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III. GENERA AND SPECIES. 



Bentheuphausia G. O. S. 



Only one species, B. amblyops G. O. S., is known. 

 Sars' account (16) of this bathypelagic and widely distri- 

 buted form is excellent. 



Thysanopoda H. M.-Edw. 

 (Parathysanopoda Illig). 



Parathysanopoda foliifera Illig was established 1909 

 (12) on a single Atlantic specimen measuring i5 mm. in 

 length. The only generic difference from Thysanopoda is 

 that the cornea of the eyes is divided into a smaller frontal 

 and a larger lateral part. But in the « Siboga » report I 

 showed that the same is the case in very young specimens 

 of Thysanopoda orientalis H. J. H., and I am able to prove 

 that in very young specimens of T. pectinata Ortm. the 

 eyes show the same feature. The genus Parathysanopoda 

 is in reality to be cancelled as based on a juvenile charac- 

 ter. And Illig's description and fig. 2 of his P. foliifera, 

 especially the lobe from first antennular joint, agree so 

 well with quite young specimens of T. pectinata Ortm. 

 examined by myself, that I am quite sure that his speci- 

 men belongs to this species. 



Quite recently I have arrived at the result that T. Agas- 

 si{ii Ortm . cannot be maintained as a species different from 

 T. monacantha Ortm. (comp, the remarks in the « Siboga » 

 report) . And in September 1 908 Illig cancelled T. megalops 

 established by himself (10) a few months before on two 

 mutilated specimens ; unfortunately he does not give the 

 name of the species to which his form ought to be referred, 



