as the remainder of the body, and dorsally overlapping the greater part of 

 the succeeding segment; rostral projection rather short. Anterior antennse com- 

 paratively shorter than in W. minuta, though composed of 7 well-defined arti- 

 culations, 3 of which belong to the terminal part. Posterior antennse 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 

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



Male differing from that of Th ninuta 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, setiform. 



Colour yellowish with light brown shading. 



Length of adult female 0.35 mm. 



Remarks. This form bears a general resemblance to W. minuta, but is 

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

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



Occurrence. I have met with this dwarf form not unfrequently in several 

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

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

 of the genus Tegastes. 



Distribution. Scottish coast (Scott). 



Fam. 1 1 . Diosaccidae. 



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

 never depressed as in some of the Thalestridce ; body-segments, as a rule, not very 

 sharply marked off from each other. Rostrum well defined at the base, more 

 or less mobile. Anterior antennse short or of moderate length, generally 8-articu- 

 late, in male distinctly prehensile. Posterior antennae with the basal joint not 

 divided, outer ramus comparatively small. Oral parts of somewhat different struc- 

 ture in the different genera. 1st pair of legs with the rami, as a rule, very un- 

 equal, the outer one being generally much shorter than the inner, and less dis- 

 tinctly prehensile than in the Thalestridce. Natatory legs more or less slender, 



