THE COPENHAGEN MUSEUM AND OTHER SOUECES. J.23 



Paramicrukopus, n. g. 



One of the pleon-segments abruptly elevated above the next. Fifth and sixth pleon- 

 segments very small. Antennae short, the first the longer, with small accessory 

 flagelluni. Third uropods rudimentary, the rami not very unequal. Telson small. 



The species are Panimicrurojnis Sohkii (Dybowsky). 1874, and Paramicrtiropus 

 Toczaiioioskii (Dybowsky), 187i, lioth from Lake Baikal. 



Gen. Gammaeellus Herbst, 1793. 



Under the designation Cancer {Gainmarellus) Herbst has grouped a large number of 

 species, and for some part of the group it seems right that Gammarelliis should be used 

 as the generic name. The majority of the species are Amphipoda, so that it seems 

 further not unreasonable to select an amphipod as type of the genus. The first species 

 in Herbst's list that is an amphipod is the one which he calls Cancer {Gammarellus) 

 homari. This is a species instituted by Pabricius in 1779. It was called Amatlda 

 Sabinil by Bate in 18G2 ; but the name Amathia, due to Rathke in 1837, having been 

 preoccupied by Lamarck in 1812, Bate and Westwood altered the generic term to 

 Atnathillu. Spence Bate, however, had previously called the young form of the above- 

 mentioned species Gi'aijia hnbricata, so that Gnnj'ia has precedence of Amathilla. 

 :Since a change, then, in any case is necessary, the opportunity is favourable for restoring 

 Herbst's Gammarellus, and there is an additional advantage in that we are thus enabled 

 to dispense both Avitli Grayia, which is inconveniently similar to the name of a reptilian 

 genus, Grrtirt Giinthcr, 1858, and ^'\\\\ Amathilla, which is equally near to the molluscan 

 name Amathella Gray, 1859. 



The two species coming under this revived generic name are Gammarellus homari 

 (Fabricius), 1779, and Gammarellus angulosus (Eathke), 1843. A third nominal species, 

 Gammarellus carinatus (Bathke), is not certainly distinct from G. homari. 



EUCRANGONTX, n. g. 



Like Craugonyx in general, but with a small inner ramus to the third uropods. Telson 

 emarginate. 



The species assigned to this genus are: — 1. Eucrangonyx mucronatus (Forbes), 1876; 

 2. En. Vejdovskyi, a new name for Crango)iyx suhterranem Vejdovsky, 1896, which 

 seems to me distinct from the sjiecies so named by Bate in 1859 ; 3. Eu. Packardii 

 (Smith), 1888 ; 4. Eu. gracilis (Smith), 1871 ; 5. En. antennahis (Packard), 1881. 

 Eu. gracilis is from Lake Superior and Lake Huron, the others from wells or svib- 

 terranean streams. 



Gen. AxELBOECKiA, n. n. 



The name is proposed as a substitute for Btoeckia Sars, 1894, preoccupied by Malm in 

 1870, and by G. S. Brady in 1871. 



