1906.] TUEBELLARIA OF THE CAPE VEEDE ISLANDS. 713 



The structure of the penes and other organs of the body, such 

 as the musculature, shows a complete agreement with that found 

 by Lang in his specimens. A difference is, however, to be met 

 with in the case of the epidermal structures. 



Lang has described nematocysts or needle-like bodies of four 

 types, grouped in batteries, occiu-ring in the dorsal epithelium. 



In a young specimen which I have examined I could find no 

 structures of this type. In sections of the more mature specimen 

 referred to above are spindle-shaped bodies, each of which has 

 discharged a thread from its outer end, lying in batteries on the 

 dorsal surface (PI. LII. fig. 3,/). These are perhaps to be referred 

 to Lang's fourth type ("Freie nadeln, an welchen ein Faden spiralig 

 aufgerollt ist "). Both the spindle and the thread discharged from it 

 are deeply stained. A nuraber of undischarged needle- or spindle- 

 shaped bodies occur in the parenchyma, but I have not been able 

 to see any spiral thread inside these. These are the only nematocyst- 

 like oi-gans that I have been able to find in my specimens. As, 

 however, they agree very closely in all other respects with the type 

 of A. virilis, I have not ventured to give them a distinct name. 



PsEUDOCERIDiE. 



Thysanozoon brocchii (Risso) var. cruciatum ? 



Thysanozoon brocchii Lang [1884] pp. 525-536, Taf. vi. figs. 3, 4 ; 

 von Stvimmer-Traunfels [1895] p. 161. 



Several specimens, " from under stones at low tide at St. Vincent 

 and at Porto Praya." (1. W. 7.) 



' ' Drab-yellow with dark grey markings. There may be veiy little 

 yellow and the genei-al colour becomes a dark grey. Generally, 

 but not in all the specimens, there is a narrow longitudinal white 

 stripe and a, broader transverse one at about -^ of the length of the 

 body from the anterior end." 



The specimens vary in size from about 8 to 16 mm. 



EuRYLEPTIDiE. 



Oycloporus papillosus Lang. 



Cycloporus papillosus Lang [1884] pp. 568-571, Taf. vi. figs. 1, 2, 

 Taf. viii. fig. 5. 



Under stones at low tide, Porto Praya. (11.) 



Small, rather rectangular in shape ; margin colourless, nearly 

 transparent. The hinder edge of the body is carried folded into a 

 bag dorsally. 



This specimen is without papillse, and in all probability is to be 

 referred to Lang's var. Icevigaius. 



Hallez has described a second species of the genus. 



The examination of a large sei^ies of specimens referable to this 

 genus from the various localities in which it occurs would in all 

 probability reveal the existence of several recognisable races. 



