6 CLAVID^E. 



brown (?) colour, with about 20 white, tapering ten- 

 tacula, borne on an adherent crust, composed of chitinous 

 tubes cemented together into a solid plate ; GONOPHORES 

 in rather small bunches, forming a somewhat narrow 

 ring round the body. 



C. CORNEA is a smaller and slighter species than the 

 preceding. The polypites are more delicately formed and 

 want the broad expansion towards the upper part of the 

 body; they taper gradually, and not very markedly, 

 downwards. I can only speak doubtfully of the colour, 

 as I have not examined living specimens; but I should 

 judge it to be a reddish brown. The clusters appear much 

 less dense and massive than those of C. squamata. This is 

 due not only to the fact that the polypites are less closely 

 packed together, but also to the inferior size of the belt of 

 reproductive buds, which is enormous in C. squamata, and 

 of very moderate dimensions in the present species. I 

 have not noticed the lineated appearance in the polypites 

 of C. cornea. The crust is a solid chitinous plate, of a 

 decided horn-colour, made up of many tubes intertwisted 

 or laid side by side, and cemented together. The tubes 

 are larger and made of much firmer material than those of 

 C. squamata. 



The two species, though allied, differ Avidely in general 

 aspect, as well as in the details that have been referred to. 



Hob. The Orkneys, on Fucus (Goodsir) : Scotland, on 

 seaweed (Prof. Wyville Thomson) . 



4. C. LEPTOSTYLA, Agassiz. 



Contributions to the Nat. Hist, of the U. S. iv. 218, pi. xxi. and fig. 32, p. 222. 



Plate II. fig. 1. 

 POLYPITES set closely together, forming moss-like bunches 



