336 

 Gen. 78. DanlelSSenla, Boeck, 1873. 



Syn: Jonesiella. Brady, 1880. 



Generic Characters. Body more or less fusiform in shape, with no sharp 

 demarcation between the 2 divisions. Rostrum well defined behind, forming a 

 very thin and hyaline plate. Genital segment in female imperfectly subdivided. 

 Caudal rami, as a rule, rather short. Eye well developed. Anterior antennae 

 very small, with the number of joints much reduced, some of the setae very strong 

 and coarsely spinulose; those in male strongly hinged, sub-cheliform. Posterior 

 antennas with the proximal joint not subdivided; outer ramus well developed, 

 3-articulate. Oral parts on the whole built on the same type as in the other 

 genera of the present family. Natatory legs coarsely spinulose, with the rami 

 comparatively narrow and provided at the tip with coarse spiniform setae; 1st 

 pair differing from the others in the fact that the inner ramus is composed of only 

 2 joints. Inner ramus of 2nd pair of legs in male conspicuously transformed. 

 Last pair of legs with the distal joint well defined, inner expansion of proximal 

 joint in female linguiformly produced. 



Remarks. This genus was established by Boeck as early as the year 

 1873, but was rather imperfectly characterised. The genus Jonesiella of Brady 

 is undoubtedly identical with Boeck's genus, and this name ought of course to be 

 replaced by that proposed by Boeck. Prof. Brady placed this genus within his 

 sub-family Stenheliince : but I think that such an arrangement cannot properly be 

 defended, as its affinity to the 3 other genera included by Brady in that sub-family 

 is in reality a very remote one. On the other hand, the several appendages 

 are built, upon the whole, upon the type characteristic of the present family. 

 In addition to the 2 species described below, a 3rd well-defined species (D. s'ihl- 

 rica) has been characterised and figured by the present author, and a 4th species 

 (D. Brucei) has been recorded by Th. Scott from the coast of Novaja Sembla. 

 The form at first described by Th. Scott as Jonesiella liycence has, on the other 

 hand, recently been raised by that author to the type of a distinct genus 

 Thompsonula. 



215. Danielssenia typiea, Boeck. 



(PI. CCXXIII). 



Danielssenia h/pica, Boeck, Nye slsegter og Arter of Saltvandscopepoder. Ohr. Vid. Selsk. Forli. 



f. 1872, p. 55. 



Syn: Jonesiella spinulosa, Brady. 



Specific Characters. Female. Body comparatively short, slightly depresse 

 in its anterior part, and evenly contracted both in front and behind. Cephalic 



