176 ZOOPHYTOLOGY. 



S. clavata, Hincks, ii. sp. Plate XVII, figs. 5, 6, 7, 8. 

 Cell slender, elongate, enlarged upwards, tapering off below ; aperture 

 subterminal, oval ; branches given off from the back of a cell ; ovicelligerous 

 cells placed back to back with the ordinary cells. 



Polyzoary sparingly branched, the branches originating 

 from the back of a cell ; cells ovate-elongate above, and 

 tapering off below, each one springing from behind the 

 aperture of another, and attached to it by a somewhat cor- 

 date expansion of the base; aperture oval, small as com- 

 pared with that of 8. chelata, and not marginated. The 

 position of the ovicelligerous cells is very peculiar. They 

 are (generally) attached to the back of the ordinary cells, to 

 which they are adherent throughout, and are irregularly dis- 

 tributed over the polyzoary. Occasionally they occur at the 

 side. They are inferior in size to the ordinary cells. The 

 ovicell is of the usual form. 



The polypide has, I believe, about ten arms. 



Dredged off Filey, on the Yorkshire coast, parasitical on 

 Crisidia cornuta ; not uncommon. Lamlash Bay, Arran. 



Sub-order. Cteiiosiomata. 

 Fam. Alcyonidiadce. 



Sir John Dalyell, in his work on * Rare and Remarkable 

 Animals of Scotland,' has described and figured an Alcyoni- 

 diwn under the name of A. My till. The species has escaped 

 the notice of Dr. Johnston, and is not included in the ' His- 

 tory of the British Zoophytes.' Sir J. Dalyell's description 

 displays his accustomed accuracy, so far as it goes, but he 

 did not observe the ovaries, and his account of the species is 

 therefore necessarily incomplete. The name which he has 

 assigned it is altogether inappropriate, and conveys a false 

 impression, inasmuch as the species is by no means a para- 

 site of the Mussel exclusively, but is found encrusting Fuci, 

 stones, and shells of various kinds. It is manifestly unde- 

 sirable that such names should be retained, and I therefore 

 propose to change it. I do this Avith the less hesitation, 

 Ijecause the species has thus far attracted very little atten- 

 tion, and Sir John Dalyell's name for it has not obtained a 

 footing in our nomenclature. 



Alcyo7iid'mm hexagomtm, Hincks. {A. Mytili, Dalyell, ' Rare and Re- 

 markable Animals,' vol. ii, p. 36.) 



Encrusting, fleshy, of a dingy-white colour, composed of hexagonal cells, 

 the septa of which show distinctly on the surface, and thickly covered with 

 small obtuse prominences. 



