DUBLIN NATURAL HISTORY SOCIETY. 229 



ssepissime terminantibus. Chelis digitis parallelis, elongatis angustis ricto 

 minute denticulato, apice adunco ; maxillepedibus externis articulo se- 

 cundo tertium Eequante. 



Habitat : " Sinum Maris Hibernicae, * Dublin Bay,' dictum." 

 This species combines the characters of the genera Munida and Ga- 

 lathea to a great extent : it manifestly belongs, however, to the latter 

 genus. I have named it after William Andrews, M. R. I. A., whose re- 

 searches into our native zoology and botany have so often been laid be- 

 fore this Society. 



The characters of the narrowed, elongated hands, their comparative 

 freedom from spines, the small size of the species, and the character of 

 the beak, separate it from all described species. For further particulars 

 concerning it, see Supplemental List : it is extremely common. 



ON A NEW AMrHIPOD. BY SPENCE BATE, F. L. S. 

 PLATE XVI. 



Iphimedia {Rathhe, n. a. xx.). I. Eblan^: (mihi). 



Head produced into a rostrum ; antennae unfurnished with secon- 

 dary appendage, subequal ; the last segment of the pereion and each of 

 the three anterior segments of the pleon armed, lateral to the dorsal 

 ridge, with two parallel rows of teeth. 



The three anterior segments of the pleon each armed with a well-de- 

 tooth in the median dorsal line. 



[I. capite rostrato. Antennis simplicibus subaequalibus. Corporis 

 segmentis 8-11, duabus dentium parallelium seriebus, lateraliter arma- 

 tis, 9-11, forte dente medio dorsi, ornatis.] 



This species differs from I. obesa, on which Rathke founded the 

 genus, in several very important points. The rostrum is more incurved ; 

 the infero-posterior edge of each segment is more pointedly produced ; 

 but that which most strongly strikes the notice is the elevation of a 

 well- developed tooth on the centre of the dorsal surface of each of the 

 three anterior segments of the pleon ; whilst on the next succeeding 

 there is a prominence as if a tooth had been arrested in the course of 

 development. 



On each side of the dorsal centre there exists a tooth, formed by the 

 projection of the posterior margin, of each of the three segments that 

 carries a central tooth, as also the last segment of the pereion, on which 

 a central tooth does not exist. 



Lower down on each of the three anterior segments of the pleon a 

 second row of similar teeth exists on the posterior margin, and the two 

 posterior of these same have each the infero-posterior point produced 

 into a tooth ; those upon the third segment are all curved upwards. 



The anterior pair of Gnathapoda (Fig. 5) are simple ; the dactylos 

 in this species is either rudimentary or fused with the preceding joint ; 

 the extremity of the leg is tipped with six strong hairs, curved and re- 

 versely ciliated (Fig. 5a). 



vol. rv. 2 h 



