° 18' 40", W. Long. 73° 18' 

 10", 922 fathoms. Sars's single specimen was from " Saltenfjord." 



