1879.] THE COREAN AND JAPANESE SEAS. 31 



from the typical A. tomentosus and the species or variety desig- 

 nated ^. affinis by Dana (U.S. Expl. Exp. xiii. Crust, i. p. 198, 

 pi. xi. fig. 3), from the Paumotu or Society Islands ; yet I find no 

 characters which would justify me in considering them a distinct 

 species. 



Leptodius exaratus, var. 



Chloi-odius exaratus, A. M.-Edw. Hist. Nat. Crust, i. p. 402 

 (1834). 



Xnntho affinis, De Haan, Faun. Japon., Crust, p. 48, pi. xiii. fig. 

 8 (1835). 



Two very small specimens of a Leptodius, without particulars re- 

 garding locality, appear to belong to a well-marked variety of the 

 common L. exaratus, or even to a distinct species. As the speci- 

 mens are immature, it is not advisable to give them a distinct spe- 

 cific name. The carapace is depressed, the areolets scarcely marked 

 and somewhat eroded towards the front and antero-lateral margins ; 

 the three posterior antero-lateral marginal teeth are small and sub- 

 acute, the others obsolete ; the frontal lobes are broad, with the an- 

 terior margin straight, and they are separated by a very small 

 median notch. The anterior legs have the wrist and hand very ru- 

 gose on their upper and outer surfaces ; the ambulatory legs some- 

 what dilated and compressed, and the tarsal joints very narrow. 

 JiCngth 3 hnes, breadth 4g lines. 



Eriphiid^. 

 piltjmnus hirsutus. 



Pilumnus hirsutus, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 37 

 (18.58). 



The large series collected agree in all respects with Stimpson's 

 diagnosis. The outer orbital spine is smaller than the three spines of 

 the antero-lateral margin, which are acute. The larger hand (which 

 is usually the right, but in some individuals the left) is granulated 

 on its upper, and in younger specimens more minutely on its outer, 

 surface ; the lower finger is usually in a straight line with the lower 

 margin of the hand. The smaller hand is granulispinulous on its 

 upper and outer surface. In one or two specimens the granules are 

 fewer and more acute, and the lower finger forms a slight angle with 

 the inferior margin of the hand. 



This is evidently a very common and abundant species in the 

 Corean seas. Specimens were collected at seven different localities 

 in or near the Corean Straits, at depths varying from 1 2-40 fathoms. 

 It was, however, previously unrepresented in the British-Museum 

 collection. 



I should have regarded this species as being synonymous with the 

 Pilumnus minutus of De Haan (Faun. Jap., Crust, p. 50, pi. iii. 

 fig. 2), which is very shortly characterized, were it not that the an- 

 tero-lateral margins are described and figured as "4-dentatis" (not 

 spinose), and the orbits as " inermibus " by De Haan. 



