DUBLIN NATUBAL HISTOBY SOCIETY. 159 



racteristic of the species). Another curious form had the the rostrum 

 very much curved upwards, apex simple, and teeth below absent. These 

 all were from the same pools, in company with the next species, Mysis 

 chameleon, Carcinus mcenas, Cancer pagurus, and that strange edrioph- 

 thalmous Crustacea, Apseudes talpa, its first record, I believe, on the 

 Irish coasts. 



For distribution, see Paper read in April. 



H. Cranchii (Plate X., Figs. 7 and 8). — In the same pools with last, 

 but rarer ; in spawn in May ; spawn of a chocolate-brown colour ; va- 

 rieties with three and four teeth on the rostrum occur. 



H. pusiola {Kroyer) (Plate IX., Fig. 2, a, b, c; and Plate X., 

 Figs. 9, 10). — I first met this species, in 1854, in Dalkey Sound, when 

 I laid it aside as a variety of IT. Cranchii. The constancy of its charac- 

 ters have since caused me to alter this opinion, and, not finding it de- 

 scribed in any of the English or French authorities, I was led to de- 

 scribe it as new, under the name of J?". Andrewsii. Since then, however, 

 a paper of Kroyer' s on the Hippolytes of the North, published in the 

 "Boyal Danish Society's Transactions," has come into my hands, in 

 which I find a species described as H. pusiola, which I must look on 

 as identical with that under consideration : I, therefore, feel compelled 

 to adopt Kroyer' s name, for the present, or until better informed on the 

 subject. 



The species is known to the English naturalists, by whom it is looked 

 on as — that zoological conveniency — a "mere variety" of H. Cranchii; 

 but the characters which mark it out are so constant and trenchant, 

 that I feel no hesitation in asserting its claims to specific distinction, and 

 most probably it will be found to be one of our best-marked northern 

 types, as I have not seen any specimens of it in southern or western 

 collections, and the only notice I find of it in English works is by Dr. 

 Howden, Scotland. 



Hippolyte pusiola {Kroyer). 



Rostrum short, curved upwards; apex acuminate, 3-4 dentate above ; 

 below unarmed; a strong tooth arising from carapace immediately over 

 eye ; median plate of tail 4 pairs of spines ; wrist of second pair of legs 

 4-jointed. 



The whole animal is much larger and more truncate than H. Cranchii; 

 the rostrum narrower ; apex slightly curved upwards, simple ; the ros- 

 trum armed with 3-4 curved teeth above ; external antenna as long as the 

 entire body ; the antennal scale rounded at its inner superior extremity ; 

 the lateral tooth terminal and its peduncle strongly toothed externally ; 

 internal antennae hairy, the inferior external angle of the articulation 

 prolonged into a curved scimitar- shaped lobe, the superior angle pro- 

 longed into a tooth ; second and third articulations also toothed ; ante- 

 rior feet slightly shorter than antennal scale, stout. 



Second pair of feet, — wrists made up of four articulations, the total 

 number in the whole limb being eleven, including the hand ; the first, 

 second, and third very short and somewhat triangular; the fourth, 

 fifth, and sixth long, slender, and equal among themselves ; seventh, 



