145 



appearance, the basal part being very slender, almost cylindric in form, inner 1 

 ramus abruptly reflexed, outer quite rudimentary and occurring at rather a long 

 distance from the inner. Maxillae with the palp much produced, vibratory plate 

 rudimentary. Anterior maxillipeds with strong, claw-like spines on the distal part, 

 proximal lobes very small. Posterior maxillipeds with the 1st basal joint con- 

 siderably produced in front, and carrying strongly developed setse, distal part 

 very small, with the setse rudimentary. Inner ramus of 1st pair of legs 3-articu- 

 late, that of the 3 succeeding pairs biarticulate. Last pair of legs in female with 

 both rami uniarticulate, outer slender and linear, inner short, conical; those in 

 male 3-articulate, terminal joint in both legs spatulate. though of somewhat diffe- 

 rent form. 



Remarks. This genus was -established in the year 1878 by Prof. Brady, 

 to include a form previously described by Lubbock as a species of the genus 

 PonteUina of Dana. The removal of this form, not only from that genus, but 

 also from the family Pontellidce, is justified by a number of well marked differences, 

 which have been mentioned in the preceding pages. The genus comprises at 

 present only a single species, to be described below. 



61. Parapontella brevicornis (Lubbock). 



(PI. XCVII & XCVJII). 

 PonteUina brevicornis, Lubbock, in Ann. Nat. Hist., 2nd series, Vol. XX, p. 407, PI. XI, figs. 4 8. 



Specific Characters. Female. Anterior division of body, seen dorsally, 

 oval in form, greatest width slightly exceeding half the length, and occurring in 

 the middle, anterior extremity somewhat contracted and narrowly rounded at the 

 tip, posterior but slightly attenuated. Cephalosome about the length of the 3 

 succeeding segments combined, and evenly vaulted above. Lateral lobes of last 

 segment of metasome somewhat deflexed and narrowly rounded at the tip. Uro- 

 some scarcely attaining half the length of the anterior division, genital segment 

 slightly tumefied in its proximal part and rather protuberant below, 2nd segment 

 armed at the posterior edge with 2 sub-dorsal, posteriorly-pointing spines. Caudal 

 rami about 3 times as long as they are broad, sublinear in form, and scarcely 

 divergent, marginal setaj of moderate length, the outermost issuing from the 

 outer edge, at some distance from the others. Anterior antenna much shorter 

 than the anterior division of the body, reaching, when reflexed, to about the end 

 of the 2nd pedigerous segment, proximal part somewhat tumefied and clothed 

 inside with a number of partly plumose seta;, apical bristles likewise ciliated. 



20 Crustacea. 



