1630 THE VOYAGE OF H.M.S. CHALLENGER. 



den darans entstehenden Bachen, wo sie den Fischen und namentlich den Forellen eine 

 gute Nahrung liefern. Bei Prag kommen sie am nachsten im Cibulkabache vor und haben 

 Exeruplare von dort haufig in ihrem Darmkanal einen Echinorhynchus." 



" Gammarus puteanus, Koch. [Fig. 100]. Das vorletzte Glied des ersten Fusspaares ist scbief 

 viereckig, vorne viel breiter als binten. Augen fehlen. An dem hinteren Eande der ersten 

 drei Leibessegmente sebr feine Stacheln, an den letzten drei fehlen die Borstenbiindel. 

 Farbe stets weiss." 



The figures would require discussion, only that they seem to be of a conventional character. In 

 the definition of the genus Gammarus, it can scarcely be necessary to give the number of 

 joints in the accessory flagellum of the upper antennae. 



1873. Godet, Paul. 



Bulletin de la Societe des Sciences naturelles de Neuchatel. 1870 a, 1873. 

 Tome neuvieme. Neuchatel, 1873. Seance du 21 decembre 1871. pp. 153-155. 



Of three specimens of Gammarus found in a well at Neuchatel, the largest measured, without 

 the antenna?, 32 mm. in length, the smallest about ] 2 mm. The largest was distinguished 

 by the extraordinary length of the last uropods. " The species is distinguished," Godet 

 says, " from our Gammarus ffuviatilis by the following characters : — absence of eyes : 

 penultimate joint [hand] of the two pairs of anterior feet [gnathopods] of triangular 

 shape, almost as broad as long : upper antennas very long, of about 51 joints." He 

 compares it with the somewhat obscure Gammarus puteanus of Koch, and with the Gam- 

 marus puteanus of La "V alette. To judge by the figure, it cannot be far remote from 

 Nipliargus aquilex, Schiodte. 



1873. Hesse, Eugene. 



Memoire, &c, see Note on page 417. 



There are some difficulties connected with M. Hesse's description and figures of bis species of 

 IcMhyomyzocus, which require discussion. The dorsal view, fig. 3., of " IcMhyomyzocus 

 Morrhux" is strongly suggestive of Lafystius sttirionis, Kr0yer, 1842, a species which has 

 been taken, according to Bruzelius, on Gadus morrhua, Acipenser sturio, and Galeus 

 canis, according to S. I. Smith, in the mouth of a goose-fish (Lophius americanus), and 

 which is labelled in the Challenger collection as taken parasitic on Coitus. There 

 seems a strong improbability that the cod should have two parasitic Amphipods so like 

 one another in general appearance, in the head, antennae, claws, and uropods, as Lafystius 

 sturionis and IcMhyomyzocus morrhux, if these are to be considered distinct species. 

 On the other hand, if they are the same, M. Hesse's account is open to much criticism. 

 Of the seven rings of the thorax (peraeon-segments), he says that " aucun d'eux ne 

 presente de pieces epimeriennes sur les cotes," whereas in Lafystius sturionis all these 

 segments have the usual side-plates. He represents the first three pairs of thoracic legs 

 as practically all alike in form and direction, and similarly the last four pairs, whereas in 

 Kroyer's species the two pairs of gnathopods differ as usual to some extent from the 

 first two pairs of perseopods, and, though all the five pairs of peraeopods are very much 

 alike, the first two pairs according to rule face the last three, not one another. 

 IcMhyomyzocus morrhux and ichthyomyzocus lophii are placed under the heading "B. — 

 " Abdomen forme de cinq articles et termine par trois paires de tiges," yet in the 

 specific description of the former we read " l'abdomen contient aussi sept anneaux," 



