14 EUCRATIID^. 



EucRATEA CHELATA, Linnceus. 



Plate I. fig. 3 ; Plate II. figs. 4-8 ; Plate III. figs. 9-11. 



BaLL's-HORN Coralline, Ellis, Corall. 42, no. 9, pi. xxii. fig. b, B. 



Sertularia chelata, Linn. Syst. (ed. 10) 816. 



Cellularia chelata, PalL Elencli. 77. 



Sertularia loricata, Linn. Syst. (ed. 12) 1316. 



Cellaria chelata, Ellis ^ Sol. Zooph. 25 : Lamk. An. s. Vert. (ed. 2) ii. 189. 



EucR.iTEA chelata, Lttinx. Expos. Meth. 8, pi. Ixv. fig. 10 : Johnston, B. Z. 

 (ed. 2) 288-9, woodcut, fig. 64: Hincks, Ann. N. H. March 

 1853, pi. vi. fig. 3 ; id. Devon Oat., Ann. N. H. ser. 3, ix. 23 : 

 Smitf, Kritisk Forteckn. iii., CEfvers. Vet.-Akad. Forliandl. 

 1867, 281 & 301 : Gosse, Dev. Coast, 132. 



Scruparia chelata, Oken, Lehrb. Naturg. Abth. ii. 90 : Busk, B. M. Cat. i. 

 29, pi. xvii. fig. 2. 



EccRATEA LORICATA, Flem. B. A. 541. 



Unicellaria CHELATA, Blahiv. Actinol. 461, pi. ixxvii. fig. 2. 



Eucratee cornee, M.-Edwards, Ann. Sc. N. ser. 2, ix. Zool. 204, pi. viii . 

 figs. 1,1a. 



Catenaria CHELATA, If Orhiguy, Pal. Fran^. Terr. Cret. v. 43. 



Zoarium often much branched ; zooecia in the form of a 

 horn, narrowed below, enlarging gradually upwards to 

 the base of the aperture, which slants away to the top 

 of the cell ; aperture oval^ surrounded by a thin raised 

 unarmed margin ; frequently a rudimentary cell below 

 it in front. Ooecia mitriform, somewhat pointed 

 above, with a keel down the centre, borne below the 

 aperture on an imperfectly developed cell. Primary/ 

 zooecium small, destitute of the usual peduncular por- 

 tion, and terminating below in a short caudate process; 

 aperture narrow, elongate, occupying the whole of the 

 front ; cell attached by a short, jointed stem, which 

 originates a little below the aperture. 



Var. u. 7'epens. Zocecia decumbent and adnate ; aper- 

 ture scarcely marginate ; branches given off from the 

 sides of the cells. (Plate I. fig. 3.) 



Var. /3. gracilis. Zocecia very slender and elongate, 

 tubular below and enlarged above. 



Range of Variation. In an early stage of growth this 



