274 MH. A. W. WATERS ON THE 



In OnycJiocella angulosa a diitinous ring surrounds the eud of 

 the " peculiar body," and there is something of the same kind in 

 Scliizoporella unicornis, this part protruding as a double tube. 

 The avicularia of OnycJiocella angulosa and Scliizoporella linearis 

 are the largest I have examined, and in neither case is there a 

 trace of a double gland. Scliizoporella linearis has a large 

 avicularian chamber on the front of the zooeeium, but the 

 cellular body is very small. This raised structure was thought 

 by Hincks* to be an ovicell ; but in my paper on the use of the 

 mandibles I figured a mandible f, and have since been able 

 to cut sections showing that the chamber contains nothing 

 except the cellular body and the powerful muscles, which, from 

 the shape of the chamber, are of course above the operculum. 

 Dried specimens have also shown that the chamber could only be 

 avicularian, and that the wall separating the avicularium from 

 the zooeeium is perforated. 



SUBOEAL G-LANDS. 



Grlands have been mentioned by Ostroumoff, and E-epiachoff 

 speaks in ' Zur JN^aturgeschichte d. Chil. Seebryozoens,' p. 148, of 

 two " blasenformigen Grebilde " at each side of the operculum in 

 Lepralia Pallasiana. JuUien J, since my Supplementary ' Chal- 

 lenger ' Eeport was written, has described, as a testis, an organ on 

 one side of Microporella violacea. According to Jullien this is 

 not paired, but it has much the character of the paired organs. 

 In my sections of Microporella violacea I find nothing of the kind, 

 but it is only right to say that the material I had available was 

 not very satisfactory. 



I liave them in Scliizoporella sanguinea from Trieste and Naples 

 occurring at any rate in the autumn and in mid-winter. In the 

 Naples specimens I did not at first see any attachment of the 

 lower end of the gland, but have since found it in some cases ; and 

 in some specimens from Trieste this attachment to the walls of 

 tlie zooeeium by means of parenchym-threads is more distinct. 

 As there are similar threads from the end of the avicularian 

 gland in Hetepora cellulosa, this is of considerable interest. 



* Brit. Mar. Polyzoa, p. 25]. 



t Journ. E. Mic. Soc. ser. 2, vol. v. p. 6, pi. xiv. fig. 8. 



\ "Du Testicle ebez l&LepraliaJiffularis," Mem. Soc. Zool. de France, vol. i. 

 p. 270, pi. X. (1889). 



