4 G. 0. Sårs. 



regards this part of the fauna. In one or two subsequent 

 papers, I intend to give a full account of all the South 

 American species raised by me here in Christiania or found 

 in the samples received. Severals of these have turned out 

 to be identical with species formerly described from other 

 parts of the world, and rather interesting facts have there- 

 by been proved as regards the geographical distribution of 

 the species. There are also a number of forms of all three 

 orders, which are new to science, and which will be more 

 closely described and figured in the same papers. 



The 2 plates accompanying this paper have been pre- 

 pared with the outmost care by the autographic process, 

 the habitus-figures being copies from coloured drawings made 

 from living specimens raised. in my aquaria. 



Gen. Jheringula, G. O. Sars, n. 



Generic Characters. — General form of body rather 

 short and clumsy, resembling somewhat that in Macrothrix, but 

 differinginthe circumstance thatthe cephalic shield is defineddor- 

 sally from the carapace by a deep depression. Eostral prominence 

 comparatively short. Fornix distinct. Valves comparatively 

 small, not covering the hindmost part of the trunk, and not 

 admitting of being closed below; free edges, as in Macro- 

 thrix, clothed with a double row of setæ, partly assuming 

 a spiniform character. Ocellus small, but distinct, Anten- 

 nulæ slender, cylindric, more or less recurved, spinous in- 

 side, apical papillæ comparatively short; those of male 

 greatly elongated, with a slender sensory bristle at some 



