BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 10. X:0 14. 9 



generic description ^) in somewliat different terms, giving at 

 the same time a diagnosis of" the species, Daira Gabertii, from 

 the Indian Seas. In the literature we do not meet again with 

 the name Daira, M.-E., be före 1853, in the great work of 

 Dana -). But I am quite sure that Dana was wrong in in- 

 troducing the aniraals described by him into the genus Daira 

 of Milne-Edwards, and a comparison between the descriptions 

 of Milne-Edwards and of Dana will easily show how little 

 the Daira of the latter has to do with that of the former. 

 At the same time I will give a parallel description of Para- 

 phronima, Claus, which genus comes in mj opinion nearest 

 to, if it not is identical with, the Daira of Milne-Edwards. 

 In any case the name Daira must be rejected, as it was al- 

 ready used at an earlier period for a genus of crabs. It was 

 in fact rejected by Dana, who substituted Dairinia, but as 

 Dana's types belong to a widely different family of Hyperids 

 (Lyc3eid3e,CLAUS)^),this name cannot be adopted instead of Daira. 

 If Paraphronima cannot be considered identical with it, which 

 is a little doubtful, a new name must be proposed for the 

 type of Daira Gabertii. After the parallel descriptions of the 

 genera I give short diagnoses of some new species of Para- 

 phronima and for the sake of comparison' also of the two 

 species of Claus. 



Daira. H. Milne- 

 Edwaeds. 



Head large tumid. 



The antennse very 

 short, subulate, inserted 

 as in Hyperia. 



The thorax not tnmid, 

 but decreasing back- 

 wards, the seventh seg- 

 ment being much the 

 narrowest. 



Dairinia. Danä. 



Head oblong subtri- 

 angular small. 



The antenn» inserted 

 in lower sideof thehead, 

 short, five- to seven- 

 jointed. 



The thorax highest at 

 middle,notvery decreas- 

 ing backwards, the se- 

 venth segment being 

 nearly as high as the 

 preceding. 



Para-pTironima. Claus. 

 Head large tumid. 



The uj^per antennje 

 short, the flagellum 

 swollen, tapering to- 

 wards the end, inserted 

 on the anterior side of 

 the head, as in Hyperia. 



The pereion nottumid, 

 but decreasing back- 

 wards, the seventh seg- 

 ment being much the 

 narrowest. 



') iHist. nat. des Crustacés». Torne 3. Paris 1840. Pag. 83. 



^) »United States Exploring Exped. Crustacea». Part. 2. Philadelphia 



1853. Pag. 981, 991 and 1442. 

 ^) Dairinia, Dana, is, in my opinion, synonymous to Tliaymjris, Spence 



Bate. 



