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



of the body serrated." " CJijpeus acute ; antcnnse nearly equal, short, stout, attaining the 

 hase of the sixth segment of the body ; eyes large, black, oval, placed at the outer base of 

 the superior antennae, and approximated above ; hands with about three equidistant, pro- 

 minent, spinose teeth on the inferior edge or palm, the nail or thumb curved, acute, and 

 attaining the third tooth ; eighth, ninth, and tenth segments of the body serrated, the last 

 more conspicuously so. Length, two-fifths of an inch. Eemarkable by its large eyes, short, 

 stout antennae, and serrated appearance of the hind part of the back, occasioned by the 

 elevation of the tip of each of those segments above the base of the succeeding one." 

 Spence Bate renames it Acantlwnotus Saiji. Say's Talitrus longicornis is transferred by 

 Milne-Edwards to Orchestia, as his Talitrus grillus, Latr. from Bosc, is by Spence Bate. 

 He thus describes his new species, Podocerus cijlindricug, which S. I. Smith, 1874, with- 

 draws from the synonymy assigned to it in the Brit. Mus. Catal., p. 256, renaming 

 it Corophium cijlindricum : — "Hands of the second pair somewliat cylindrical; eyes small, 

 not prominent. InhaUts Egg Harbour." "Eyes small; front acute; superior antenna: 

 attaining the tip of the third joint of the inferiores, inferior anteniix much thickened, 

 hairy, the terminal joint shorter than the preceding one ; liand of the second pair not larger 

 than the carpus, ^;a/»J longitudinal, rectilinear, thumb much shorter than the hand ; third, 

 fourth, and fifth pairs of feet short, much compressed, nail as long as the preceding joint, 

 which is suboval and narrower than the one before it ; sixth and seventh pairs reflected, 

 and of the usual cylindrical, elongated form. Length less than three-twentieths of an inch." 



The new genus Unciola is described as follows : — " Essential Character. — Antennx subpediform, 

 superiores with an articulated seta at the base of the fourth joint ; anterior feet mono- 

 dactyle; second pair with adactyle compressed hands; coxx not dilated. Natural Char- 

 acter. — Head deejjly emarginate beneath the eyes to receive a segment of the base of the 

 lower antennaB (ear 1), and projecting into an acute angle between the bases of the upper 

 antennse ; eyes hardly prominent, placed on a somewhat advanced portion of the head, 

 between the bases of the upper and lower antennae ; antennx robust, terminal joint of the 

 superiores rather longer than the preceding one, furnished at base with an articulated seta, 

 inferiores rather shorter, thicker, terminal joint shorter than the preceding one ; Thorax 

 composed of seven segments, each furnished with feet, of which the first pair are largest, 

 hand dilated, monodactyle, second pair with a dilated, compressed, subequal carpus and 

 hand, the latter simple, with two minute hooks at tip, posterior pair longest ; coxsa simple 

 or not remarkably dUated ; Abdomen of three segments ; natatory feet with the filaments 

 subequal ; tail of three segments, the first and second bearing each a pair of bifid styles, 

 terminal one suborbicular ; with a pair of simple, depressed styles, concealed by the others." 

 The type species Unciola irrorata is thus described : — " Eyes hemispherical ; hands of the 

 anterior feet with a longitudinal palm, and prominent tooth, those of the second pair com- 

 pressed, ciliated. Inhahits Egg Harbour." " Accessory seta of the superior antennae, 

 attaining the fifth articulation of the terminal joint ; eyes conspicuous, rounded ; pialm of 

 the anterior feet a little convex in the middle, a large obtuse tooth at base ; nail attaining 

 the carpus, which terminates so as to appear like a second tooth of the hand ; second pair 

 of feet ciliated, with a subtriaugular hand, segments of the abdomen mucronate each side 

 behind ; colour when recent, pale with very numerous red points. Length, three-tenths of 

 an inch." Say remarks that it approaches Gammarus by the accessory seta to the superior 

 antennse, Fherusa by the form of the second pair of feet, but by various points and general 

 habit " it seems to arrange naturally with Podocerus, Jassa, Cerapus, Atylus, etc." 



The species next described, Capi'ella geometrica, is identified by Mayer with Gaprella acutifrons, 

 Latreille ; Caprella equilihra is still accepted, with the improved spelUng, as Caprella sequilihra. 



In describing the genus Cyamus, Latreille, Say mentions " eyes two ; stemmata two," apparently 

 borrowing an error from previous writers, instead of observing his own specimens. On 



