142 



Male exhibiting the usual sexual differences from the female. Anterior 

 antennae of a structure similar to that in the male of W. nobilis, being, however, 

 clearly distinguished by the enormous development of the 2 sensory filaments. 

 First pair of legs, as in the female, with the outer ramus distinctly biarticulate. 

 Inner ramus of 2nd pair of legs differing slightly from that in the male of W. 

 nobilis in the form and armature of the distal joint, the basal spine being quite 

 short, whereas the inner apical spine is rather strong and peculiarly transformed, 

 falciform and finely denticulated along the concave edge. Last pair of legs very 

 like those of the male of W. nobilis, differing, however, in the comparatively larger 

 size of the distal joint, which is moreover provided with 6, instead of 5, setse. 



Colour not yet determined. 



Length of adult female 0.82 mm. 



Remarks. According to the structure of the 1st pair of legs, this form 

 should really have been referred to the genus Pseudotlialestris of Brady; but it 

 is evident that such an arrangement would be quite unreasonable, since in all other 

 respects the present species agrees so closely with the type of the genus West- 

 woodia, that a very close examination is needed in order to distinguish the two 

 species from one another. I think that the present species clearly shows that 

 the genus Pseudothalestris ought to be cancelled. 



Occurrence. I have hitherto only seen 2 females and one male specimen 

 of this form. They were recently found among a number of specimens of W. no- 

 bilis collected at different times and from different places, and I am therefore at 

 present unable to state the locality in which the specimens occurred. 



90. Westwoodia minuta, Glaus. 



(PI. LXXXVIII, fig. 1). 

 Weslwoodia minuta, Glaus, Die freilebenden Copepoden, p. 118, PI. XXI, figs. 10 14. 



Syn: Pseudothalestris monensis, Brady. 

 major, Scott. 



Specific Characters. Female. Body very short and stout, pronouncedly 

 pyriform in shape, with the segments of the anterior division deeply imbricate 

 dorsally. Cephalic segment very large and deep, occupying rather more than 

 half the length of the entire body; rostral projection quite short, triangular. Eye 

 very conspicuous in the living animal. Anterior antenna comparatively slender 

 and attenuated, composed of 6 well-defined articulations, 2 of which belong to the 

 terminal part, 3rd and 4th joints the largest and nearly equal in length. Posterior 



