EEPORT ON THE AMPHIPODA. 321 



a young animal just escaped from the pouch, though it afterwards disappears. In regard to 

 the use of the apparatus, reference is made to the observations of Leukart [Leuckart] upon the 

 development of the Pupiparse, showing that the micropyle may have another function than 

 the reception of zoosperms, namely to act as a funnel for the introduction of nourishment. 

 In the case of Amphipods la Valette suggests that it may serve as a respiratory apparatus. 

 He recognises that the outer egg-skin is completely closed, as well as the sack in connection 

 with the micropyle, hut he thinks that both might be permeable to the medium surrounding 

 them. 



1860. BoECK, Axel, bom 1833, died 1873 (G. 0. Sars). 



Bemserkuinger angaaende de ved de norske Kyster forekommende Amphipoder. 

 Forhandlinger ved de Skandinaviske Naturforskeres ottende Mdde i Kjdbenhavii 

 8-14de Juli 1860, pp. 631-677. 



Boeok thinks it likely that the division of the Amphipoda into the three principal groups, 

 Hyperidse, Gammaridie, Caprellidre, will always retain its value, while with growing knowledge 

 the minor subdivisions must be subject to variations. In his own classification he has paid 

 regard, he says, not only to the form of feet and tail, but even more particularly to parts 

 less open to view, the mouth-organs, the marsupial lamelte and the branchia;. Besides the 

 characters already in use, namely the presence or absence of palps in maxillae and mandibles 

 and the number of joints to the maxillipeds, he considers the form of the inner plate in the 

 first pair of maxillaj and its garniture of hairs to be of high importance. He attaches weight 

 also to the arrangement of teeth and hairs at the upper end of the ojsophagus, although from 

 the difficulty of the investigation he will not for the time delay over these points. He calls 

 attention to a double armature of teeth which the males of many species possess as opposed 

 to the females, and which he notices especially in the mandibles and first and second 

 maxillae. This, on which he no longer lays stress in his great work, is no doubt only a 

 misapprehension caused by the appearances which precede the moulting of the Crustacean 

 skin. 



In his Classification of the Norwegian Amphipoda Boeck places first the tribe Hyperidaj, Dana, 

 because he considers it to be united by a new and very remarkable form, Trischizostoma, to 

 the family Orchestidse, as well as to the genera Anonyx and Opis among the Gammaridae. 



In the subfamily Hyperinae he places " Hyperia Galha, Mont. (Latreillu Edw.)"; Ilyperia 

 spnnipes, n. s. ; Lestrigonus exulans, Kr0yer, and " Lestrigonus Boeclcii," n. s. (presumably 

 named after Professor Chr. Boeck), both of which he subsequently united with Hyperia 

 galha as synonyms of Hyjjeria medusarum, 0. F. Miiller. 



In the second tribe, Prostomatre, Boeck, he places the single new genus and species, " Trischizo- 

 stoma Raschii" Esmark and Boeck, in which, however, the genus at least is assuredly a 

 synonym of Gjierinia, Hope and Costa. 



In the third tribe, Gammaridae, for the first family Orchestidse, he refers to two genera occurring 

 on the Norwegian coasts, but only makes mention of " Allorehestia Nilsonii," Eathke's species 

 which has since been named Hyale nilssonii. In the second family, Gammarida;, he gives 

 the following new species, Anonyx serratus, which he afterwards named Orclwmene serratus; 

 Anonyx pinguis, which becomes Orcliomene pinguis in his later work; Anonyx oltusifrons, 

 changed later on into Menigrates ohtusifrons; '^Anonyx Bruzelii," dropped out of his later 

 works except for a reference in the Index of De Skand. og. Arkt. Amph., to p. 157, from 

 •which it may be inferred that he identified his species with Anonyx gulosus, Kr0yer ; 

 Ichnopus spinicornis ; Urothoii norvegica. Ho then mentions Bailiyporeia pilosa, Lindstr0m, 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 41 



