REPORT ON THE AMPHIPODA. 341 



Antepenultimate pair of pleopoda having the peduncle very sliort, rami long, subfoliaceous. 

 Penultimate pair having the peduncle long, rami styliform. Ultimate pair short, unibranched. 

 Telson single." The authors remark further, " this genus bears a near relationship to that 

 of Phlias of Guerin. The only distinction of importance which we are enabled to discover 

 exists in the form of the posterior pair of caudal appendages ; these are biramous in the 

 description and figure of Phlias, as given by the author in the ' Magasin de Zoologie ' for 

 1836." Of Phlias rissoanus the authors had a specimen at command, but they say " the 

 specimen being small, we were not able to make out the form of the last pair of caudal 

 appendages without dissection, and we felt unwilling to destroy our only specimen," by this 

 means saving their specimen and destroying its use. Such economy was particularly 

 undesirable in the present instance. The genus Perdonotus was instituted to receive the 

 Oniscus tesiudo of Montagu, which was preserved in the British Museum, and had been 

 supposed by Adam White to belong to the genus Acantlwnotus, Owen. See Note on 

 Montagu, 1808. It is only by a minute comparison of the figures as well as the descriptions 

 given by the various authors, respectively, of Phlias serratus by Guerin, 1836, of Pereionoius 

 testudo by Bate and Westwood, and of Icridium fusmm by Grube (1863) 186'!, that the 

 close connection between these three forms can be appreciated. When also the minuteness 

 of the specimens is borne in mind, the possibility of error in one or more of the descriptions 

 will be taken into account. 



At page 242 Dexamine vedlomensis, n. s., is figured and described. This is named Ati/lus 

 vedlomensis, by Boeck. 



Calliope fingalli, n. s., figured and described at page 263, may possibly, the authors say, "be 

 only an exaggerated variety of C. Ossiani." By Boeck both of these species are considered 

 to be synonyms of AmphUhopsis latipes, M. Sars, 1858. 



At page 333 GammareJla normanni, n. s., is figured and described, with the remark that " this 

 animal bears so close a resemblance to the preceding that we are incUned to think that it 

 may only be the female of that species," i.e., Gammarella hrevicaudata, M.-Edw. The 

 specimen described has the flagella of the upper antennae longer than those observed in 

 Gammarella hrevicaudata, though in other respects agreeing with the female of that species. 

 It is possibly a young male. 



The genus Amathia, Rathke, is here (p. 359) renamed Amathilla, Amathia being pre-occuiiied 

 among Polyps, Decajjod Crustacea, and Moths. 



At page 411 is introduced the new genus Elsdadus, thus defined : — 



" Slightly compressed. Eyes on a prominently-advanced lobe between the superior and inferior 

 antennae. Superior antennae without a secondary appendage. Gnathopoda subchelate. 

 Coxae of the third pair of pereiopoda having the anterior lobe as deep as the coxoe of the 

 second. Posterior pair of pleopoda biramous, rami unequal. Telson squamiform, single." 

 This genus has since been recognised as a synonym of Photis, Kr0yer, 1842. The type 

 species, Eisdadus longicattdatus, 6g\iTed and described as new at page 412, is by Boeck 

 considered a synonym of "Photis Reiiihardi," Kr0yer, with which it agrees in the excavate 

 and dentate palm of the second gnathopods. 



1862. Gerstaecker, Carl Eduard Adolph, born 1828 (Hageu). 



Bericht liber die wissentchaftlichen Leistungen im Gebiete der Eutomologie 

 wabrend des Jahres 1861. Arcbiv fur Naturgescbichte. Berlin, 1862. Crustaceen. 

 pp. 528-571. 



