57 



1st pair of legs very unlike the others and closely applied to the oral parts, 

 both rami 3-articulate and provided with long plumose setae. The 3 succeeding 

 pairs of legs apparently immobile and without any armature whatever; outer 

 ramus elongate, 3-articulate, inner very small and peculiarly contorted. 5th 

 pair of legs apparently absent. 



Remarks. This is a very anomalous genus, exhibiting some rather ex- 

 traneous characters. Yet in some respects, and more particularly in the 

 peculiar composition of the incubatory pouch, it shows an unmistakable 

 relationship to the genus Bonnierilla Canu, which is a true member of the 

 present family. The genus as yet only comprises a single species, to be 

 described below. 



18. Gunentophorus globularis, Costa. 



(Pi. XXVIII, 2) 



Gunentophorus globularis, Costa, Fauna del regno di Napoli. Entomostraca, PL II. 



Syn : Sphaeronotus Thorelli, Glaus. 



Specific Characters. Female. Body comparatively rather robuste, with 

 the anterior division distinctly curved, the posterior straight. Head not very 

 deep, with the lateral edges scarcely at all curved, and terminating in front in 

 an obtuse corner. 1st trunkal segment short and narrow; the 3 succeeding 

 segments wholly confluent dorsally, to form the greatly prominent, almost 

 hemispherical incubatory pouch; last trunkal segment well defined in its 

 posterior part. Tail considerably exceeding half the length of the anterior division, 

 and cylindric in form, though slightly tapered distally, 1st segment much the 

 largest and a little protuberant below at the base, last segment exhibiting 

 dorsally, somewhat beyond the middle, a slight transverse suture indicating 

 a subdivision of the segment. Caudal rami comparatively small, slightly tapered, 

 and abruptly bent outwards, being armed on the tip with a few very small 

 denticles and on the outer edge, at some distance from the end, with a 

 minute bristle. Eye imperfectly developed, without any lenses, and only re- 

 presented by an irregular patch of a light yellowish red pigment. Anterior 

 antennae very short and stout, subtriangular in outline, and only clothed with 

 a few very small bristles, joints imperfectly defined and apparently 6 or 7 in 

 number. Posterior antennae strongly chitinised and rather powerful, with the 

 terminal joint comparatively short and somewhat tapered distally, apical claw 

 well developed. Mandibular palp with the inner ramus shorter than the outer 

 and less perfectly subdivided. Maxillae with 4 short, but densely plumose setae 



8 Crustacea. 



