10 Mr. P. W. Bassett-Smitli on some 



long and several short liairs, also one or two on the posterior 

 border. 



Posterior antennce small, acutely beut. First maxilliped 

 very slender, second with very strong simple end-claw, which 

 is slightly granular on high magnification. 



First pera'opod with three long end-bristles and tliree 

 moderately long plumose seta2 on the posterior border. 



Fourth perao'podhvivm^ four long, slightly curved, terminal 

 claws close together and a fifth halfway down the inferior 

 border. 



Genital segment rather longer than broad, much larger 

 than cephalothorax. Abdomen long, thick, single-jointed, 

 constricted at the anterior end. Caudal phites longer than 

 broad, curved inwards, with three long terminal setfe and a 

 shorter one on the outer side (PI. IV. fig. 3). 



Length 6 millim. 



This subgenus seems to be found most regularly on the 

 " ScifenidEe," the comparative small size of the cephalo- 

 thorax, small lunula?, and extremely large maxillipeds being 

 very distinctive. 



Family Dichelesthina. 



Genus Helleria, nov. 



Body elongate, •without dorsal plates ; head rounded. 

 Anterior antennte setaceous, six- or seven-jointed. Posterior 

 antenna} in shape of strong hooks. First maxillipeds small, 

 second in form of large claws. Thorax three-jointed, each 

 provided with a soft lateral process. Three pair of rudimentary 

 limbs only present — first biramose, second uniramosc, third 

 stump-like. 



Genital segment about three times the length of head and 

 thorax. Caudal plates of moderate size, lancinate. 



^Jale. — Smaller, but differing slightly from female. 



This genus should be placed between Clavella of Oken and 

 Pseudocgcnus of Heller, being most nearly related to the 

 latter, but having these generic differences: — (1) many-jointed 

 anterior antenna*; (2) three-jointed thorax, bearing only 

 three pair of limbs ; and (3) enormously enlarged second 

 maxillij)eds. 



Helleria armata^ sp. n. (PI. V. figs. 1, 2.) 

 A number of specimens of this species were found in the 



ills of a Cyhium gnttatum at Bombay, both sexes, colour 



ull opaque white. 

 Length about 8 millim. 

 Female (PI. Y. fig. 1). — Ilead almost lound. Anterior 



