30 Mr. P. H. Gosse on new 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- 

 tadiSy and near to Belba and Galumna; but in the form and 

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

 ffnathus among the Trombidiada. 



Class CRUSTACEA. 



Order Podosomata. Fam. PYCNOGONiDiE. 



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 many 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 April. The characters above 

 given are those in which the specimen differed 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^e. 



Genus Cyamus (Fabr.). 



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



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 appendage. 



This species was obtained by Mr. Wm. Thompson of Wey- 

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



