REPORT ON THE AMPHIPODA. 513 



on to Ilircella ; Caprella inerniis, a preoccupied name for a species almost beyond doubt 

 identical with Caprella danilevskii, Czerniavski, 1868 ; Caprella ohesa, also a preoccupied 

 name, the species itself being recognised hj Mayer, and accepted by Haswell, as identical 

 with Caprella xquilibra, Say. 



The new genus Ci/pruidia, in the family Gammaridaa, is thus defined : — " Body broad. Pereion 

 and pleon of equal length. Coxse of gnathopoda very small. Coxa3 of the first and second 

 pairs of pereiopoda enormously developed ; and cemented together to form broad and deep 

 lateral shields, concealing almost entirely the gnathopoda and pereiopoda, and extending 

 forwards to the sides of the cephalon, and backwards as far as the posterior border of the 

 sixth segment of the pereion, excavated posteriorly for the amalgamated shallow coxae of 

 the third and fourth pereiojjoda. Coxae of the last pair of pereiopoda very small. Antennae 

 subequal, superior without an appendage. Mandibles with a palp. Maxillipedes unguiculate ; 

 both basos and ischium armed with small squamiform plates. Gnathopoda subcheliform. 

 Pereiopoda slender. Posterior pleopoda biramous. Telson single." Mr. HasweU 

 subsequently discovered that the coxae of the third and fourth pereiopoda were not 

 amalgamated, but that the coxa " of the fourth pair is entirely rudimentary and covered by 

 that of the third." This character does not apply to the closely related European species 

 Stegoplax longirostris, G. 0. Sars, or to Cyproidia damnoniensia, Stebbing. The genus 

 Peltocoxa, Catta, briefly described in 1875, is perhajas tlie equivalent both of Cyproidia and 

 Sterjoplax. 



The genus Harmonia (misprinted Harmomia on p. 330, but given correctly on p. 349), is defined 

 as follows, " Coxae not so deep as their respective segments. Superior antennae with an 

 appendage. Inferior antennae longer than the superior pair. Jlandibles with a palp. 

 Maxillipedes unguiculate subpediform, provided with a squamiform plate on the basos only. 

 Gnathopoda subchelate, unequal, posterior pair very large. Pereiopoda stout. Posterior 

 pleopoda biramous, the rami short, conical. Telson single, elongate." Mr. Haswell further 

 remarks of this genus that it " has affinities with Eurystheus and Amathia, but is 

 distinguished from the former by the form of the telson and the stoutness of the pereiopoda, 

 and from the latter mainly by the large size of the posterior gnathopoda." For a different 

 view adopted later, see Note on Haswell, 1885. 



The description of the genus Wyvillea gives " Coxae scarcely so deep as their respective segments. 

 Superior antennce shorter than the inferior pair, appendiculate. Mandibles with an 

 appendage. Maxillipedes exunguiculate, squamiform processes rudimentary. Gnathopoda 

 subchelate, posterior pair very large. Posterior pleojDoda uniramous — the ramus large. 

 Telson simple, undivided." The description of the species, Wyvillea lonf/imanua, speaks of 

 the "posterior pleopoda with the outer ramus broad," as though there were more than one 

 ramus. The figure which Mr. Haswell gives much resembles Ischyrocerus (Podocerus) 

 anffuipes, Kroyer. Mr. Chilton supposes that the description given of the pleopoda 

 is the result of an oversight, and that the genus must be cancelled in favour of 

 Podocerus. It must, however, be observed that Mr. Haswell's description of the 

 maxillipeds is quite inconsistent with this conclusion. 



As a ge7ius incerfx sedis is given the genus Polycheria, with these characters, " pereion broad ; 

 pleon compressed, more or less carinate. Antennae subequal ; sujjerior pair without an 

 appendage. Mandibles exappendiculate. Maxillipedes with well-developed squamiform 



^ process. Gnathopoda small, subchelate. Pereiopoda all prehensile, with narrow basa. 

 Posterior pleopoda biramous with equal rami. Telson double." This genus is evidently 

 synonymous with the genus Tritxta, Boeck, included in Boeck's subfamily Dexaminse. 

 It will probably be right to include Polycheria tenuipies, Haswell, Polycheria hrcvicornis, 

 Haswell, Polycheria ohtiisa, Thomson, and Dexamine antarctica, Stobbing, all under the 

 name of Tritxta antarctica. 



(ZOOL. CHALL. EXP. — PAET LXVII. — 1887.) XxX 65 



