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



sub triangular; anterior extremity lengthened into a slender and obtusely point* 



process." 



Length -fa in., height fa in. 



Huh. In deep w.ttcr. Isle of Sl<ye and Northumberland and Durham coasts (Rev. A. M. Norman) ; Oban 



{Mr. D. Robertson) ; Aberdeenshire coast (Mr. Dawson). 



Tliis Species appear- to live altogether amongst soft mud, in which it burrows, whence 

 probably, as Sara observes, the entire absence of eyes. Like the preceding species it is 

 of rare occurrence in the British seas; and Sars makes the same remark respecting its 



Norwegian distribution. It occurs also in the Scotch glacial clays. I now believe that 



the form described by me as Q. complexa is merely the young of C. limicola (see 

 iigs.43-4G). 



1 1. ( YTUEiti: GLOBL T Liri:RA, n. sp. (Plate XXXI. fig. 42.) 



Valves, a seen from the side, oblong, subrhomboidal, rather higher in front than 

 behind; greatest height equal to more than half the length. Extremities rounded, the 

 posterior rather narrowed; superior margin straight, gibbous over the anterior hinge; 

 inferior slightly convex, curved upwards behind. Surface marked with a fine ribbed 

 reticulation and bearing four prominent rounded tubercles, three below the dorsal and 

 one above the anterior extremity of the ventral margin ; the shell is swollen below and 

 behind the middle into a rounded elevated ridge or ala. 



Length -if in. 



Hab. Roundstonc, in shell-sand. 



Of this species I have seen only one specimen, and that a single valve ; but its 

 characters are so very different from those of any described form, that I have thought it 

 best to describe it here under a specific name; it is nevertheless possible that it may 



prove to be an immature form of some other species 



** Mandibular pulp fc 



seta. 



the female 



15. Ctthebb 'iTBEitcri ata (Sars). (Plate XXX. figs. 25-41. 



Cyther u tuberculosa, G. O. Sars, loc. cit. p. 37. 



Cythere mutabilis, Brady Trans. Zool. Soc. vol. v. p. 877, pi. lix. figs. 12-14. 



British t pc .Distribution: /^-Baffin's Bay, Great Britain, Ireland, Norway, Bay of Biscay, 



West Indies. Fossil— Glacial clavs and 



r 



Nor 



Shell of the female, as seen from the side, elongate quadrangular, highest in front 



greatest height equal to more than half the length; a large rounded tubercle in front of 



He centre, and two elongated tubercle* or ridges, one ventral and one dorsal, near the 



binder extremity ; these last are very conspicuous in young specimens, but become 



»hli?r"l i l!!f,* iS \ I t"^ llK °^ n ™'? ° f ' «"*** several specimens, apparently referable to this species 



jacia. cW, y KSrS - Cr0SSkT " d E0beHS0n » «- « rf *J -searches a,„„ngs, the Seoul* 





