207 



are spiniform, inner expansion of proximal joint rather produced, linguiform, ex- 

 tending far beyond the distal one, marginal setoe 6 in number, all short and 

 spiniform. 



Male with the inner ramus of 3rd pair of legs biarticulate, distal joint 

 projecting inside to a strong deflexed spiniform process and carrying on the tip 

 2 short setae. Last pair of legs- poorly developed, with the inner expansion of 

 proximal joint quite short and carrying 2 spiniform setse. 



Colour whitish grey. 



Length of adult female 0.60 mm. 



Remarks. This form was described by the present author as early as 

 the year 1862 as a species of the genus Canthocamptus, and was subsequently 

 also observed in Germany by Dr. Poppe, who however erroneously identified it 

 with Canthocamptus gracilis G. 0. Sars. The Ophiocamptus Sarsii of Mrazek 

 appears to be the present species, whereas that named by him 0. brevipes is 

 specifically distinct (= M. Mrazeki Scott). The form recorded by Th. Scott as 

 the type of the genus Moraria and named M. Anderson- Smitki, is unquestionably 

 identical with the present species. The most conspicuous distinguishing character 

 of the latter is found in the structure of the last pair of legs. 



Occurrence. I have hitherto only met with very few specimens of this 

 form. They were found many years ago in a small shallow lake in the neigh- 

 bourhood of Christiania. 



Distribution. Sweden (Lilljeborg), Germany (Poppe), Scotland (Scott). 



Gen. 45. MeSOChra, Boeck, 1865. 



Syn: Paratuchidius, Brady & Kobertson. 



Generic Characters. Body, as a rule, not much elongated, tapering be- 

 hind. Cephalic segment comparatively large and produced in front to a more or 

 less prominent flattened rostral projection. Anal opercle not spinulose. Caudal 

 rami short, transversely truncated at the tip. Anterior antennae comparatively 

 short, with the number of articulations reduced, those in male hinged irAhe usual 

 manner. Posterior antennae with the basal part not subdivided, outer ramus very 

 small and narrow, uniarticulate. Mandibular palp, as a rule, biarticulate, with 

 the basal joint not expanded. Maxillse and maxillipeds about as in the preceding 

 genera. 1st pair of legs distinctly prehensile, with the inner ramus mucb longer 



