60 ANTHOZOA IIYDROIDA. 



and kindly sent to me, were examples of this species. Adherent to 

 oysters dredged at Killough, co. Down." W. Thompson. 



Polypidom If inch high, irregularly branched, the branches alter- 

 nate, spreading, the principal composed of many parallel tubes, the 

 ultimate of a single tube, with a joint between each cell, which is 

 small, articulated, cylindrical or somewhat dilated at the aperture. 

 Vesicles numerous, scattered or imperfectly clustered, large and 

 shaped somewhat like the flower of a Calceolaria, with a short tubu- 

 lous aperture in the middle of its concavity, which is on the superior 

 and inner aspect. 



I have named this curious and very interesting species after its 

 discoverer, to whose kindness I am indebted for the specimen that 

 furnished our figure and description. In habit and structure it 

 closely resembles H. halecinum ; from which it is, however, at once 

 distinguished by its remarkable ovaries. 



8. H. MURicATUM, vesicles roundish or ovate., echinated. Dr. 

 David Skene. 



Plate IX. Fig. 8, 4. 



Sertularia muricata, Ellis and Soland. Zooph. 59, pi. 7, fig- 3, 4. Esper Pflanz. Sert. 

 tab. 31, f5g. 1, 2. Don's PI. and Anim. of Forfar, 36. Tuii. Brit. Faun. 215. 

 Jaineson in Wern. Mem. i. 564. Flem. Brit. Anini. 543. IIog</s Stockton, 34. 

 — Laomedea muricata, Lamour. Cor. Flex. 209. — Campanularia muricata, Blainv. 

 Actinol. 473. — Thoa muricata. Couch Zooph. Com. 5. Corn. Faun. iii. 16. il/ac- 

 ijillivray in Ann. and Mag. N. Hist. ix. 463. 



Hah. — On old shells in deep water. The sea at Aberdeen, Skene. 

 Angusshire, Mr. Don. Frith of Forth, Jameson. Seaton, J. Hogg. 

 Near Scarborough, W. Bean. Near Dundee, TF.t/ac^-so«,yzm. Coast 

 of Cornwall, rare. Couch. Giant's Causeway, A. H. Hassall. 



Polypidom from 2 to 4 inches high, rooted by a fibrous entangled 

 mass, irregularly branched, stout and rigid, yellowish-brown ; the 

 stem and branches composed of capillary tortuous tubes closely 

 agglutinated, but the extremities of some of them become free and 

 appear like simple fibres ; branches erecto-patent, slightly tapered at 

 the point. Cells visible only on the simple fibres, small, alternate, 

 separated by an oblique joint, sessile, campanulate, with an entire 

 even aperture. Vesicles very numerous and often crowded, shortly 

 stalked, roundish or ovate, somewhat compressed, and rough with 

 prickles arranged in lines on elevated stria) : when filled with ova, 

 the centre is of a deep chesnut-brown colour. 



