102 "TERRA NOVA" EXPEDITION. 



organism or other floating ohject. The surface of its body is not hairy, but this may 

 be due to immaturity, or the hairs may have been rubbed off. There are traces of 

 longish hairs on the legs. 



One specimen, Station 109. 



Family MAIIDAE. 

 Sub-family INACHINAE. 



Genus ECHINOMAIA, n. gen. 



Two male specimens, dredged in 100 fathoms north of New Zealand, belong to a 

 species new to science, related to those of Cyrtomaia and Platymaia, but differing from 

 each of them in points which appear important enough to demand the institution of a 

 new genus for its reception. This may be diagnosed as follows : — 



Carapace subpyriform, as broad as long, with well-marked and somewhat swollen 

 regions, naked, porcellanous, sprinkled irregularly with granules of various sizes, and 

 bearing also large and small, blunt spines. Sternum and abdomen also sprinkled with 

 granules, among which small, sharp spines are regularly arranged. Abdomen of male 

 seven-jointed. Rostrum three-toothed ; its middle tooth a spout-like outgrowth of the 

 interantennulary septum directed obliquely downwards ; its other two teeth sharp, 

 hooked, and standing erect on the hood-like antennulary fossettes. Eye-hood 

 prominent. No pre- or supra-ocular, but a strong postocular spine, not hollowed to 

 receive the eye. Epistome broader than long, concave, lozenge-shaped. Edges of 

 mouth-frame projecting strongly, and rising at each outer angle into a lobe. Eyestalks 

 long ; cornea somewhat ventral, bearing a papilla at the end and [2] others on the 

 upper side. Basal joint of antenna of moderate width, reaching fore edge of eye-hoocl, 

 not fused with surrounding structures, but firmly fixed ; its ventral side flat, bearing at 

 end two jagged lobes ; last two joints of stalk spreading on their outer sides each into 

 a large, leaf-like flange [flagella wanting in both specimens]. Third maxilliped 

 subpediform, merognathite being narrower than ischiognathite and palp strong ; 

 exognathite well developed and only its flagellum hidden. Legs long, slender, 

 subcylindrical, with compressed end-joints ; first two bearing many sharp spines, fourth 

 smooth [fifth wanting in both specimens]. Chelipeds shorter than walking legs, 

 stouter, though still slender, and more spiny. Hands narrow, subprismatic, with 

 fingers bent somewhat downwards on palm. 



In the shape of the rostrum and the compression of the last joint of the walking 

 legs, Echinomaia resembles Platymaia. The profile of its carapace is much like that of 

 P. turbynei, Stebb., 1902. In regard to the eyes, the spines of the carapace, and the 

 shape of the hands, it is more like Cyrtomaia. In the stalk of its antenna it diff'ers 

 considerably from both genera. Echino-plax appears to be a related genus, and so 

 perhaps is Macrocheira. It would be interesting to know the habits of this remarkable 

 group of crabs, Ijut on account of their deep-water habitat little more than conjecture 



