191 



exhibiting inside in the middle a deep excavation and carrying on the tip a single 

 slender spine, inner edge below the excavation provided with a similar spine, and 

 in front of it with a simple seta. Inner ramus of 3rd pair of legs also somewhat 

 transformed, though consisting of 3 well-defined joints, the last of which, however, 

 is considerably larger than in female, and provided with an additional seta inside. 

 Last pair of legs with the distal joint well defined, but very small, not dilated 

 towards the end and only provided with 4 small setse; inner expansion of prox- 

 imal joint very slight and carrying 2 subequal setse. 



Colour more or less distinctly reddish. 



Length of adult female 0.48 mm. 



Remarks. This form has been very imperfectly characterised by Boeck, 

 and was therefore not recognised by Mr. Scott, who described it as a new species 

 under the nama of Delavalia minutissima. Some of the figures given by Prof. 

 Brady of his species Delavalia reflexa (for instance figs. 9 and 14) undoubtedly 

 refer to the present form. The most prominent feature of this species is unques- 

 tionably the very narrow and elongated caudal rami, a character which indeed has 

 given rise to the specific name longicaudata proposed by Boeck. In the structure 

 of the 1st pair of legs it somewhat resembles Delavalia robusta of Brady, a spe- 

 cies which also may be referred to the Norwegian fauna, as it is recorded by 

 Th. Scott from Finmark. 



Occurrence. I have met with this form occasionally in the upper part of 

 the Christiania Fjord, as also at Flekkero, south coast of Norway, in moderate 

 depths among algae. 



Distribution. British Isles (Brady, Scott). 



Gen. 41. StenheliOpSiS, G. O. Sars, n. 



Generic Characters. General form of the body somewhat resembling that 

 in Stenhelia, being rather short and stout. Kostrum immobile, forming a thin 

 linguiform plate, without any ventral carina. Urosome much narrower than the 

 anterior division. Caudal rami long and narrow, divergent. Anterior antennae 

 short and much curved, with the number of articulations reduced. Posterior an- 

 tennae rather strongly built, but with the apical setae comparatively small, outer 

 ramus of moderate size, biarticulate. Mandibles with the palp of quite normal 

 appearance. Maxillae and anterior maxillipeds likewise of usual structure. Poste- 



