158 



ever less attenuated in its outer part. Last pair of legs with the free joint 

 comparatively broader than in L. albens, its posterior edge forming a con- 

 spicuous bulge; apical setae more unequal, the inner one rather short and 

 spiniform. Ovisacs oblong oval in form and somewhat divergent, extending 

 only slightly beyond the end of the tail. 



Colour whitish. 



Length of adult female about 1 mm. 



Remarks. The above-described species agrees pretty well with the 

 description and figures given by Canu of the form regarded by him as L. albens 

 Thorell. That however this identification is erroneous, is at once proved by 

 the figure he gives of the female, 'which is very unlike that given by Thorell, 

 whereas it agrees much better with the species here described. The present 

 form, it is true, is nearly allied to L. albens, but is evidently specifically distinct, 

 as it differs not only in the general form of the body, but also in some of the 

 structural details. It is also rather inferior in size. 



Occurrence. I have only recently become acquainted with this species, 

 2 or 3 female specimens of which were picked out from a number en L. albens 

 collected in different localities and from various Ascidians. It is of course 

 impossible for me to state from which form of Ascidian the said specimens 

 were derived, or at which locality they occurred. Canu states its occurrence 

 in 3 different Ascidians from the French coast, viz., Styela intestinalis, Molgula 

 socialis and Cynthia Inrida. In none of these Ascidians has the true L. albens 

 as yet been found. 



Distribution. - Coast of France (Canu). 



84. Lichomolgus Poucheti, Canu. 



(PI. LXXXVI1I). 

 Lichomolgus Poucheti, Cauu, Copepodes du Boulonnais, p. 231, Pi. XXIII, figs. 5- -12. 



Specific Characters. Female. Body somewhat resembling in shape 

 that in L. Canni, though having the anterior division comparatively broader 

 and regularly oblong oval or elliptical in outline. Cephalic segment large, 

 though not much expanded, and narrowly rounded in front, exhibiting behind 

 dorsally a well-marked transverse suture. Tail comparatively short, only slightly 

 exceeding half the length of the anterior division; genital segment not attaining 

 the length of the 3 succeeding segments combined, and rather tumid in its 

 anterior part, the greatest width equalling the length; anal segment about as 

 long as the 2 preceding segments combined. Caudal rami not much produced, 



