642 THE VOYAGE OF H.M.S. CHALLENGER. 



ramus ; the outer ramus broadly lanceolate, with spines on one margin, and ending with 

 a decided nail ; the small branch ending acutely, without a nail, a slender spine on one 

 margin near the apex, and some way above it a cilium ; higher upon the other margin 

 another cilium. 



Telson projecting beyond the peduncles of the third uropods, cleft for more than 

 three-quarters of its length, narrowing distally, where it becomes slightly dehiscent by the 

 curvino- round of the margins of the cleft ; the inner part of each ajsex a little more 

 produced than the outer, and in the hollow a stout spine inserted with a cilium by its 

 side. Near each outer margin, a little below the top of the cleft, the telson has a spine 

 on the surface, and below this one or two feathered cilia, and here and there a simple 

 cilium. 



Length. — The specimen, in the position figured, measured three-tenths of an inch. 



Locality. — Station 149h, off Cumberland Bay, Kerguelen, January 29, 1874 ; depth, 

 127 fathoms ; bottom, volcanic mud. One specimen, female. 



Remarhs. — The specific name, crenatipcdmatus, refers to the palm of the first 

 gnathopods. 



The only other species in this group which has a form of hand similar to that of our 

 species is, so far as I know, Normania latimana, G. 0. Sars, but that species has been 

 only provisionally assigned to Boeck's genus Normania, with which, as defined by its 

 author, neither that species nor this agrees. The mouth-organs of Normania latimana 

 have not yet been described, so that I cannot say whether it belongs or not to the genus 

 now instituted. 



Genus Platamon, n. gen. 



Mandibles with the palp set forward over the dentate crown of the molar tubercle. 



First Maxillw with the inner plate oval, carrying two plumose setee, the second 

 joint of the palp greatly expanded, with numerous teeth on the apical border. 



Second Maxilla} with the inner plate broader than the outer, its inner border 

 fringed as weU as the apical. 



Maxillipeds with the inner plates remarkably broad, the outer plates with numerous 

 teeth on the inner border, and two closely adjacent to the rest on the apex. 



Both pairs of Gnathopods long and slender, with the fingers well-developed, the hand 

 in the first gnathopods shorter than the wrist, oval, subchelate. 



Tliird Uropods with the rami as long as those of the second. 



Telson divided beyond the centre, extending beyond the peduncles of the third 

 uropods. 



The generic name is derived from the Greek word TrXaTajj-av, a broad space, in allusion 

 to the great breadth of the parts of the maxillae and maxillipeds above described. 



