REPORT ON THE AMPHIPODA. 325 



of the same size in both sexes. The three hinder abdominal-feet are biramous, the rami 

 conical, without spines. Telson small and thin. 



Of Hela, he says : — "This remarkable new geuus is characterized b3'- a loug, narrow, depressed 

 body ; small, nearly rudimentary epimera ; very long legs, of which the first two pairs are 

 furnished with strong clasping hands, the first larger than the second ; the last three pairs 

 have the first joint not at all dOated, but narrow and cylindrical like the following joints ; 

 the fingers long and conical. The tail is of the usual form, without any of its segments 

 coalesced. Its first three pairs of feet are especially long and thin, the two following 

 pairs biramous, and the last particularly thin, uniramous [grenet for eengrenet], the ramus 

 longer than the peduncle. The mandibles have a divided, dentate point, a prominent 

 molar tubercle, and a thin, triarticulate palp. In the first maxillae the palp is long, thin, 

 two-jointed, the inner plate small, furnished with a few bristles. The maxillipeds are 

 very strong, with four-jointed palps. The branchial vesicles are found at the bases of the 

 legs from the second to the sixth pair." 



As to the new genus ^(jinella he gives his views in two passages ; first he says, p. 670, under 

 JEgina, Kr0yer : — " Kr0yer characterizes this genus by the triarticulate palp of the 

 mandibles, and the biarticulate tail with two pairs of appendages, of which the first pair 

 are biarticulate, the second uniarticulate. Dana refers to this genus some species, which 

 differ from the type species longicornis by the structure of the tail, and he believes that 

 this is of little systematic importance. But, as I have found two new species which 

 completely agree with Kr0yer's characters for ^gina, and besides, a species which is like 

 these in that the mandibles have palps, but the tail of which is constructed as in the 

 genus Cajirella, I think that Dana's species must be transferred from j3Sgina to a new 

 genus, of which this species of mine is the type. To this genus I have given the name 

 ^ginella." On p. 673, under jEginella mihi, he says, " This genus, which forms a link 

 between the preceding genus [yEgina] and that which follows [Caprella], I have already 

 characterized by its not having palps on the mandibles, and by the tail being, as in the 

 genus Caprella, biarticulate, with unjointed appendages" ("ved at den mangier Palpe paa 

 Mandiblerne, og ved at Halen er, som hos Slasgten Caprella, toleddet med uleddede 

 Appendices"). The discrepancy in the second statement is no doubt accidental, there 

 remains, therefore, the single point in which ^ginella difTers from JSgina, namely, in 

 having the abdominal feet unjointed. But Mayer points out, Caprelliden, p. 36, that Boeck 

 is wrong in supposing the abdominal feet in Caprella to be unjointed. It is easy, there- 

 fore, to suppose that he may have made the same mistake in regard to the specimen which 

 he names JEginella, in which case that genus will fall to yEgina, unless, since that is a 

 preoccupied name, ^ginella may be accepted as its substitute. 



1860. Leydig, Franz. 



Ueber Geruchs- imd Gehororgane der Krebse und lusekten. Arcliiv fur Anat. 

 und Physiol. Jahrgang 1860. pp. 265-314. Taf. VII.-IX. 

 See Note on Leydig, 1878. 



1860. LtJTKEN, Christian Frederik, born 4 October, 1827 (C. F. L.). 



Bemaerkninger cm Cyamus, Forliandlinger paa Skandinav. Naturf. ottende 



Mode i Kj0benhavn. 1860. pp. 590-592. 



The preliminary object of these remarks was to show the error of the common supposition that 

 there was only one species of Cyamus in the North Seas. Liitken here distinguishes six 



