300 



lowish brown colour. The swimming movements of the animal are rather clumsy, 

 and are effected in an abrupt jerking manner. When disturbed, it immediately 

 sinks to the bottom, and rolls its body up almost into a ball by a strong ventral 

 flexure, remaining in this attitude for some time. Exactly the same behaviour 

 may also be observed, in the succeeding species. 



Occurrence. I have met with this form not unfrequently in the upper 

 part of the Christiania Fjord in a depth of about 6 fathoms, muddy bottom. It 

 also occurs occasionally at Skutesnses, south-west coast of Norway, and is more- 

 over recorded by Th. Scott from the Finmark coast. 



Distribution. Scottish coast (Scott). 



198. Enhydrosoma propinqvum (Brady). 



(PI. CCVI). 

 Cletodes propinqva, Brady, Monogr. Brit. Copepoda, Vol. Ill, p. 94, PI. LXXVII, figs. 917. 



Specific Characters. Female. Body considerably more slender than in 

 the type species and tapering more gradually behind. Cephalic segment less 

 tumid, with the rostral projection broader and terminating in a blunt, somewhat 

 recurved point. Urosome much shorter than the anterior division, last segment 

 larger than the preceding one and scarcely widening distally. Caudal rami com- 

 paratively small, blade-like, with the lateral setae rather distant, dorsal seta issuing 

 close to the base, middle apical seta scarcely longer than the ramus itself. An- 

 terior antenna short and stout, with the 2nd joint much larger than the 3rd, 

 terminal part scarcely half as long as the proximal one. Posterior antennae with 

 the terminal joint fully as long as the basal one, and less dilated distally than 

 in the type species; outer ramus somewhat larger than in that species, but of a 

 very similar structure. Mandibular palp comparatively smaller, with only a single 

 lateral lobule. Natatory legs resembling in structure those in E. curticaudatum, 

 though having the rami somewhat less robust. Last pair of legs likewise built 

 upon the same type, distal joint however wanting the dense clothing of hairs on 

 the outer edge, which is only finely ciliated in its proximal half, marginal setae 

 4 in number, one very strong at the tip, and 3 much shorter ones on the outer 

 edge; inner expansion of proximal joint not extending to the middle of the distal 

 joint, and carrying on the tip a strong lancet-shaped spine, inside 2 more 

 slender setse. 



Male with the caudal rami somewhat narrower than in female. Anterior 

 antennae hinged in the same manner as in the preceding species. None of the 



