ON BUDDING IN POLYZOA. 531 



phagus, and the later development of the bud may be passed 

 over. 



Fig. 3. — Diagram to illustrate the probable relations of the lophophore aud 

 stomach in a Loxosoma bud. The upper iavagiuation is the lophophore 

 cavity, the lower is the foot-gland, the compressed body within the bud 

 is the stomach. 



XJljaniu (3) describes the development of the bud in Pedi- 

 cellina. A protuberance of the cuticle contains some round 

 clear cells ; the outer soon arrange themselves as an epithe- 

 lium, and a constriction divides off the bud from the stem ; 

 meanwhile two cavities appear in the central parenchyma; the 

 lower and larger one he rightly regards as the stomach, the 

 upper one he calls the " brood pouch/' whereas it really is the 

 lophophore cavity, the lumen of which is at first quite distinct 

 from that of the stomach. There is nothing of further interest 

 to us in his paper. 



Prof. Salensky (9) has also studied the development of the 

 bud in Pedicellina echinata, on p. 32 he says, "At the 

 summit of the bud, several of the ectodermal cells elongate and 

 sink within; probably these cells give rise to the endoderm." 

 The further development of the bud follows almost precisely 

 the same course as that which he gives for Loxosoma. As we 

 shall immediately see, Hatschek gives a different rendering of 

 the phenomenon, and I would point out that Salensky's figure 

 of his earliest stage (Salensky pi. xiv, fig. 26) would very 

 well bear the former's interpretation. 



The fullest account of the budding Pedicellina is in the 

 very careful researches of Hatschek (8), in whicli he shows 

 that at the growing point of the stolon there is a single-layered 

 tubular mass of cells lying close beneath the external epitheliuu). 



