302 



with 3 strong spiniform sehe. Ovisac oblong in form and rather large, extending 

 beyond tin- caudal raini. number of ova. however, rather limited. 



.!/"/< \\ith the anterior antenna- transformed in exactly the same manner 

 a- in tin- '2 preceding species. Last pair of legs somewhat imperfectly developed, 

 tin.- distal joint not being defined at the base, and being only provided with 2 

 unequal setae; inner expansion nf proximal joint very small, knob-like, with a spine 

 and a Blender seta. 



Colour not yet ascertained. 



Length of adult female 0.52 mm. 



/.'<///<///>. -This form is undoubtedly congeneric with the '2 preceding 

 species, from which it is at once distinguished, however, by the very long and 

 narrow caudal rami. It is also rather inferior in size. 



On <n-,-i-)it'i>. Only 2 specimens of this form, a female and a male, have 

 hitherto come under my notice. They were both found in a sample taken at Kar- 

 sund, south coast of Norway, from a depth of about 20 fathoms, muddy sand. 



Gen. <;:*. RhiZOthriX, Urady & Kobertson. 1875. 



Syn: Enhydrosoma, Brady (not Boeck). 



Generic ('hm-nclcr*. Body sub-cylindrical, smooth, with the segments less 

 >harply marked ott from each other than in the preceding genera. Cephalic seg- 

 ment comparatively large, with the rostral projection obsolete. Caudal rami short 

 ami broad. Anterior antenna, 1 with the number of joints much reduced and clothed 

 \\ith partly ciliated seta-. Posterior antenna- with the outer ramus small, though 

 well defined. Mandibles strongly developed, with the masticatory part very coarse 

 and the p;ilp distinctly Inarticulate. Maxilla- and maxillipeds of normal structure. 

 Natatory legs very small, but with long apical seta-, inner ramus in all of them 

 Inarticulate: 1st pair differing conspicuously from the others, apical seta- of both 

 rami terminating in a tuft of delicate hairs. Last pair of legs with the inner 

 parts of the proximal joints coalesced. Ovisac single. 



Remarks. This ^enus was established in the year 1 .s7."> by Messrs. Brady 

 and Kolx-iNon. lo include a specie-,. /,'. cti i'ni IK , found by them off the British 

 coast. In his Monograph. I'mf. Brady \\ithdrew this genus, believing it to be 

 identical with A'//////'/'''-"""' Bocck. On a closer examination. I have however felt 

 justified in restoring this genus, as the -.penes upon which it was originally founded, 



