On a remarkable Hydroid Polype. 309 



two sharp denticles at the tip, and the inner edge of the 

 curved part minutely serrulated. Spines yellow, tapered in- 

 sensibly to a rather obtuse point, one to each brush of bristles. 

 Tentacular cirri awl-shaped, abruptly acuminate, downy or 

 ciliate, of a dusky or dark colour, with paler spots, reaching 

 to or a little beyond the apex of the foot ; all the feet posterior 

 to the 31st pair are furnished with these cirri, but only those 

 anterior to them which are destitute of scales. Tail without 

 elongated styles. 



It is difficult to describe the colouring of this fine worm. 

 Of specimens preserved in spirits the ground colour is a 

 straw or ochre-yellow, but the back is clouded and spotted 

 with dusky olive-green, there being a row of spots down the 

 middle, a line or band along each side, and another row of 

 spots exterior to this above the bases of the feet ; and these 

 markings correspond with the arrangement of the tubercles 

 which roughen this surface. The number of segments is 

 liable to vary. Audouin and Edwards say that there are 82 

 of them. In one specimen we found them to be about 80 ; 

 but that which served for our figure, and which was twice the 

 length of the other, had not less than 110. 



Plate V. Fig. 1. P. scolopendri?ia of the natural size. 2. The head 

 with its appendages, highly magnified ; the front scales have been removed. 

 3. The proboscis laid open. 4. Section of a segment, showing the squa- 

 mous feet; the scales have been raised and reverted. 5. A scale. 6. One 

 of the cirrigerous feet. 7. A bristle of the dorsal brush. 8. The upper 

 bristle of the ventral brush. 9. One of its under bristles. 



6. Sigalion Boa, Johns. — Strangford Lough, Messrs. 

 Hyndman and Thompson. 



[To be continued.] 



XXXVII. — On the Corymorpha nutans of Sars, a remarkable 

 Hydroid Polype. By Edward Forbes, Esq., and John 

 Goodsir, Esq. 



At the Birmingham Meeting of the British Association we 

 gave a short account of a remarkable Hydroid Zoophyte, new 

 to the British seas, which, supposing it to be altogether new, 

 generically and specifically, we proposed to name Ellisia Jlos 



