460 MR. G. S. BRADY'S MONOGRAPH OF 



more than satisfy myself respecting its sex and genus. Though very abundant in the 

 shell-sand from Dog's Bay, near Roundstone, these specimens consist only of detached 

 valve; and I have not detected it in my own dredgings from Roundstone and Birterbuy 



R-ivs. 



(J. 1 \ k vdoxostoma hibernicum, n. sp. (Plate XXXV. figs. 35, 36, and Plate XL. 



fig. 7.) 



C.i raj ice of female, as seen from the side, oblong subelliptical, rather higher behind 

 than before; greatest height equal to less than half the length. Extremities nearly 

 << 1 1 lally rounded; superior margin gently and evenly arched; inferior slightly sinuated 

 in front. Outline, as seen from above, compressed oval ; extremities equally acuminate ; 

 greatest width in the middle, equal to rather more than one-fourth of the length. Male 

 unknown. Shell smooth and polished ; colour (of spirit specimens) a uniform ashy grey. 

 Upper antennae very slender, one very short slender seta at the apex of the third and 

 fourth joints ; fourth joint nearly twice as long as the third, and more than twice as long 

 as the fifth and sixth united; fifth joint twice as long as the sixth. Terminal claws of 

 the feet short, thick, and abruptly curved; penultimate joint of the third foot much less 

 than half the length of the preceding, bearing five strong spinous setae on the anterior 

 margin. Basal portion of the male copulative organs moderately large, rounded ; distal 

 portion small, elongated triangular, acuminate. 



Length -fa in. 



Arran 



M. Norman) 



7. Paradoxostoma sarniense, n. sp. (Plate XXXV. figs. 26-29, and Plate XL. fig. 9.) 



Carapace of the female, seen from the side, oblong elliptical, rather higher behind 

 than in front ; dorsal and ventral margins nearly parallel, greatest height equal to less 

 than half the length. Anterior extremity obtusely, posterior obliquely rounded ; superior 

 margin perfectly straight ; inferior straight in front, convex behind, much compressed, 

 and forming a prominent keel. Outline, as seen from above, excessively compressed, 

 more than four times as long as broad, extremities equally pointed. Shell smooth, 

 pellucid, ornamented on the dorsal and ventral portions of the valves with dendritic 

 black or dark-brown markings. Lower antennae very slender, scarcely thicker than the 

 stout but slenderly pointed flagellum ; one terminal claw. Penultimate joint of the 

 third foot one-third the length of the preceding, anterior margin finely ciliated ; terminal 

 claw slender. Male unknown. 



Length ■£$ in. 



Hah. Guernsey and Herm, in rock-pools, and Falmouth (Rev. A. 

 from the Channel Islands (G. S. B.\. 



M. Norman) ; and in shell-sand 



A very beautiful and remarkable species, differing from the preceding chiefly in its 

 colouring, its less flexuous outline, and its greater lateral compression. 



8. Pahadoxostoma ensieorme, n. sp. (Plate XXXV. fi«*s. 8-11.) 



Atlantic 



Distribution : ftece^-Britain, Ireland. .FW-Glaeial, Scotland, Ireland. 



