4 02 DISCOVERY REPORTS 



5. Cornucopina lata (Kluge). 



Bicellaria lata Kluge, 1914^. 639, pi. xxxiii, fig. 1. 

 Cornucopina lata Harmer, 1926, p. 422. 

 Station distribution. Not represented in the Discovery collections. 

 Geographical distribution. Wilhelm II Land (Kluge); Oates Land (Terra Nova). 

 In the Terra Nova material the broad tubular part of the projecting portion of the 

 zooecium, between the main axis of the branch and the proximal border of the opesia, 

 is usually longer than in Kluge's figure. In all other respects the agreement is very 

 exact. The material is fragmentary. 



6. Cornucopina ovalis sp.n. Plate VII, fig. 2; Fig. 29 A-C. 

 Station distribution. Antarctic: Weddell Quadrant, St. 160. 

 Geographical distribution. Shag Rocks (Discovery). 

 Holotype. St. 160. 



Description. Zoariwn bushy (type colony 7-5 x 7 cm.) composed of delicate branches 

 whose rootlets form a short thick stalk to the colony (Plate VII, fig. 2). 



Zooecia without digitiform process, tubular part long, expanded part turned almost 

 at right angles to the main axis (Fig. 29 A). 



Opesia long, oval. Orifice at end of opesia farthest from middle of branch, oblique, 

 being a little to outer side of long axis of the opesia. Other end of opesia occupied by a 

 cryptocyst with irregular, more or less straight, edge. 



Spines. Usually two on a common eminence at outer corner of zooecium, and a third 

 close to them. Usually another spine near the middle of the branch and sometimes one 

 in the intervening space making five in all. 



Basal avicularia on many zooecia, originating near main axis of branch with mandible 

 directed towards axis (Fig. 29 A, B), attached rigidly by fairly narrow base and widening 

 relatively suddenly, but without any clear distinction of head and stalk, palatal surface 

 oblique. 



Frontal avicularia similar, less expanded distally (Fig. 29 C), mandible directed 

 frontally, commonly present on fertile zooecia, rarely (if ever 1 ) present elsewhere. 



Fertile zooecia with four spines as in other zooecia, but with shorter, broader opesia 

 (Fig. 29 A). 



Ovicell large, longer than wide, with radially striated entooecium, connexion with 

 distal zooecium as in other species of the genus. 



Remarks. This species resembles Cornucopina grandis (Busk, 18526, p. 42) in the 



shape of its opesia and the possession of a cryptocyst, but all parts of the zooecia are 



more elongated. The basal avicularia are smaller, and, in the typical form but not in var. 



versa, face in a direction at right angles to those of C. grandis and have a more oblique 



palatal surface. In the typical form their outline follows the curvature of the main axis 



of the branch so that they appear neatly fitted into the angle between the projecting part 



of the zooecium and the main axis. 



1 Two fragments of a Cornucopina from the type-locality have frontal avicularia on non-fertile zooecia, but 

 in the absence of basal avicularia and ovicells their identity is uncertain. 



