_L23_ 



divided, outer ramus small, biarticulate. Oral parts on "the whole less fully de- 

 veloped than in the preceding genera. 1st pair of legs with the rami very nar- 

 row and rather unequal, the inner one being much the longer and only composed 

 of 2 joints, the distal one very small; outer ramus with 3 well-developed claws 

 at the tip. Natatory legs slender, with the outer ramus much longer than the 

 inner, setae of the inner edge in both rami poorly developed; inner ramus of 3rd 

 pair of legs in male slightly transformed. Last pair of legs with the distal joint 

 much more prominent than the proximal one. 



Remarks. This new genus is founded upon the form recorded by Glaus 

 as Thalestris forficula, a species which has proved to differ very markedly in several 

 respects from the other Thalestridse, not being referable to any of the genera 

 treated of in the preceding pages. We do not know at present with certainty 

 more than a single species, to be described below. 



78. Microthalestris forficula (Glaus). 



(PI. LXXVI). 

 Thalestris forficula, Clans, Die freilebenden Copepoden, p. 131, PI. XVII, figs. 711. 



Syn: TJialestris karmensis, Boeck. 

 forficuloides, Scott. 



Sj)ecific Characters. Female. Body narrow and elongated, seen dorsally, 

 almost linear in form, with rather thin and flexible integuments. Cephalic seg- 

 ment scarcely longer than the 3 succeeding ones combined, epimeral parts not 

 very deep, but evenly curved; rostrum very narrow, lanceolate. Epimeral plates 

 of the 3 succeeding segment small and rounded behind. Last segment of meta- 

 some scarcely narrower than the preceding ones. Urosome considerably exceeding 

 in length half the anterior division, and cylindric in form, with the segments densely 

 spinulose at the hind edge both ventrally and laterally, genital segment about 

 the length of the 2 succeeding ones combined, and distinctly divided in the mid- 

 dle. Caudal rami very, short, with the innermost but one of the apical setse 

 greatly developed, abruptly bent at the base, and about twice as long as the 

 urosome. Anterior antennae of moderate length and densely clothed with rather 

 long setae, distal part considerably exceeding half the length of the proximal one. 

 Posterior antennae with the distal joint but slightly dilated, apical setae compara- 

 tively strong, spiniforrn, outer ramus small, with the 2 joints subequal in length. 

 Mandibular palp with the basal part only slightly expanded, outer ramus very 

 small. Posterior maxillipeds not very strong, hand oval in form, with the palmar 



