DECAPODA. 213 



Hymenodora glacialis (Buchholz) ? 



Macerated fragments from haul 26 b, 2000-1500 fathoms, may almost certainly be 

 referred to this species. If coi'rectly determined, the record marks the most southern 

 limit in the known distribution of the species. 



UnknoAvn larva allied to Caricyphus, Spence Bate. (PL 15. figs. 2-8.) 



The whole animal is strongly laterally compressed ; the rostrum unarmed and slender 

 and about two-thirds the length of the carapace. The carapace itself is more than three 

 times as long as deep, carinate on its anterior third and furnished with a blunt spinule 

 behind the orbital notch ; it is extended as an acute point above the insertion of the 

 antennae and the anterior basal edge is marked by a short slender spine. 



The last four abdominal somites are dorsally carinate, the 3rd is very pronouncedly 

 elbowed, the segment extending to an acute hump, forming a most prominent feature in 

 side view ; the 6th somite is rather more than two and a half times the length of the 5th. 

 The telson (fig. 8} is almost twice the length of the 6th somite, apically it is rather broad, 

 somewhat truncate, and furnished with five pairs of spines, the second pair counting from 

 the outer edge being very much longer than the rest. Laterally it bears five or six pairs 

 of spinules. 



The eye is not one-third the length of the carapace ; the cornea is very large, somewhat 

 elliptical, and set obliquely on the stalk. The basal joint of the inner antennoe reaches 

 to the distal extremity of the eye ; proximally the segment is laterally expanded and in 

 larger specimens there is a small acute point projecting forwards forming the first 

 beginnings of the lateral process. On the inner side of the joint at about its middle are- 

 set three rather long forwardly directed spines. The 2nd joint is somewhat longer than 

 the 3rd and the oviter flagellum is at its base considerably stouter than the inner. The 

 antennal scale reaches slightly beyond the peduncle of the inner antennae ; it is narrow 

 and bears the usual spine at its outer distal edge. 



The mandibles (fig. 3) show both molar and cutting edges, the latter being furnished 

 with three strong teeth. In the first maxillae (fig. 4) the basal lobe is broad and bears 

 many setae, the upper lobe l)eing narrower and provided with stiff bristles. The endopod 

 is one-jointed and is furnished apically with three stout setae, while from a tubercle on 

 the inner side two others arise. The basal portion of the second maxilla (fig. 5) is 

 internally trilobed and setiferous ; the endopod is short, one-jointed, and bears apically 

 five or six setae, while two or three others are situated on two prominences on the inner 

 aspect. The exopod is long and narrow, externally it is slightly concave ; the anterior 

 lobe projects forward about twice the length of the endopod, the narrow posterior lobe 

 being about half its length. The margin is uniformly clothed with fine setae. 



Both basal joints of the first maxillipede (fig. 6) are broad, the second being densely 

 clothed with setae on its inner edge ; the endopod is three-jointed and bears few setae. The 

 exopod is slender, about three times the length of the endopod ; it is divided distally into 

 several annulations. The epipod is bilobed, the lower lobe being the larger. The second 

 maxiUipedes (fig. 7) possess a five-jointed endopod, an exopod which is slightly shorter 



SECOND SERIES. — ZOOLOGY, VOL. X. 36 



