KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 249 



He mentioned two species as belonging to thc iiew genus, Parathemuto c.om- 

 jyressn, A. GoÉS, and P. ahyssorum, n. sp. Of the characteristics used in the diagnosis 

 those relating to the mouth-organs, and to the first two pairs of perasopoda agree -with 

 Euthemisto, and the characteristic »dorso carinato» has only specific value. 



In 1872 he repeated the Latin diagnosis, adding the following remarks, whic^h I 

 translate : 



»This genus forms a transition between Hyperia and Themisto, but comes nearer to the 

 latter, from which, however, it essentially differs by the last three pairs of legs being of the same 

 shape and size, while in 1'liemi.sto the fifth pair are dissimilar to the others and much elongated. 

 To this genus may also belong the Hyperia ohlivia, described by Spence Bate and Westwoo]) 

 (Brit. Sessile-eyed Crust. II, p. 16), though they describe and figure the first (two) pairs of legs 

 as if they were of the same sliape and not jjrovided with a scissors-like hand in the second pair, 

 and do not mention that the dorsal side is carinated or angulated; it resembles however the follow- 

 ing species in all the other points. H. trigona, Dana, too, belongs probably to this genus, the 

 species of which thus seem to be distributed över a large area of sea.» 



In 1882 G. O. Sars mentions the genus in his list of Norwegian Crustacea, attribut- 

 ing to it the same two species as did Boeck. 



In 1887^) I placed the genus between Hyperiella and Eutliemisto, enuinerating the 

 following species, Parathemisto ahyssormn, Boeck, P. oblivia, Kroeyer, P. comjyressa, 

 A. GoÉS, P. longipes, n. n. (— P. gracilipes, Norman), P. trigona. Dana, and P. ja- 

 ponica, n. sp.; and giving brief descriptions of all but P. longipes. 



In 1888 Th. Stebbing mentioned the species belonging to the genus, and described 

 a new species, Parathemisto pacifica. 



The fii"st species belonging to Parathemisto recorded in the literature was thus 

 Hyperia ohlivia, described in 1838^) by H. Kroeyer. The next addition was made by 

 J. D. Dana, who in 1852^) described Lestrigonus rubescens and Hyperia trigona; as to 

 the former species I am a little doubtful whether it really belongs to Parathemisto or 

 not; with respect to the latter I am fully convinced that it is a true Parathemisto. 

 In 1862 Spence Bate*) described under the name Hyperia trigona (Dana) a Parathe- 

 misto which is specitically distinct from Parathemisto trigona. Dana, and which is 

 recorded here as Parathemisto Batei, n. n. In 1868 Spence Bate and Westwood^) 

 described and tigured under the name of Hyperia ohlivia, (Kroeyer), a Parathemisto, 

 which A. Merle Norman,'^) in 1869, recognizing its non-identity with Kroeyer's species, 

 renamed Hyperia gracilipes. In 1870 A. Boeck instituted the new species Parathemisto 

 ahyssorum, which Avas the type for the geiuis Parathemisto, but which, in my opinion. 



') In »Systematioal list» and »Arctic and Antarotic Hyperids». 



^) H. Kroeyer, oGr0nlands Amfipoder», p. 70. 



ä) J. D. Dana, "United States Exploring Expedition. Crustacea.» Vol. 2, p. 984 and 987. 



*) Spence Bate. Catalogue of the specimens of Amphipodous Crustacea in the collection of the Bri- 

 tish Museum, p. 297, pl. 49, tig. 4. 



^) Spence Bate and Westwoou, A History of the British Sessile-eyed Crustacea. Vol. 2, p. 16. 



") A. Merle Norman, »Shetland Knal Dredging- Keport». Part. 2. On the Crustacea» etc. Eeport of 

 the SS'*' Meeting of the British Association for the Advancenient of Science; held at Norwich, 1868, p. 287. 



K. Sv. Vet. Akad. Handl. Band. 22. N:o 7. ""^ 



