— 18 — 



or less circular or occasionali} elongated eavities in the mesogloea, 

 dose to the ectodermal surface (Fig. 5). 



The mesenteries possessed a well developed basai canal. In one 

 of the smaller polyps from the second colony they were forty-eight 

 in number, and in an individuai from the first colony they numbered 

 fift,y-six; this latter polyp, however, presented the peculiaritty of pos- 

 sessing a pair of ìnicronemes on either side of the microdirectives, 

 the arrangement of the remaining mesenteries being normal. It will 

 probably be fairly accurate to say that the number of the mesente- 

 ries is from lbrty-eight to fifty-two, numbers which agree with that, 

 fifty, given by Duchassaing and Michelotti, 



Z. Anduzii has not been described from specimens since it was 

 discovered by Duchassaing and Michelotti. In its structural charac- 

 teristics it resembles very closely Z. Solanderi, indeed its only marked 

 differences from that species seem to be its more columnar forni, the 

 greater number of the sub-ectodermal eavities, and the fact that the 

 polyps arise in groups from a membranous coeneuchyme. Two of these 

 peculiarities, however, seem to beof little value, since the polyps of the 

 forni which Duerden (1808) apparently correctly identìfìes as Z. Solan- 

 deri, are very similar in shape to Anduzii and furtherpresent the sub- 

 ectodermal eavities in equal abundance. The only marked dififórence, 

 then, between the two species is in the nature of the coenenchyme, 

 and whether this can be regarded as of specific value can only be 

 determined by further observation. Since it is a Constant dill'erence 

 so far as our present information goes, it seems advisable to retain 

 Anduzii as a distinct species, but I ani inclined to believe that the 

 study of more abundant material will demonstrate its identity with 

 Solanderi. 



Zoanthus dubius Lsr. 



A colony of about ten polyps, labelled Zoanthus dubius by both 

 Duchassaing and Michelotti, was seated upon a fragment of Mycedium. 

 The polyps arose from a fiat expansion of coenenchyme and were al- 

 most cylindrical in shape, measuring from 0.5 up to 1 cm. in height, 

 with a diameter a little below the summit of 0.6-07 cm. 



The column wall was rather thin, so that the polyps had a some- 

 what translucent appearance. The two portions of the doublé sphincter 

 (Fig. 6) were qui te separate; the distai portion was relatively large, 

 many of its eavities traversing almost the whole thickness of the me- 

 sogloea, while the proximal portion was mudi narrower, but quite 

 long, its eavities being comparatively small and continued a consi- 

 derale distance down the column. Between the lower portion of the 

 sphincter and the endodermal surface of the mesogloea there were a 

 number of elongated eavities, which recali the encircling sinus de- 



