ON THE Ly.sIAXASSA MAGELLANICA ETC. 33 



also short, have the inner branch very broad, and the outer much narrower. 

 The maxillipeds (fig. 51) are also short, but have the laminae exteriores very 

 large, and reaching about to the end of the 2 nd joint of the palp. The inner 

 lamina? are wery short, armed with coarse ciliated bristles at the end and 

 inner side. The exterior laminae have the internal margin almost smooth , but 

 immediately within the edge is a row of about 7 short spines , directed for- 

 wards, the points of which reach beyond the edge of the laminae, by which this 

 latter shows itself to be thinly set with spines. At the point they have a long 

 spine and beyond that three bristles. The hands of the first pair of feet 

 approach in form those of the genus Lysianassa, tapering towards the point, 

 almost conical, and the palm-edge not clearly defined. But the claw is 

 moveable and in some measure doubled back upon the posterior edge of 

 the hand. The whole back edge of the hand is furnished with small spi- 

 nes , and in front of these are a few (5) of larger dimensions. The claw 

 is not, as Kroyer states, divided at the point, but has however on the 

 inner side an almost invisible prickle. The branches of the last pair of 

 caudal-feet are distinguished by having, like those of the genus Hyperia, 

 fine sawteeth, the outer branch only on the inner margin, but the inner 

 branch on both margins. 



It is found in the branchial-sack of Ascidice on our western coast 

 from the southern part of the Kattegat at least up to Christianssund in 

 Norway. 



\. Gen. CALLISOMA, A. Costa. 



Cum genere Anonycis maxima ex parte congruens, distinguitar tamen: 

 Pedes trunci l:mi pari* iisdem 2:di parvs nen crassiores, iiiterdnm grariliores, 

 sed longiorcs, ungue obsoleto vel absente. Ramus interior ma.rillarum l:mi 

 paris setis ciliatis sat multis praeditxs. — Laminae exteriores ma«iUipedum 

 margine interiore aculeato. Aculei ad apicem palpi maxittarwm l:mi paris 

 bifurcati. 



Of this genus 4 species arc known, two froni Naples (Callis. Hopei 

 and pnnctatum A. Costa), 1 from England (Callis. crenata. S. Bate), and 

 one from Sweden and Norway. 



1. C. KROYERI (Bruzelius). 



Anonym Krdyeri, R. Bruzelius: Skandinaviens Amphipoda Gammaridea, 

 pag. 45, tab. II, fig. 7. 



Callisoma „ C. Spence Bate : Catalogue etc. pag. 371. 



Nova Acta Reg. Sue. Sc. Dps. . III e Sc ; rk'. 5 



