431 



from those in the type species. Last pair of legs however rather different, 

 forming simple transverse lamellae contiguous in the middle, each lamella exhi- 

 biting a slight median incision and carrying on either side of the incision a 

 row of 5 closely-set plumotis setae, outer corner exserted to a knob-like promi- 

 nence tipped with a delicate bristle. Ovisac oval in form and attached to the 

 genital segment by a long stalk. 



Male still more slender than female, and scarcely smaller. Anterior 

 antenna? 5-articulate and strongly hinged, with the 4th joint globularly dilated 

 and the terminal joint claw-shaped. Last pair of legs smaller than in female 

 with the median incision obsolete and the number of setae much reduced. 



Colour not yet ascertained. 



Length of adult female 0.68 mm. 



Remarks. The above-described form is unquestionably referable to the 

 genus Ehizothrix, as characterised in the main part of this work, agreeing, as it 

 does, in all essential structural details with the type species, R. curvata Brady, 

 though being specifically well defined. 



Occurrence. Several specimens of this form were picked up from samples 

 taken last summer at Korshavn from a depth of about 20 fathoms, sandy bottom. 



Distribution. Scottish coast (Scott). 



Page 320. 

 Add the following new genus : 



Gen. AnOplOSOma, G. 0. Sars, n. 



Generic Characters. Body without any armature whatever, the segments 

 being evenly rounded both laterally and dorsally. Rostrum wholly absent. 

 Caudal rami moderately slender, linear in form. Anterior antennae narrow and 

 elongated, with the terminal part distinctly biarticulate ; those in male slightly 

 hinged. Posterior antennae very slender, outer ramus rudimentary. Mandibular 

 palp slender, biarticulate. Maxillae very small. Anterior maxillipeds with only 

 a single setiferous lobe inside the basal joint. Posterior maxillipeds normal. 

 1st pair of legs very small and imperfectly developed, both rami being composed 

 of only a single joint. The 3 succeeding pairs of legs extremely slender and 

 projecting laterally; 2nd basal joint much prolonged and forming with the 1st 

 an elbow-shaped bend, outer ramus very narrow and elongated, with the full 

 number of natatory setae; inner ramus exceedingly small, uniarticulate. Last 

 pair of legs with the distal joint long and slender, proximal joint only slightly 

 expanded inside, but having outside a very long and narrow process. 



