•7 



MR. G. S. BRADY'S MONOGRAPH OF 



Cttheroptbbon rectum, nov. sp 



Carapace, as seen from the side, oblong, sub quadrangular, nearly equal in height 



o 



margin 



liout ; height equal to less than half the length ; extremities rounded ; superio 



small protuberance 4 



straight, terminating abruptly 



at each extremity in a 



inferior almost straight; dorsal aspect oblom? subovate. widest behind the middle 



ddenly 



USU SSLlcllglH/ , U.VXOUJ. t*ojj^v vw^w^j, ^~„^. , 



ustricted at the posterior third; extremities pointed 



idth rather more 



than the height 



Shell-surface closely and minutely punctate; lateral ala not very 



prominent, rounded off in front, abruptly angular behind 



in. 



Length ^ 



One specimen only was dredged, by Mr. D. Robertson, in Lerwick Bay, Shetland 



depth of 12- 



fathoms 



Note on Cythere Joxesii. 



In the Mediterranean, the Bay of Biscay, and on the western coast of Ireland, a for 

 which appears to me to be properly referable to this species, but at the 



time 



u-kably different in some minor characters, is abundantly met with. The points m 



delicacy and transparency of the shell, and the 



which it differs are, the much greater 



greater length and slenderness of the entire spinous 



In the position of 



pines and 





al outline of the shell, it does not differ appreciably from the typical 



form of the species. I have no hesitation in identifying it with the Cythereis ceratoptem 

 of Bosquet, and, I think, also with the C. subcoronata of Speyer. The figures given by 

 the latter author seem, indeed, to be widely different, but a specimen which he kindly 

 communicated to me is either identical, or very nearly so, with the form here noticed. 



