104 



in its anterior part, which projects on each side to a hamiform, posteriorly- 

 pointing process; anal segment much smaller than the preceding one. Caudal 

 rami exceedingly long and slender, linear, attaining about the length of the 

 remaining part of the tail, and only very slightly divergent; outer edge very 

 finely ciliated, inner smooth, tip transversely truncated; apical setae comparatively 

 short, the innermost hut one scarcely longer than the corresponding ramus. 

 Anterior antennae not quite as long as the cephalic segment, and composed of 

 2t well-defined joints, terminal part distinctly 3-articulate. Posterior antennae 

 with the penultimate joint scarcely half as long as the preceding one; rudimentary 

 outer ramus attached close to the end of the latter joint. Oral cone very short, 

 almost globular in form, its extremity being obtusely blunted and only extending 

 to the insertions of the anterior maxillipeds. Mandibles and maxillae pointing 

 almost straight inwards. Anterior maxillipeds with the claw rather slender and 

 evenly curved in its outer part, basal spine rather strong and likewise curved. 

 Posterior maxillipeds comparatively slender. Natatory legs with the number of 

 setae about as in Ascomyzon : spines distinguished by their broad dagger-like form 

 and the coarse denticulation of their edges. Last pair of legs with the proximal 

 joint well defined and of the usual appearance, distal joint rounded triangular 

 in form and provided with 2 small apical bristles and 2 lateral ones, that 

 of the outer edge the longer. Ovisacs, in the specimen examined, very small,' 

 each containing only 3 ova, arranged in a single row. 



Body of a clear whitish colour, partly tinged with reddish orange; ovarial 

 tubes dark green. 



Length of adult female about I mm. 



Male unknown. 



Remarks. This form was first anounced under the above name by 

 Norman & Scott in the year 1905 from a single female specimen taken 

 in Plymouth Sound. In the following year this specimen was redescribed 

 and figured in detail by the same authors in their work on the Crustacea of 

 Devon and Cornwall. 



Occurrence. Only a few female specimens of this form have hitherto 

 come under my notice. They were taken, many years ago, in the upper 

 part of the Christiania Fjord from a depth of about 30 fathoms among dredged 

 material. 



Distribution. British Isles (Norman & Scott). 



