DuERDEN — On some new and rare Irish Polyzoa. 125 



Localities. — Off the Land's End (R. Q,. Couch) : south-west of 

 Polperro (T. Hincks) : Guernsey (A. M. l^orman and Dr. M'Intosh) : 

 5-8 miles west of Great Skellig, 70-80 fathoms ; 38 miles west, ^ south 

 of Dursey Head, 108 fathoms ; Glandore Harbour (Roy. Irish Acad.) 



Sub-order II.— CYCLOSTOMATA, Busk. 

 Family. — Ckisiid^, 



The British species of this family have lately been revised by 

 Mr. S. F. Harmer in the Quart. Jour. Micros. Sc, March, 1891. 

 He bases his identification principally on the form and position of the 

 ovicell, this being, in his opinion, the most characteristic feature of 

 the colony. From a consideration of this organ he restores Crisia 

 <iculeata, regarded by Busk and Hincks only as a variety of C. ehurnea, 

 to the rank of a distinct species, as it is regarded by Hassall, Johnston, 

 and Smitt. Similarly he restores the C. geniculata of Milne-Edwards, 

 regarded by Busk, Smitt, and Hincks as only a spineless variety of 

 C. cornuta, to specific distinction. 



He makes one new species, C. ramosa, the important distinctions 

 of which are the regular pear-shaped form of the ovicell, and its 

 circular aperture borne on a long and very conspicuous funnel-shaped 

 tube, considerably wider at its summit than at its base. The British 

 species of Crisia are thus increased from the three given by Hincks in 

 the Brit. Mar. Polyz. to double the number, and I have been ^fortunate 

 ■enough to obtain all the forms around Dublin Bay. 



Genus. — Ckisia, Lamouroux (part). 

 1. Crisia cornuta, Linn. 



In this and the next species the zooecia are in only a single series 

 on the segmented zoarium ; while in the other four species they are 

 arranged in two alternating series. In C. cornuta, there is only a 

 single curved zooecium to an internode, with a long- jointed spine 

 springing from the side. The ovicell is described and figured by 

 Harmer, loc. cit. p. 171, pi. xii. fig. 9. There are no zooecia on the 

 internode which bears it, but a lateral branch on each side. The 

 ovicell is very much inflated, with a tubular aperture. 



Irish Localities. — Ireland's Eye (Miss Ball, 1837): Down and 

 Antrim Coasts, and Killery Bay, Connemara ("W. Thompson) : Kil- 

 liney, Dublin Bay (J. E. Duerden) : Bantry Bay (Roy. Irish Acad.). 



