EEPOET ON THE AMPHIPODA. 397 



1843, for the species ^gina longicornis, Kr0yer, Cancer phasma, Montagu, which properly 

 belongs to Protella, Dana, ^gina ecJiniata, Boeck, and ^gina Ixvis, Boeck, which Mayer 

 unites to ^gina longicornis, Kr0yer ; JEgineJla spinosa, Boeck; Caprella, Lamarck, 1818, 

 with the species liiiearis, Linne, laficornis, Boeck, longicornis, n. s., eemarkii, Boeck, '^Loveni," 

 n. 8., eeptentrionalis, Kr0yer, punctata, Boeck, hystrix, Kr0yer, of which Mayer makes lati- 

 coi'nis and esmarldi synonyms of Caprella xquilihra, Say, and queries whether longicornis, 

 loveni and punctata be not synonyms of Cajrrella sepdentrionalis, Krpyer ; Podalirius 

 typicus, Kr0yer. 



Subfam. II. "Cyaminee. Kr0yer 1843," in a "Conspectus Cyamidarum borealium hujusque 

 [hucusque] cognitarum. Auctore Chr. Liitken," contains Platycyamus, Ltk., new genus for 

 Cyamus thompsoni, Gosse ; and Cyamus, Latreille. 



The latter genus has the species " Cyamus Mysticeii Ltk.," wdth the " Synonymia : Oniscus ceti 

 Pall., Squilla Baleeni de Gesr, Cyamus ceti Auct. plerumqve. (Oniscus ceti Linn, inde- 

 terminabilis?) ;" " Cyamus Monodontis Ltk.;" " Cyamus Boojns Ltk.," with " Syn. Oniscus 

 ceti Fabr. Faun. Gr0ul. 330."; Cyamus nodosus, Ltk., with "Syn. Oniscus ceti Zool. 

 Dan. iii. tab. cxix. f. 13-17."; "Cyamus Globicipitis Ltk.," with "Syn. Cyamus sp. n. 

 Stp." It may be, and has been questioned, whether Liitken is justified in superseding 

 the old name Cyamus ceti for the species parasitic on the Greenland whale. 



The new genera are described as follows : — 



Div. I. Fam. I. Hyperidse. Gen. III. Parathemisto. " Corpus sat compressum ; dorso 

 carinato. Mandibulas in apice perlatae, serrata, a?qve ut mala interna ; tuberculo molari 

 latissimo, in margine crenato ; palpo longissimo. Maxillfe Imi jjaris dentibus qvatuor 

 perlongis et firmis annatse. Pedes 2di paris (non pedis Imi paris) carpo in angulo 

 inferiore posteriore valde producto ; manu eheliformi. Pedes 3tii 4tiqve paris articulo 4to 

 subdilatato. Pedes trium parium ultimorum subseqvales." 



Fam. II. Tryphanidce. Gen. I. Tryplmna. " Truncus segmentis septem perangustis. Post- 

 abdomen segmentis tribus anterioribus perlatis. Caput permagnum antiee obtusum. 

 Pedes Imi 2diqve paris sat parvi; articulo 5to non subeheliformi. Pedes 3tii et 4ti paris 

 magnitudine et forma aeqvales. Pedes trium parium ultimorum gradatim magnitudine 

 valde decrescenles ; pedes 5ti paris pedibus 7mi paris plus duplo majores." 



Div. II. Fam. III. Gammaridse. Subfam. I. Lysianassinae. Gen. II. Amhasia. " Hypostomum 

 valde gibbosum, prominens. Mandibulse palpo elongato et tenui, profundius qvam 

 tuberculo molari parvo affixo. Maxilte Imi paris lamina interiore minima, ovata. IMaxilte 

 2di paris breves, non lati. Pedes maxiUares laminis exterioribus permagnis, ovatie, vix 

 in margine interiore nodulosis ; palpo brevi ; articulo 4to tuberouliformi. Antennse in- 

 feriores articulo 3tio prselongato. Pedes Imi paris gracUes, manu subeheliformi destituti. 

 Pedes saltatorii ultimi paris breves ; ramo interiore multo breviore quam exteriore. 

 Appendix caudalis brevis, fissa." 



GeiL IV. Socames. " Labium superius praslongatum, prominens, acerrimum, cum hypostomi 

 apice acuto conjunctum. Mandibulse mediocriter elongataj ; palpo multo profundius qvam 

 tuberculo molari prominenti afBxo. Maxillse Imi paris dentibus perlatis ; lamina interiore 

 prtelongata, angusta et in apice duobus setis plumosis instructa. Maxillse 2di paris laminis 

 angustis, elongatis. Pedes maxillares laminis exterioribus ovatis, in margine interne nodulos 

 parvulos gerentibus ; lamina interiore prfelongata ; articulo palpi 2do elongato ; articulo 4to 

 ungviformi. Antennae breves. Pedes Imi paris breves; manu apicem versus attenuata et 

 haud subeheliformi. Appendix caudalis longitudine mediocri, usqve ad medium fissa." 

 Gen. VI. Hippomedon. Mandibular breves ; mala exteriore angusta ; in sinistra dente parvulo 

 accessorio instructs ; palpo in eadem altitudine ao tuberculo molari permagno affixo. 

 Maxillae Imi paris palpo in apice multis, brevibus, latis, parum serratis dentibus instnicto ■ 

 lamina interiore sat brcvi, in apice duabus setis plumosis instructa. Maxillre 2di paris 



