66 



beyond the middle, the apical border a little oblique. Each 

 plate has a strong coupling spine. Of the fiv^e joints of the 

 palp the first is small, the second large, the others successively 

 smaller, the second to the fourth produced into narrow lobes, 

 apically tufted with setse, like the narrow unlobed fifth. 



First gnathopods — Tliese are distinguished from the following 

 six pairs of trunk-limbs by the triangular shape of the fifth joint, 

 and its position overlapped on the outer side by the apical lobe of 

 the fourth, and on the inner side under-riding the sixt;h joint. 

 On the inner margin the fourth and sixlth joints have each five, 

 and the fifth has four spines, which are plumose in such a way as 

 to give a hand-like appearance to the upper shorter ones. The 

 finger is biunguiculate^ with a seta between the outer and the 

 shorter inner unguis. In the other limbs, the fifth joint, though 

 smaller than any of the rest, except the finger, is similar in shape, 

 armature, and mode of articulation to the fourth- 



Fleopods — The inner apex of the peduncle has not more than 

 three or four spines with bent tips. The male appendage of the 

 second pair reaches a li'ttle beyond the margin of the ramus, and 

 is blunt-ended. The sutured plate of the fifth pair is distally 

 squamose, its projecting bosses being especially conspicuous 

 in this respect. This character is perhaps general in the 

 Sphaeromida'. In shape and relative dimensions the rami 

 of the pl^opods seem to show some differences from species 

 to species, but whether the differences are stable and really 

 specific I am not in a position to say. 



Uropods — The peduncle has a strong ridge on the upper 

 side. The fixed inner ramus is oval, setulose on its margins, 

 and has an apical tooth directed a little outward. The 

 movable outer ramus is longer and broader, with irregular 

 outline, the upper surface hollowed, carrying a row of 

 setules, the under surface having two such rows ; the apex is 

 tridentate, the middle tooth large and prominent. 



Length about twice the breadth. The largest specimen, if 

 it would submit to be unrolled, might be i6 mm. long. The 

 smallest differed from the largest and from the one figured, 

 which was 12.5 mm. long, in slightly bent posture, and 7.5 

 mm. broad, by having the telsonic apex simple, not trilobed, 

 and by having much reduced lobes on the basal part of the 

 telson. 



Locality : — Between Bird Island and mainland, Algoa 

 Bay, in a depth between 10 and 16 fathoms, on a bottom of 

 sand, shells, and stones. The extraordinary appearance of 

 the head has suggested the specific name of this remarkable 

 fiarm. 



