72 



Tlie tube is composed of whitish or translucent grains of 

 coarse sand with frafjments of shells and coral bound together 

 by the secretion. Though comparatively thick it is readily 

 broken. 



It is difticult to make out the species described from the Cape 

 by Schmarda,* under the names of Clymene mioocephala, and 

 Clvuii'iic Ixroccpluihi. The former may have lost its head, and 

 the latter might be Xicomachc viewed from the ventral surface 

 with the proboscis partially protruded. 



The wide distribution of this form and its varieties is note- 

 worthy, for it frequents both shores of the Atlantic, that is 

 Europe and Africa on the one hand, and America on the other. 



NicOMACHE McIntoshii, Maren/.eller, 1889. 



1889. (?) Nicomache McIntoshii, Marenzeller, Zool. Jahrb. III., 

 p. 19, Taf. i., fig. 8. 



A fragment of the posterior end apparently of this form 

 comes from St. James', False Bay, between tide-marks. 



The body ends obliquely in a large ovoid expansion (Plate 

 VI., fig. 33) which is fixed to the dorsal (?) surface, but extends 

 elsewhere all round as a broad rim, with a slight notch in the 

 mid-ventral line. The anus forms a prominent cone with 13 

 crenations on the margin and situated slightly nearer the ventral 

 than the dorsal edge. A considerable area posterior to the 

 vent is dotted with low flat papilUv like variola?. 



After the bristle-papilla and row of hooks on each side the 

 last segment narrows to the segment-junction. The segment 

 in front is short, with a peculiar dorsal flap or process which 

 is somewhat shield-shaped — the median curve posteriorly being 

 close to the segment-junction, though elevated above it, and 

 a lateral curve on each side running forward to the bristle- 

 papilla — which is nearly in the centre of the short segment. 



The segment in front is also short, and has a similar modified 

 dorsal shield with a central prominent edge just behind the 

 bristle-papilhv ; and a similar, though less distinct shield occurs 

 on the third from the end. 



The fourth bristle tuft from the posterior end shows rather 

 stout but finely tapered winged bristles. 



The hooks (which are probably posterior) have a broad and 

 strong head with a powerful chief fang, and four prominent sharp 

 processes with the points directed forward above it, but of course 

 other hooks are present in the crown, these being apparent 

 distally in lateral view (Plate VI., fig. 34). A filament passes 



* Op. cit., p. 15, Taf. XIX., tigs. 163 and 164. 



