IN COUCH'S ZOOPHYTES OF CORNWALL. 165 



Genus, Eucratea, — Lamouroux. 



EucRATEA Chelata. — LinucBUs. Brit. M. Poly., Hinchs, p. 14, 

 plate i, fig. 3 ; plate ii, figs. 4 and 8 ; plate iii, figs. 9 and 11. 



Crista Chelata. — Couch, Corn. Faun., plate 98, plate xviii, 

 fig. 1. 



Var. a, repens. Var. (3, gracilis. 



Common and widely spread. St. Ives, off the Deadman, &c. 

 (T.H.) Gorran Haven, Mevagissey, Eowey, &c. (C.W.P.) 



Genus, Scrupocellaria — Van Beneden. 



ScRiTPOCELLARiA SoRiTPosA. — LinncBUs. Couch, Cat. Zoo. of 

 Corn., p. 126; Hincks, Cat. Zoo. Corn, and Dev. p. 33. 



I insert this to call attention to the discovery on the 10th 

 June, 1876, of "curious hooks" on the radical tubes, by which 

 this species moors itself to sponges ; when on harder substances 

 — such as stones shells, &c. — instead of hooks, spreading bird- 

 foot-like rootlets or discs are used. These booklets had been 

 previously noticed by Busk on a Scrupocellaria from Bass's Straits, 

 see British Museum Catalogue of Polyzoa, part i, plate xxv, 

 fig. 3, Couch mentions in his Cornish Fauna, at page 127, and 

 figures it in plate 23, fig. 3, "that at the joints where they come 

 into contact with the substance on which the polypidom grows, 

 a few slender tendrils arise with hooks by which the animal is 

 firmly rooted," and here he stops. These hooks are only useful 

 when uiserted in sponges. Couch's observation relates to the next 

 species only. Ellis, in his Essay on the Corallines on the 

 Coasts of Great Britain and Ireland, 1755, noticed these hooks, 

 at page 38, in Cellaria Eeptans, and figured them in plate xx, 

 fig. B, at F. 



Plentiful in CornwaU. (C.W.P.) 



Scrupocellaria Reptans. — Pallas. 



This has also similar hooks when attached to sponges. I found 

 them lately in a specimen collected in Cornwall, more than 

 thirty years ago, and have also detected them in specimens from 

 the Firth of Forth, where they are not rare. (C.W.P.) 



It is not rare in Cornwall. 

 L 



