Dr. T. Scolt on British Cope.poda. ACA 



additional tonniiial seta on the outer brancli ; !ird, the inner 

 branch of the third pair is proviih^d with an eloni^ateJ slender 

 spine, which sprin^^s from the base of tiie brancli and extends 

 to beyond the apex; -4th, the abdomen is five-jointed; and, 

 5th, the smaller size of the fifth pair of feet. The female 

 carries only one ovisac. 



Though Kvansia has a close resemblance to Tetragoniceps, 

 it is at once distinguished by tlie small uniarticulate inner 

 branches of the second, third, and fourth thoracic feet. 



Type species Evansia incerta, T. Scott. Described under 

 the name of '■^Tetragonicepa incertuft^ T. Scott," in the ' Tenth 

 Annual Report of the Fishery Board for Scotland/ pt. iii. 

 p. 254, pi. xii. figs. 1-17 (1892). 



A second species was described under the name of " Tetrn- 

 goniceps pi/gmcviis^ T. Scott," in the 'Twenty-first Annual 

 lieport of the Fishery Board for Scotland,' pt. iii. pi. iv. 

 figs. 11-19 (1903). This species, as pointed out in the 

 description, agrees with E. incerta in all its more important 

 characters, as, for example, in the structure of the thoracic 

 legs in the female, and only shows some minor differences 

 sufficient for the se})aration of the two species. This species 

 ■will now be known as Evansia pygmcea, T. Scott. 



Genus Leptastacus, T. Scott, nov. 



Description. — Body elongated, slender. Anterior antennae 

 in the female eight-jointed and wanting the hook-like spine 

 observed in the same appendages in Tetragoniceps and 

 Eransia. Posterior antennae three-jointed; outer ramus 

 rudimentary. Mandible and mandible-palp as in Evmsia. 

 First maxillipeds small, provided with two bilobed setiferous 

 proces?:e8 and a moderately stout tern)inal spine. Second 

 maxillipeds slender and armed with an elongated and slender 

 terminal claw. Inner branches of all four pairs of thoracic 

 legs twc-ji»inted and the outer thiee-joinfed. In the fir.st 

 ];au" the inner branches are con.siderably longer than the outer, 

 and the two joints are of nearly equal length. In the next 

 three pairs the inner branclus, which, like those of the first 

 jjair, are composed of two nearly equal joints, are much 

 shorter than the outer. Fifth pair very small and uniarti- 

 culate, they have each a narrow triangular outline and taper 

 gradually to the pointed apex. The abdomen is composed of 

 four segments. One ovisac containing a few tolerably large 

 ova. 



The male does not differ greatly from the female, but the 

 anterior antennic are nine-jojnteil and modified for grasping. 



