144 



as the remainder of the body, and dorsally mo-lapping the greater part of 

 the succeeding segment: rostral projection rather short. Anterior antenme com- 

 paratively shorter than in IT. iitiinitn. though composed of 7 well-detined arti- 

 culations, 3 of which belong to the terminal part. Posterior antenna? and oral 

 parts scarcely different from those in the said species. 1st pair of legs likewise 

 of a very similar structure, only differing in having the seta of the 1st joint of the 

 inner ramus attached about in the middle. Last pair of legs, on the other hand, 

 of a rather different appearance, the inner expansion of the proximal joint being 

 \ery slight, whereas the distal joint is considerably exserted at the tip. 



Mull- differing from that of IT mhtufa chiefly in the structure of the 

 inner ramus of the 2nd pair of legs, the distal joint of which is rather broad 

 and angular in form, projecting both at the outer edge and at the tip in a denti- 

 form projection, inner apical spine very strong and curved, outer feeble. >etiform. 



Colour yellowish with light brown shading. 



Length of adult female 0.35 mm. 



//(///////.-. This form bears a general resemblance to II'. inin/iln. but is 

 of much smaller size and shorter form of body. It also differs conspicuously in 

 the structure of the anterior antennae and the last pair of legs. 



( )cni m')u-L'. I have met with this dwarf form not (infrequently in several 

 localities both on the south and west coasts of Norway, in moderate depths 

 among algre. It moves in a peculiar, tremulous manner, much as do the species 

 of the genus Tegnstf*. 



. Scottish coast (Scott). 



Fam. 11. Diosaccidse. 



r*. Body of somewhat varying form in the different genera, but 

 never depn^ed as in some of the Thuh'slrnlii-: body-segments, as a mle. not very 

 sharply marked oil from each other. KoMrum well defined at the base, more 

 or les> mobile. Anterior antenna' short or of moderate length, generally s-articn- 

 late. in male distinctly prehensile. Posterior antenna 1 with the basal joint not 

 dhided, outer ramus comparath eh Miiall. Oral parts of someu hat different struc- 

 ture in the dilierent 'jenera. M pair of le.^s with the rami, as a rule, very un- 

 equal, the outer one bein.u geiieralh much shorter than the inner, and less di>- 

 tinctly prehensile than in the '/'//'//<.>// /,/// . Natatory hr- im.iv or less slender, 



