50 THE VOYAGE OF H.M.S. CHALLENGER. 



Ouiscus cusjndaius, the remaining species, was supposed by Boeck in 1870 to be identical 

 with Owen's AcanthosomCi hijstrix, 1835, which was renamed Amphitlwe hystrix by Kr0yer 

 in 1838, and ParampliWw'e liijstrix by Bruzelius in 1859. The latter name was accepted 

 in the Brit. Mus. Catal.,the authors before Boeck not taking notice of Lepechin's Oniscus. 

 Owen's name Acanthosoma being preoccupied, among Hemiptera in 1824 and elsewhere, 

 was changed by Boeck into AcantJiozone, who therefore calls Lepechin's sjiecies Acanthozone 

 cuspidata. Under this name the sjjecies stiU stands, but upon the synonymy above-men- 

 tioned from Owen, Kr0yer, and Bruzelius, which was accepted by Buohholz in 1874, E. J. 

 Miers has since thrown doubt. See his Spitzbergen Crustacea, 1877, in which he points 

 out that Oniscus cuspidatus, Lepechin, Acanthosoma hystrix, Owen, and Acanthozone hystrix, 

 Buchholz, though all belonging to the genus Acanthozone, are probably distinct species. 



1781. Fabricius, J. C. 



Sj^ecies lusectorum exliibentes eorum differentias sj)ecificas, synonyma Auctorum, 

 loca natalia, metamorpliosin adjectis observationibus, descriptiouibus. Tom. I. 

 Hamburgi et Kilonii, mdcclxxxi. 



The Agonata are here still the fourth class, with the genera, Cancer, Parjurus, Scyllarns, 

 Astacus, Squilla, Gammarus. 



On page 511, Astacus includes the following entry : — 



" Homari. 7. A. antennis posticis bifidis, corporis segmentis dorso subspinosis, cauda fasciculata, 

 stylis serratis. Iter Norwag. d. 18. IvU.* 



" Cancer dorso carinato serrato. Stroem. Act. Hafn. X. pag. 5. tab. 2. 



" Cancer macrourus articularis, dorso carinato serrato, spinis caudse bifidis. AlUn. Zool. Dan. 197. 

 2358. 



" Habitat in Ooeano Norwagico." For the probability that this species is in fact an Amphipod, 

 the type-species of Bate and Westwood's genus Amathilla, see notes on Fabricius, 1779 

 and 1798. 



On pages 515-518, Gammarus includes twelve species answering respectively to : — 1. Cancer 

 ampulla, Phipps ; 2. Cancer nugax, Phipps ; 3. Oniscus cancelhis, Pallas ; 4. Cancer 

 grossip)es, Linn., and Oniscus volufator, Pallas, but with the specific name longicornis ; 5. 

 Gammarus locusta, Syst, Ent. 418. 1., with references to Linnaius, Pallas, Sulzer, Frisch, 

 Eoesel, Klein, and the remarks, " Habitat sub Europa? maritimis frequentissimus, dorso 

 innatans, etiam in fontibus et fossis. Conf. Oniscus gammarellus, Pall. Spicil. Zool. fasc. 

 9. 57. tab. 4. fig. 8. ;" 6. Gammarus pidex, Syst. Ent. 418. 2. with references to Degeer, 

 Eay, Baster, Gronov, and the remark, "Habitat ad Oceani littora frequentissimus, salicns, 

 piscibus infestus, in branchiis vlcera caussaus ;" 7. Gammarus corniger. Iter Xorwag. ; 8. 

 Gammarus linearis, Syst. Ent. 419. 3., with references to Cancer linearis, Linn., Onisczis 

 scolopendroides, Pallas, to "Mart. Spizb. tab. P. fig. /. Bast. subs. 1. 32. tab. 4. fig. 2.," and 

 the observation " Cancer atomos, Linn. Syst. N'af. 2. 1056. 84. vis. differt.;" 9. Gammarus 

 satinus ; 10. Gammarus stagnalis ; 11. Gammarus esca; the last-mentioned three not 

 being Amphipoda ; 12. Gammarus " Medusarum," Iter Norwag., with references to Pulex, 

 camriformis, Stroem, and Cancer Medusarum, Mtill. Zool. Dan. Prodr. 2355. Of Gam- 

 marus salinus he notes two varieties and adds "An jiotius Monoculus? " 



Among the Synistata, Class III., Oniscus includes, on pages 377, 378, the same Amphipods as 

 in the Syst. Ent. of 1775. These are, 10. Oniscus bicaudatus ; 14. Oniscus spinosus, 

 which is Gu6rin's Cystisoma; 15. Oniscus gibbosus, transferred in 1787 to Gammarus, 

 but properly, like the next species, belonging to the Hyperina ; 16. Oniscus quadricornis, 

 subsequently recognised as a synonym of Gammarus medusarum ; 17. Oniscus ceti. While 



