722 



DE. W. C. m'iNTOSH on A 



fragments show nine or ten buds, yet they are evidently far from 

 being complete. The absence of a head leaves great uncertainty 

 on the latter point ; and if it existed at all, it could only 

 have been in the siliceous stem of the sponge, which had been 

 torn oft'. 



Two female buds were found. One of these is still attached 

 by its pedicle of four segments to the parent-stock. These inter- 

 mediate segments somewhat resemble those of ordinary buds, 

 only they are more slender. All have rudimentary lateral cirri 

 and setigerous processes. The diverticulum of the alimentary 

 canal proceeds from the main trunk in the ordinary way, passes 

 through the anterior segments of the bud, and becomes lost in the 

 ojmcity caused by the ova. The head of the bud is bilobate, and 

 furnished dorsally with a large reddish-brown eye on each side, 

 and a still larger pair, of similar shape (somewhat circular) and 

 colour, on the ventral surface. These eyes, w^hile useful for both 

 dorsal and ventral vision, approach so near the margins that they 

 are also available for lateral sight. The head terminates laterally 

 in two short cirri and a setigerous process furnished w^ith a spine. 



The body of the female bud is somewhat fusiform, gradually 

 increasing in diameter till full bread this attained, and, after 

 a nearly cylindrical region, diminishing towards the tail, though 

 to a less degree than anteriorly. The entire body, from the 

 middle of the second segment backward, as well as the bases of 

 the feet, is filled with ova, which show germinal vesicle and spot. 

 The anterior segments are provided with bristles of the same 

 type as the parent-stock, only the terminal appendage is more 

 differentiated. None of the long simple bristles are apparent 

 in this fragmentary example. 



Exactly opposite the point from which the pedicle of the fore- 

 going bud sprang is another small one, consisting of upward of a 

 dozen segments. Moreover, in the same specimen, a pair of 

 young buds occur opposite each other. In these cases the seg- 

 ment of the intestine of the parent-stock, from which the diver- 

 ticulum proceeds, is shorter than the rest. It would seem that 

 the bud arises opposite a foot, and there is no evidence that it 

 ever springs between two (successive) feet. The shortening of the 

 intestinal segment may be due to the appropriation of the sub- 

 stance of both it and the body-wall in the production of the new 

 bud. 



A free female bud, again, occurred in one of the basal canals of 



