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



Maxti^eds. — The outer plate lias a smooth inner margin, the spine-teeth being set 

 back at a little distance, although distally projecting beyond it ; the palp's short finger 

 has several setules on the inner margin near the base of the very acute nail, which is 

 nearly as long as the basal part of the joint. In general these organs agree well with the 

 description given by Boeck. 



Gnathopods. — To the figures of these given by Goes Schneider objects that the 

 lower hinder angle of the third joint is represented as rounded, " whereas in reality it is 

 very sharply right-angled," but in the Challenger specimen, though this angle is 

 scarcely to be called rounded, neither is it to be called sharply right-angled. One of 

 the second pair of gnathopods in this specimen has the hand and finger so abnormal that 

 had the other member of the pair been wanting this accident might have led to the 

 institution of a new species. 



Pleop>ods. — The cleft spines are very strong ; the series numbers seven in the first 

 pair, six in the second, five in the third. 



The Telson is rather deeply concave or boat-shaped above, apically a little emarginate 

 as well as serrate. 



Length. — The larger specimen measured, from the front of the head to the end of 

 the third pleon-segment, half an inch, and from the end of the third pleon-segment to the 

 extremity of the uropods, a cjuarter of an inch, this part of the pleon being bent at right 

 angles to the rest of the body in the specimen measured. 



Locality.— Station 49, south of Halifax, Nova Scotia, May 20, 1873 ; lat. 43° 3' N., 

 long. 63° 39' W.; depth, 85 fathoms; bottom, gravel, stones; bottom temperature, 35°. 

 Two specimens, females. 



Halirages huxleyanus (Sp. Bate) (PI. LXXIII.). 



1862. Atylus Huxleyamts, Spence Bate, Brit. Mus. Catal. Ampli. Crust., p. 135, pi. xxv. fig. 4. 

 1870. ,, 1 Batei?, Cunningham, Trans. Linn. Soc. Lond., vol. xxvii. p. 498. 

 1870. ,, Huxleyanus, Cunningham, Trans. Linn. Soc. Lond., vol. xxvii. p. 498. 



A short acute rostrum ; head and perseon as far as the sixth segment dorsally 

 rounded ; back of perseon with an imbricated appearance, postero-lateral angles of the 

 three last segments acutely produced backwards ; the sixth and seventh segments of 

 the peraeon and first three of the pleon produced backwards dorsally in large pointed 

 processes, that on the second pleon-segment being the longest ; the three first segments 

 of the pleon dorsally carinate, with their postero-lateral angles produced in short sharp 

 points. There are markings on the integument, described by Mr. Spence Bate as " some- 

 what resembling the representation of a flying bird." 



Eyes round, of moderate size, dark coloured in the specimen preserved in spirits, 

 the numerous ocelli long, so as to present a broad outer ring, uncoloured. 



