96 PERCY SLADEN TRUST EXPEDITION 



apex forms a little tooth, which, however, may not be invariably present, as it is not 

 shown in Hansen's figure of this appendage ; the hairy inner margin is slightly concave. 



The mouth-organs are almost exactly as figured by Hansen for E. elegantula. The 

 horn of the clypeus is narrow, a little emarginate at the tip. The colour dorsally is 

 brown, with stellate markings on the perseon, only the telsonic segment being colourless 

 except at its base. 



The length of the specimen measured was 4*5 mm. 



Locality. S. of Saya de Malha Bank, in surface net (m). 



9. Enrydice humilis, n. sp. (Plate 8 a.) 



This species, founded on a single specimen, an adult male, is distinguished by its 

 small size, its poorly furnished limbs, the shape of the telsonic segment, and the form of 

 the male appendix in the second pleopods. The species to which it makes the nearest 

 approach are E. achata (Slabber), E. i?iermis, Hansen, and E. convexa, Richardson. The 

 first two, like most species of this genus, have the telsonic segment more or less truncate, 

 in the third it is denticulately rounded at the apex, but on each side there is a tooth 

 separated by an interval from the apical dentation. In the present species there are five 

 apical teeth on the narrowly rounded apex, preceded on each side by a short space of 

 faintly perceptible serration. 



The eyes are large and dark. The first antenna? reach about to the end of the 

 third joint of the second pair, in which the fourth joint is not twice as long as the 

 third, supporting a flagellum of twenty-one joints with a long apical seta. 



The upper lip is furnished with six little dark spinules fringing the emargination 

 of its distal border. 



The mandibles have the cutting-edge divided into three teeth on one member and 

 four on the other, there are six spines in the spine-row, and about fourteen teeth on 

 the blade which represents the molar. The second joint of the palp is much the longest, 

 and carries a single seta ; the third joint is tipped with five setae. The other mouth- 

 organs, so far as could be seen, did not depart from the usual type. 



As will be seen from the figures the gnathopods and perreopods are content with 

 few spines and setae. The first and second gnathopods and first peroaopods are nearly 

 alike in size and structure. The last four peraeopods agree in structure, but the second 

 pair is much the smallest, and the fourth notably larger than the third or fifth. The male 

 appendages on the ventral part of the seventh perason segment are short and cylindrical. 



The second pleopods have three spines on the inner margin of the peduncle. The 

 male appendix or second joint of the inner ramus is attached a little above the middle 

 of the first joint, descending considerably below it as a straight narrow rod, with a little 

 point turned outward at the apex, without any deep incision such as is noted for 

 E. achata (commonly called E. 'pulchrci). The uropods have the outer branch much 

 shorter than the inner, and do not nearly reach the apex of the telsonic segment. 



Length 3 mm., apparently smaller than any other record for an adult male in 

 this genus. 



