igii.] N. Annandale : Ctenostomatous Polyzoa. 195 



The anatomy of the two genera is very similar, but the whole ali- 

 mentary canal (pi. xiii, fig. 2a) is more slender and elongate in 

 Pottsiella, which has only 8 tentacles. 



Pottsiella ereda (Potts). 

 (PI. xiii, figs. 2, 2a.) 



Syn. Paludicella erecta^ Potts. 



The zooecia are slender, elongate and somewhat constricted 

 both at the base and at the tip. The orifice is pentagonal in cross- 

 section. The basal tubules are often of considerable length ; occa- 

 sionally extra tubules are produced from the sides of the zooecium, 

 but this is exceptional. Buds may, perhaps, be borne sometimes 

 at the end of these adventitious lateral tubules. 



This species is only known from the neighbourhood of Phila- 

 delphia, U.S.A. I have been enabled by the kindness of Mr. C. 

 Rousselet to examine specimens from the type locality. 



Genus Victoreli^a, Kent. 



The adult zooecia are always nearly vertical but as a rule 

 they pass through a stage at which they resemble those of Paludi- 

 cella in form. They are separated by basal tubules resembling 

 those of Pottsiella, and daughter-zooecia (distal buds), (with or 

 without similar tubules intervening, are usually borne near the 

 tip of the zooecium (pi. xiii, fig. 3) in addition to the basal buds. 



The cardia closes off from the oesophagus proper an oval 

 chamber lined with a thin chitinous coat and surrounded at its 

 base by a stout compressor muscle. This muscle (pi. xiii, figs. 

 7, 8) serves to close off the chamber from the cardiac part of the 

 stomach, which is produced upwards to meet it in tubular form. 

 The arrangement of cilia in the alimentary canal is the same as 

 that found in Paludicella. There is only one funiculus, attached 

 to the base of the stomach, and the gonads are borne on the zooe- 

 cial wall far from it. There are 8 tentacles. 



Four "species" can be distinguished in this genus, but they 

 are so closely allied that it might be better to regard them merely 

 either as varieties or as subspecies (local races). They may be 

 separated as follows : — 



1. Parietal muscles present at the tip of the 



zooecium (pi. xiii, fig. 4). Young zooe- 

 cium circular in cross-section at the tip, 

 adult zooecium quadrate ; distal buds 

 only produced by adult zooecia ; lateral 

 basal buds rarely suppressed . . V. nmlleri. 



2. Parietal muscles absent from the tip of 



the zooecium (pi. xiii, fig. 5). 

 I. Both young and adult zooecia quad- 

 rate at the tip ; basal tubules 



