REPORT ON THE AMPHIPODA. 297 



elati, articulo ultimo tantuin tereti ; reliqui simplices." This genus is not noticed in the 

 Brit. Mus. Catal. Boeck points out that it is a synonym of Dana's genus Urothoe, 1852, 

 which, ho says, " can better be seen from Costa's drawing of Egidia pulchella than from his 

 description." The type species, Egidia pulcliella, is figured Tav. iv. fig. 3. 



Of Melita, Leach, a fresh definition is given, and Melita palmata, Montagu, is figured, Tav. ii. 

 fig. 4. 



The genus Noiotrojils is thus defined : — 



" Antennx superiores unisetx. Pedes qicatuor anteriores prehensiles, filiformes, subsequales. 

 Corpus valde conipressum, dorso actde carinatum, ssepius segmentis aliquot in spiiuuii pro- 

 duetts ; epimeris mediss magnitudinis." Spence Bate, Heller and Boeck make this a 

 synonym of Atylus, Leach, and Costa's two species, Nototropis guttatus, Tav. i. fig. 7, and 

 Nototropis sjnnulirauda, Tav. i. fig. 8, are both united by Heller under the name "Atylus 

 Costx." As Costa identifies Nototropis guttatus with " Acanihonotus guttatus, A. Cost, in 

 Hop. Cat. p. 46," the specific name guttatus must obviously take precedence of Heller's 

 specific name " Costx," which will enter into the synonymy, along with spinulicauda, if, as 

 seems probable, that is not a distinct species. 



The genus Amphitlionotus is thus defined : — ■ 



" Corpus modice compressum, dorso capitis thoracisque rotundtdo, abdominis carinato, segmentis 

 2jluribus abdonmiis, aut etiam ultimis thoracis postice spinosis. Antennx superiores unisetx. 

 Pedes quatuor anteriores prehensiles, filiformes, subxqiiales." This genus, already briefly 

 characterized in Hope's Catalogue, 1851, is a synonym of Dexamine, Leach, and the species 

 Amphitlionotus aeanfhophthalmus, which, together with Amphitlioe marionis, Edw., Costa 

 here places in the synonymy of Amphitlionotus marionis, is by Boeck identified without 

 doubt with Dexamine spnnosa. The remaining species, Amphitlionotus spiniventris, Tav. ii. 

 fig. 1, is likewise by Grube and Boeck assigned to the genus Dexamine. 



The genus Epimeria, already instituted in 1851, is here more fully defined : — 



" Antennx superiores unisetx. Pedes quatuvr anteriores prehensiles, filiformes, suhxquales. 

 Corpus dorso in postica thoracis parte ac in abdomine carinatum et spinosum. Epimera 

 quarti et quinti articuli thoracis mcuiina, simul chjpcum semilunar e formaniia. Abdomen 

 lamina horizontali terminatum." The type species, Epimeria tricristata, Tav. ii, fig. 2, is 

 identified by Bate and Westwood, ii, p. 528, and by Boeck, with Gammarus corniger, 

 Fabricius, so that it becomes Epiitneria cornigera, Fabr. 



The genus Probolium is thus defined : — 



" Antennx supei-iores unisetx. Pedes quatuor anteriores prehensiles, primd minores, secundi valde 

 majores, manu maxima. Corpus dorso rotundatum inerme, utrinque lorieatum, lorica ex 

 epimeris tertii et quarti articuli eonnatis pi'xcipue constituia." The type species is Probolium 

 polyprion, Tav. ii. fig. 3 (not 5), which Boeck found, upon examination, to be without 

 mandibular-palp. The genus he was accordingly able to identify with Stenothoe, Dana, 

 1852. The second gnathopods in Stenothoe polyprion have a remarkable likeness to those 

 of Microprotopus rnacidatus, Norman. 



IJndiM Amphitlioe, Leach, Costa places several species; Section A, 1. " Amjjhithoe Prevostii," 

 M.-Edw., which is rather to be called Hyale prevostii ; 2. Amphitlioe bahirussa, A. Costa, 

 Tav. ii, fig. 5, called Allorchestes Babicus in the Brit. Mus. Catal.; 3. Amphitlioe garxlla, 

 Tav. ii, fig. 6 ; 4. Amphitlioe aquilina, Tav. ii, fig. 7 ; 5. Awpliithoe tenella, Tav. ii, fig. 8, 

 which, with the two preceding species, may be called Hyale gazella, Costa himself noticing 

 that aquilina is intermediate between the other two ; in Section AA, 6. Amphithoe inxquipes, 

 Tav. ii, fig. 10, already established in 1851 ; 7. "Amphithoe Pausylipi," a change in the 

 spelling of "Amphitoe PausilijJx," M.-Edw., 1830 ; 8. Amphitlioe crassicornis, Tav. iii, fig. 1 ; 

 9. Amphitlioe penicillata, Tav. ii, fig. 9, which is probably a synonym of " Ampliithoe 

 Vaillantii," Lucas, 1849 (see Note on Catta, 1876); 10. Amphithoe gracilis, Tav. iii, fig. 4 ; 

 (zooL. CHALL. EXP. — PART Lxvu. — 1887.) Xxx 38 



