244 SCALPELLUM ORNATUM, 



2. SCALPELLUM ORNATUM. PI. VI, fig 1. 



Thaliella ornata. /. K Gray. Proc. Zoolog. Soc, 1848, p. 44, 

 Annulosa, Plate. 



S. (Fcem.) valvis 14, mb-rufis: lateribus superioribus 

 quadranti-formibus, arcu crend profunda, notato. 



(Fern.) Capitulum with 14 reddish valves : upper latera 

 quadrant-shaped, with the arched side deeply notched. 



Mandibles with three teeth ; maxillae narrow, bearing 

 only four or five pair of spines. 



Males, two, lodged in cavities on the under sides of 

 the scuta ; pouch-form eel, with four unequal, rudimentary 

 valves : no mouth : cirri not prehensile. 



Algoa Bay, South Africa. Attached to Sertularia and Plumularia. British 

 Museum.* 



FEMALE. 



Capitulum oblong, with the upper portion much pro- 

 duced ; valves, 14, thick, naked, closely locked together, 

 irregularly clouded with pale crimson ; the membrane 

 connecting the valves is not furnished with spines. On 

 most of the valves there are furrows and ridges diverging 

 from the umbones, and the lines of growth are plainly 

 marked : in the valves of the lower whorl, the umbones 

 are slightly protuberant. 



Scuta, convex, unusually thick, oblong, quadrilateral, 

 with the occludent margin the longest; lateral margin 

 slightly hollowed out. The umbo (and primordial valve) 

 is situated at the uppermost point of the valve, and con- 

 sequently the growth is exclusively downwards. On the 

 under side (PL VI, figs. 1 b' and lc'), in about the middle 

 of the valve, there is a pit (a) for the adductor scutorum 

 muscle, the depth and distinctness of which varies a little ; 



* I am greatly indebted to Mr. Bowerbank for specimens of this extremely 

 interesting species ; also to Mr. Morris, to whom Mr. Bowerbank had given 

 some of the original specimens. 



