92 Mr. P. W. Bassett -Smith on 



minute mouth-organs, a slender mandible, straight and sharp- 

 pointed ; outside this is the maxillary palp, with a thickened 

 base, and a cylindrical second joint, ending in two short 

 blunt hairs, the outer being much the shorter. 



First maxilHped placed close behind the rostrum ; it is two- 

 jointed, the first extending to near the border of the head, 

 muscular, the second a slender curved claw, having the con- 

 cave border near the point markedly serrated. 



Second viaxilUped equal in size to that of the first, but 

 having the terminal point simple. 



First pair of thoracic feet minute, placed close under 

 the cephalic border, two-branched, springing from a broad 

 thickened basal plate, the outer branch bearing five short 

 thick hairs, the inner branch more slender, terminating in a 

 single long bristle. The second pair are placed a little pos- 

 terior to the first and of like structure^ the outer branch 

 having, however, only three short hairs. 



Genital segment an elongated oval shape, giving off on 

 either side two pairs of lancinate foliaceous pi'ocesses, equalling 

 in length two tliirds that of the whole animal. 



Abdomen short, rounded, broader than long. Caudal 

 plates simple, lancinate. 



Length 3 millim., excluding processes. 



PSEUDOCLAVELLA, gen. nov. 



Body elongate, without dorsal plates or lateral processes ; 

 head obtusely rounded. Anterior antennas setaceous, indis- 

 tinctly three-jointed. Posterior antennae two-jointed, termi- 

 nating in a powerful simple hook. First maxilliped minute, 

 three-jointed. Second maxilli[)ed two-jointed, long, pro- 

 jecting beyond the cephalic margin. Thorax showing one 

 distinct segment dorsally. Four pairs of limbs are present, 

 the first and second biramose, the third and fourth from the 

 genital segment minute, papilliform ; genital segment four 

 times as long as head and thorax. Abdomen short, caudal 

 plates lamellar. Egg-tubes long, ovules flattened. 



This genus may be known by its single free thoracic 

 segment, by the absence of any lateral plates, by the presence 

 of two pairs of well-formed thoracic limbs, by the oval 

 genital segment, from the sides of which rise tiie third and 

 fourth pair, stump like and rudimentary, by the setaceous 

 indistinctly jointed anterior antenna?, and by the long slender 

 second maxillipeds. It has a near relationship to Glavella, 

 " Oken " ; but in all cases the presence of four pairs of limbs 

 was found (though easily shrivelled up and overlooked in 



