REPORT ON THE AMPHIPODA. 293 



Kroyeranus," afterwards assigned to SiphoiuBcetes {Cerapus) ivMtei, Gosse, witli a suggestion 

 in the Brit. Sess. Crust., p. 467, that it may probably be the female of Siplionaecetes 

 ty2ncus ; by Boeck it is united to Ccrajius ahlitu^, Templeton ; Siplwnocetus crassicornis, 

 by G. 0. Sars renamed Ceraptcs erasdcornis ; Dyopedos porredus, afterwards named 

 DulicMa porreda ; Dyopedos faleatus, afterwards named Dulichia falcata; " Proto 

 Goodsirii," no doubt the same as Proto vpntricosa, 0. F. Miiller. 



The new genera are exjalained as follows : — Family I. Orchestidee ; thus defined : — " The 

 upper antenna shorter than the lower. The coxae well-developed ; the posterior pleopoda 

 short and robust, the last being single." Genus 3, Galanthis, "Lower antenna scarcely 

 longer than the upper. Mandible non-palpigerous. Posterior pleopoda Orchestiform. 

 Telson divided." This genus, in the Brit. Mus. Catal., is made a synonym to Nieea of 

 Nicolet, in my view identical with Hyale, Rathke. 



" Family II. Gammaridaj. Body compressed. Legs long and slender. Posterior pleopoda well- 

 develoi)ed, the last being generally the longest. 



" Subfamily I. Stegocephalides. Antennae subequal. Coxpe of the four anterior legs immensely 

 developed." 



Genus 1, Montagua, "Upper antenna without secondary appendage. Mandibles non-palpi- 

 gerous. Hands of both gnathopoda subcheliform. Posterior pleopoda single-branched. 

 Telson entire." The name Montagua was pre-occupied. The genus falls to the earlier 

 Stenotlioe of Dana. Spence Bate included in it some species which had the mandibles 

 j)alpigerous ; these have been referred by Boeck to his genus Metopa. Proholium, Costa, 

 is likewise a synonym of Stenotlioe. Costa did not describe the mandibles, but in the 

 type-species, Proholium polyprion, Boeck found them to be non-palpigerous. 



Genus 2, Danaia, " First pair of gnathopoda simple ; last pair of pleopoda with a single stylet." 

 In the British Sess. Crust., vol. i. p. 67, a fuller definition is given as follows. " Antennae 

 subequal. Superior antennae without secondary appendage. Mandibles destitute of a 

 palpiform appendage. First jsair of gnathopoda simple. Second subchelate. Telson single." 

 Boeck in 1870 established a new genus Cressa, with type-sjiecies, Cressa Schtodtei, 

 distinguished from Bate's Danaia by having a very long triarticulate mandibular palp. 

 G. O. Sars, 1882, says that my figure of Danaia duhia, 1876, shows clearly that it is 

 identical with Boeck's Cressa Sdiiodtei. In that case the later definition of Danaia requires 

 amendment. My own specimens of Danaia duhia were destroyed by an accident, before my 

 attention was called to the special interest attaching to the mandibles. 



" Subfamily II. Lysianassides. Upper antenna short, pyriform. Second gnathopod long, 

 feeble, and obsoletely subcheliform." Genus 4, Scopelodieirus : — Upper antenna furnished 

 with a secondary appendage. First pan- of gnathopoda terminating in a brush; second 

 cheliform. Telson double." This geniis had been anticipated by Gallisoma, Costa. See 

 Brit. Mus. Catal. p. 84. 

 " Subfamily III. Tetromatides. Eyes foui' ; not compound. Upper antenna in advance of the 

 lower." Genus 6, Tefroinafus: — "Head projecting forward as a snout. Upper antenna 

 proceeding from the extremity ; lower situated far posteriorly. Mandible palpigerous. 

 Gnathopoda but imperfectly prehensile." This genus was soon after recognised as equivalent 

 to Ampelisca, Kroyer. 

 " Subfamily IV. Pontoporeides. The .shell of the head developed anteriorly beyond the head so 

 as to look like a hood. Upper antenna situated in advance of the lower." Genus 7, 

 Westwoodia : — " Shell of the head produced to a point. Upper antenna not appcndiculated. 

 Telson entire." The name Westwoodia being pre-occupied was soon after altered to 

 Westivoodilla. Genus 8, Kroyei-a : — " Head like Westwoodia. Hands of gnathopoda well- 

 developed, and formed by the carpus being produced so as to meet the apex of the dadylos." 

 In the Brit. Mus. Catal., p. 104, Kriiyera carinata, the only species assigned to the genus 



