REPOirr ON THE AMPHIPODA. 453 



somite, caunot exist ; that tlie so-called epimera are portions only of tlie integumentary 

 structure of the appendages of the animal, and that the apodema are formed out of this 

 structure, more or less tliinned out by lateral 'pressure and internal arrangement ; and that 

 the head of the lower types and carapace of the higher are homologically the same, the 

 carajjace being a monstrous development intended for the covering and protection of the 

 more complicated branchial appendages of the higher types" (p. 47). On page 41 it is stated 

 that "the third pair of maxillipedes in the Brachyurous Crustacea are identical with the 

 first jiair of walking-legs in the Stomapoda, Amphipoda, and most of the Isopoda." But, 

 at least as regards the Amphipoda, second gnathopods must have been intended instead of 

 the first pair of walking legs. 



1876. BoECK, Axel. 



De skandinaviske og arktiske Amphipoder, beskrevne af Axel Boeck. Andet 

 Hefte. (Med 25 kobberstuknc Tavler.). Efter Forfatterens Dod udgivet ved 

 Hakon Boeck. Christiania, 1876. pp. 161-713. 



A preface in French by Hakon Boeck explains that, when Axel Boeck died in May 1873, he 

 left his IManuscript almost complete, but the figures not in all cases named. This 

 deficiency Hakon Boeck had to supply to the best of his ability. In regard to the 

 synonymy he was obliged to depend in part, he says, upon the data supplied by Bate and 

 Westwood. His editorial task must have been one of no slight difficulty, and he deserves 

 the gratitude of the student for his labours. 



At page 190 is given Opisa, new genus, thus defined : — 



"Mandibulse palpo profundius qvam tuberculo molari affixo. Maxillre Imi paris lamina 

 interiore angusta, non longa, in apice setas duas plumosus gerenti, Maxillse 2di paris 

 laniLnis angustis, non vero longis. Pedes maxillares lamina exteriore elongata, angusta, 

 in margine interiore dentioulis instructa, fere ad finem articuli palpi brevis 3tii porrecta ; 

 articulo palpi 4to ungviformi. Pedes Imi paris manu permagira, inflata, in angulo 

 inferiore antico producta et acuta. Appendix caudalis praelongata, profunde fissa." 

 Kr0yer's name for this genus, Opts, was preoccupied. 



For Opis le2jtofhela. Bate and Westwood. 1868, Boeck here proposes a new genus, to 

 be called Lepitochela, of which he says, " I Munddelenes Bygning afviger den ikke saa 

 meget fra slaegten Anonyx, men dog isser derved, at KJ8ebef0ddernes ydre Plader ere 

 temmelig smale og Vfebnede med smaa Tsender istedetfor Knuder paa den indre Rand. 

 Springffldderne ere forlasngede, og Halevedhsenget er sairdeles langt, dybt kUivet." By 

 the structure of the first gnathopods it ajsproaches, he says, the Oedicerinje. Besides that 

 Lejitochela contravenes the rule against adopting a specific name as generic, it falls as a 

 synonym to the earlier Euontjj; Norman, 1867. 



The Iphimedinae are accidentally introduced at page 235, as Subfamilia V. of the Gammaridic, 

 instead of coming later as Subfamilia VII. of the Leucothoidas. Among these the first 

 genus is Acanthonotoxnma, A. Boeck. This name supersedes the earlier Acanihomitus of 

 Owen and Verfumrms of White, both of which are preoccupied. Acantltonotozoma itself 

 might have been presumed to be an accidental misspelling or misprint for Acantlwnotosoma, 

 but that it occurs several times without variation. It is thus defined : — 



"Labium superius prrelongatum. MaxilliB Imi paris palpo 2articulato ; articulo Inio longo ; 

 lamina interiore permagna, triangular!, multis setis plumosis instructa. Pedes maxillares 

 palpo robusto ; articulo palpi ultimo parvo. Pedes Imi et 2di paris graciles, manu sub- 

 cheliformi destituti ; articulo .5to Imi paris prrelongato, gracili ; ungve in margine postico 

 perserrato. Corpus compressum ; epimeris magnis, rigidis." 



