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



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

 border. 



Posterior anteiwce small, acutely bent. First maxilliped 

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

 is slightly granular on iiigh magnification. 



First peroiO'pod with three long end-bristles and three 

 moderately long plumose setge on the posterior border. 



Fourth 'perao'pod\\z:^m^ 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 plates longer than 

 broad, curved inwards, with three long terminal set£e and a 

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



Length 6 millim. 



I'his subgenus seems to be found most regularly on the 

 '' Scia^nidas," 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 antennae setaceous, six- or seven-jointed. Posterior 

 anteimaB 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 uniramose, third 

 stump-like. 



Oenital segment about three times the length of head and 

 thorax. Caudal plates of moderate size, lancinate. 



Male. — Smaller, but differing slightly from female. 



This genus should be placed between Clavella of Oken and 

 Pseudocycnus of Heller, being most nearly related to the 

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

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

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

 maxillipeds. 



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

 A number of specimens of this species were found in the 



gills of a Cyhium guttatum at Bombay, both sexes, colour 



dull opaque white. 



Length about 8 millim. 



Female (PI. V. fig. 1). — Head almost round. Anterior 



