REPORT ON THE AMPHIPODA. 245 



" Sectio B. Pedum primum et secundum x>ar Imifjitudine xqualia," with "Spec. 5. Talitrus 

 platycheles Guerin.' 



" Sectio C. Pedes primi 2yaris secundi paris pedihus hreviores. {Subg. TalitrnrchesUa Twh.)," 

 with " Spec. 6. Talitrus Cloquetii (Audouin) Savigny." 



In further remarks on this last species, of the correct figuring of which he is with some reason 

 rather suspicious, he considers that his proposed new genus or subgenus agrees with Ordiestia 

 fern, by the structure of the first gnathopods, but by the relations of the second gnathopods 

 not entirely either with Orcliestia or with Talitrus, except that in " T. Cloquetii " the first 

 gnathopod appears shorter than the second (as in Orchestia mas.); a circumstance, he says, 

 which led Guerin to make it the type of his Section C. 



The genus Orchestia is arranged by Brandt as follows : — 



"Sectio I. Aiitennai superiores piedimndo inferiorum hreviores. Suhgen. Orchestia noh.) 



" A. Pedum sextum et septimum par longitudine fere aequales vel septimum paullo longius. 



" a) Marium septimi pedum paris tertius et quartus articulus plus minusve dilatati et incrassati 

 Gen. Orchestia Leach M-fs.? 



"a) Fortiter dilatati." "Spec. 1. Orchestia littorea M. Edw."; "Spec. 2. Orchestia Montagui 

 Audouin," expressly including " 0. littorea Rathke." 



" ;8) Satis dilatati." "Spec. .3. Orchestia Euchore F. Miiller;" "Spec. 4. Orchestia platensis 

 Kroyer." 



"y) parum dilatati. (Gen. Scamballa Leach. Mss. e. p.)." "Spec. 5. Orchestia chilensis 

 M. Edw."; "Spec. 6. Orchestia gryllus M. Edw.", the Talitrus gryllus of Bosc. 



" h) Marium septimi pedum paris tertius et quartus articulus nee in maribus, nee etiam in feminis 

 dilatati. (Gen. Scamballa Leach !Mss. List of the Crust, in the Brit. ]\Ius. p. 86.) 



" a) Chelffi marium inferior margo edentatus." " Spec. 7. Orchestia ochotensis n. sp." 



■' /3) Chelae marium inferior margo plus minusve dentatus." " Spec. 8. Orchestia BotteeM. Edw.," 

 which he thus defines, on the supposition of the name belonging to a form brought by 

 Nordmann from the Black Sea, " 0. Bottx (maris nigri). Antennae inferiores corporis 

 tertia parte longiores flagello 20-articulato instructae. Mauus secundi pedum jjaris marium 

 in marginis inferioris dimidio inferiore eminentiis tribus munita, uncoque terminali intus 



denticulate instructa ; " " Spec. 9. Orchestia Deshayesii Audouin Scamballa 



Kuhliana Leach. Mss. teste List of Crust, of the Brit. Mus. p. 86;" "Spec. 10. Orchestia 

 Gryphus F. MiiUer;" "Spec. IL Orchestia Quoyana M. Edw." 



" B. Pedum sextum par septimo longius et latius." " Spec. 12. Orchestia Fischeri M. Edw." 



" Sectio. II. Antemix supieriores jieduiiculo inferiorum longiores. (Suhgen. Allorchestina noh.)," 

 "Spec. 13. Orchestia nidrosiensis Kroyer;" "Spec. 14. Orchestia Pereiri Lucas." 



" Die als Subgenus Allorchestina aufgestellte Gruppe sind Orchestien, welche in dem ansehnlichen 

 Langenverhiiltnisse der obern Fiihler zu den untern sich der Gattung Allorchestes anreihea 

 und sich nur durch den Mangel der .spiitzen Kralle an den Maxillarfiissen davon unterscheiden. 

 Dass 0. nidrosiensis kein Allorchestes sei, geht aus Krdyer's Mittheilung hervor, denn er 

 bezeichnet darin deu ' ultimtis piedimi maxillarium articulus ' bios als ' conicus.' Von 

 0. Pereiri ist die Gestalt der Maxillarfiisse leider weder beschrieben, noch abgebUdet, so 

 dass sie moglicherweise ein echter Allorchestes sein konnte. Uebrigens nahert sich 

 O. nidrosiensis wegen des ultimas articulus pedum maxillarium conicus auch mehr der 

 Gattung Allorchestes, als die in der Sectio I. angefiihrten Orchestien." 



" Orcliestiarum species non satis vel nondum descriptse." "Spec. 15. Orchestia Tristensis 

 (Scamballa Tristensis Leach. Mss.)"; "Spec. 16. Orchestia luegalophthaLmos (Scamballa 

 megalophthalmos Leach. Mss.)." These two might come, he thinks, into his Sect. I. a, y 

 after Orchestia gryllus or into Sect. I. h. He considers " Oniscus gammarellus PaU. SpicU. 

 Zool. fasc. IX. p. 57, PI. TV. fig. 8," and "Oniscus Stroemianus O. Fabric. Faun, groenl. 

 p. 261," also as doubtful species. 



