487 



and is generally found in depths varying from 30 to 100 fathoms. It is 

 extremely brittle, and it is not easy to get a specimen with all its 

 appendages uninjured. - Out of Norway, it has not yet been recorded. 



Gen. 2. Melphidippella, G. 0. Sars, n. 

 Syn : Melphidippa, Boeck (part.) 



Body of a form similar to that in the preceding genus, having some 

 of the posterior segments spinous. Cephalon comparatively deep and much 

 swollen, with the lateral corners terminating in a sharp point. Coxal plates 

 very small. Eyes extremely large and prominent, with well-developed visual 

 elements. Antennae very slender, the superior ones (in female) longer than 

 the inferior, and having the accessory appendage quite rudimentary; those in 

 male with the opposite edges of the peduncles densely ciliated, the inferior 

 ones being much more fully developed than in female. Oral parts of a similar 

 structure to those in the preceding genus, except that the terminal joint of the 

 mandibular palps is very small, and the palps of the maxillipeds of inferior 

 size. Both pairs of gnathopoda slender and feeble in structure, with the 

 carpus but little expanded. The 2 anterior pairs of pereiopoda extremely 

 slender, nearly setiform, with the dactylus very small; the 3 posterior pairs 

 about as in Melphidippa. Last pair of uropoda rather elongated, with the 

 basal part somewhat laminar, and the rami subequal. Telson triangular, 

 deeply cleft. 



Remarks. The present new genus is founded upon the form at 

 first announced by Mr. Norman as Atylus macer, and subsequently described 

 by Boeck under another name, viz., Melpliidippa longipes. Though evidently 

 nearly related to the species of the preceding genus, this form has been 

 found, on a closer examination, to differ in some points rather markedly, so as 

 more properly to be regarded as the type of a separate genus. For instance the 

 accessory appendage of the superior antennae is so very small as nearly to be 

 obsolete, and ' the eyes, which in the species of the preceding genus are 

 rather poorly developed, distinguish themselves both by their extraordinary 

 size, and by the very full development of the visual elements. Moreover there 

 are to be found some differences both in the structure of the oral parts, and in 

 that of the legs. The genus comprises, as yet, but a single species, to be 

 described below. 



