REPORT ON THE AMPHIPODA. 595 



Ampliipods, the list beginning with " Isxa Montagid EJw." and " Laphi/sfiiii: durionis 

 Kroy.," and ending with " Pudaliriits typicus Kroy." Altogether the Catalogue enumerates 

 123 species, with notes principally on synonymy and locality. Bathyporeia roberisoni, 

 Spence Bate, is upheld as a distinct species, with the remark that " chez ce dernier type, et 

 quelle que soit sa taille, les articles du fouct des antennes inferieures sont assez allonges, et 

 garnis do volumineuses baguettes olfactives, tandis que chez les B. pelagica de toutes tallies, 

 ils sont extremement courts et ne pr(5sentent pas de baguettes olfactives bien ayiparentes." 

 This distinction between specimens, however interesting in itself, is not, I think, of specific 

 importance apart from other distinguishing characters. On Uruthoe nmrina, Sp. Bate, 

 M. Chevreux observes, " c'est certainement a tort que Meinert considere U. marina comme 

 le male d'CT". breviooniis Sp. Bate; chez toutes les Uroflwe, les males se distinguent des 

 femelles par leurs longues antennes inferieures. M. le Professour Giard a signale, il y a 

 longtemps dt^jk, ce caractfere sexuel. J'ai trouve du reste un certain nombre d'f/". marina 

 portant des oeufs." Of Urothoe elegans, Sp. Bate, he says, " c'eet tr^ probablement la 

 forme male d'U. marina." 



Of MonocHloiJes hmyimanus, Bate and Westwood, the antennae are described and figured, 

 PL V. figs. 1-2, and the suggestion is made that this species ought perhaps to be placed in 

 a new genus. 



" Guernea, nov. gen. " in place of Hdhria, Norman, preoccupied, is thus defined: — " Aiitennx 

 superiores flagello appendiculari instructs^. Pedes 1"' et 2^ paris manu suhcheliformi. 

 Pedes 7"" paris setts longis pilumosis instnicti. Segmentmn abdominis 5"""- et 6""" coalita. 

 Pedes saltatorii vltimi paris ii ramosi. Appendix caudalis laminxformis, prof tmde fissa." 

 Of the type species, " Guernea roalita Norman," figures are given in tlie te.Kt on page 5, 

 though referring to the description of the female on page 16. 



Of Elasmopms latip/es, Boeck, found on Maia squinado, it is remarked, page 21, that the male 

 difi'ers from the female (which Boeck describes) in the hand of the second gnathopods, 

 which is much larger, and carries two or three large obtuse teeth on the lower margin, while 

 in the female it is smooth. The hand of the male is represented, fig. 3, on page 6. 



Profomedna pedinafa, Norman, and Protomedeia hirsutimanus, Spence Bate, are here referred to 

 the genus Ptilocheirus, Stimpson. 



Ptiloclieirus trieridatus, n. s., is described at some length, parts of it being represented on page 6, 

 fig. 4, and on PL V. figs. 3, 4. 



Microprotopms longimanus, n. s., is likewise described, with illustrative figures on PL V. figs. 

 5-10, and fig. 5 on page 8 of the text. 



Of Microdeiifopus armafus, n. s., the two sexes are described, and illustrated by fig. 6 and fig. 7 

 on page 9 of the text, and PL V. figs. 6, 7. 



Boeck's Janassa variegata, Leach, is here regarded as an independent species, with " ^ Podocerus 

 capiflatus Sp. Bate and Westwood," for a synonym. 



Under " Ericlitltonius Edwards," a species is entered as " Ericldhonius abditus Templeton, 

 Trans. Ent. Soc. (Cerapms). — Sp. Bate and Westwood, Brit. sess. Crust. (Cerapus). 



" E. bidens, Costa, Cros. amfip). del. Regno di Najioli. 



" $ Dercothoe punctatus Sp. Bate and Westwood, Brit. sess. Crust.;" and a second species as, 



" E. diffurrnis Edwards, Hist, des Crust. — Sp. Bate and Westwood, Brit. sess. Crust. (Cerapus)." 



But from Templeton's description of the tube and habits of his species, it is probable tliat he 

 had in view a true species of Cerapus. On the other hand I believe that the forms named 

 respectively Cerapms abditus, Cerapus diffffrmis, and Dercothoe (Cerapus ?) punctatus, in 

 the British Sessile-eyed Crustacea, are all synonyms of Ericthonius difforniis, Milne- 

 Edwards. I have f(3und them all at Ilfracombe nesting together on tufts of Chondrus 

 crispus Iq the same small rock-pool. There can be little doubt that the so-callcil Cerapjus 

 abditus of this family group is the most fully developed male; Dercothoe I'^'X'datus is 



