30 Mr. P. H. Gosse on neiv or little-known Marine Animals. 



have not been able to find any trace of such a species in the 

 ' Comptes Rendus ' for that period. 



The only British marine Mite yet recognized, so far as I am 

 aware, is the Halarachne halichceri of Professor AUman, which 

 is widely different from these in form and habit, being parasitic 

 within the nostrils of a Seal. 



The form now described I cannot refer to any of the published 

 genera : the dorsal shield seems to locate it among the Oriba- 

 tada, and near to Belba and Galumna; but in the form and 

 structure of the rostrum, there is a curious affinity with Raphi- 

 gnathus among the Trombidiadce. 



Class CRUSTACEA. 



Order Podosomata. Fam. Pycnogonid^. 



Genus Phoxichilidium (M.-Edw.). 



P. olivaceum (mihi). Plate III. figs. 12, 13. 



Rostrum thickened at each extremity, hollowed in the middle, 

 |rds as long as first joint of mandibles ; the portion of the first 

 segment of body anterior to the first pair of legs, about as long 

 as rostrum ; fourth joint of first pair of legs dilated ; all the legs 

 four times as long as the body ; colour olive. 



This species is perhaps one of the man?/ British forms of this 

 family, which Leach says were in his possession, but which he 

 had not had an opportunity of determining. I found it at Wey- 

 mouth, in the low spring-tides of A])ril. The characters above 

 given are those in which the specimen diflfered conspicuously 

 from the P. coccineum of Dr. Johnston, by comparison with his 

 figures in the ' Mag. of Zool. and Bot.' i. pi. 13. My specimen 

 was ^th of an inch in length, exclusive of the members ; a female, 

 bearing the globose egg-masses that characterize the genus. 

 Fig. 12 represents it of the nat. size; and fig. 13, the fore-parts 

 magnified. 



Order Edriophthalma. Fam. Cyamid^. 



Genus Cyamus (Fabr.). 



C. Thompsoni (mihi). Plate III. fig. 11. 



Body about ^th of an inch in length. Five pairs of feet equally 

 developed ; all 5-jointed ; all with the penultimate joint large and 

 ovate. Third and fourth segments each furnished with a single 

 small oval api)endage. 



This s])ccics was obtained by Mr. Wm. Thom])Son of Wey- 

 mouth, alter whom I have named it. It was attached to one of 



