fiAMMARIDJ-:. 1.5( 



duiiflc of the iuforior halt' the loiigtli of the antennae: tlapelhini 

 scarcely lon<i;er than broad; that of the superi(»r pair carrying; 

 one hair and one short auditory cilium to each articnlii.s. First 

 pair of gnathopoda smaller than the second. Second pair of 

 gnathopoda like the first ; carpus enlarging towards the pro- 

 podos ; propodos gradually narrowing towards the extremity ; 

 palm imperfectly delined, ciliated. Pereiopoda short ; throe pos- 

 terior pail's having the dactyla revei"sed. Thi-ee posterior pairs 

 of pleopoda subequal ; penidtimate the shortest ; ultimate naked, 

 ha\'iiig the rami twice as long as the peduncle. Telson short, not 

 mudi longer than broad, deeply cleft, each division carrying a 

 subapical spine. 

 Length i of an inch. 



Hah. Moray Frith {Rev. G. Gordon) ; Tenby {Mr. Webster) ; Coast 

 of Morbihan {M. Edivards). 



5. Atyliis gibbosus, n.s. (Plate XXVI. fig. 3.) B.M. 



Fourth segment of the pleon elevated into an obtuse tooth, which 

 looks lilie a hump upon the posterior part of the back of the 

 animal. Eyes round. Antennoc slender, subequal, more than 

 half the length of the animal. Fii'st pair of gnathopoda slender, 

 having the carpus a little longer than the propodos ; propodos 

 having the palm slightly convex, oblique, at a similar angle with 

 the inferior margin, defined by two small hairs. Second pair 

 of gnathopoda a little longer than the first ; carpus shorter than 

 the propodos ; propodos with the palm oblique, straight, defined. 

 Pereiopoda subequal ; in all, the mera are long and the carpi short, 

 and both dilated and produced into an angle posteriorly and 

 distally, and edged with spines as long as the joints are broad ; 

 tlie dactyla are all directed posteriorly. Three posterior pairs of 

 pleopoda unequal, the ultimate being as long again as the two 

 preceding. Telson as long as the posterior pair of pleopoda, 

 pointed, with two short spines on each external edge, cleft fi-om 

 the apex to the.ba.se. 



Length ^ths of an inch. 



Hah. Shetland (Mr. Barlee). 



6. Atylus austrinus, n. s. (Plate XXVI. fig. 4.) B.M. 



Dorsal surface not denticulated. Eyes oval, Superior an ten nee 



half as hmg as the animal ; peduncle one-third the length of the 



fljigclliim ; ailicnli of the fiagclluni broader than long, each carrying 



distallv. aliovr and below, short seta:. Inferior nntenna^ a little 



