8 MB. A. W. WATEES ON" BEYOZOA FEOM EAPALLO 



had previously been overlooked, as they are very minute, and 

 being on the inner side of the ovicell are in most positions of the 

 zoarium concealed ; however, when looked for, they can generally 

 be found upon Mediterranean specimens. 



The shape of the vibracular chamber and of the chamber for 

 the insertion of the rooting-fibre is the same in S. scrupea and 

 scruposa, and these species are closely allied. It may be men- 

 tioned that, while the presence of the scutum is a distinguishing 

 character, it does not occur in all the zooecia. 



SCETJPOCELLAEIA INEEMIS, NormaU. (PI. 1. figS. 11 & 12.) 



Scrupocellaria inermis, Norman, Quart. Journ. Micr. Sc. n. s. vol. viii. 

 p. 215 (4) pi. V. figs. 1-3; Kirchenpauer, Jahresb. Comm. wissensch. 

 IJnters. d. deutschen Meere, Jahrg. ii. & iii., 1876, p. IBO. 



A fine stained and decalcified specimen, collected in Trieste, is 



figured, as it shows so well the way in which the articulation is 



formed, for in the zooecium at the bifurcation the polypide is seen 



on both sides of the articulation, proving that this is a break 



formed in mature zooecia. Although the object of the figure is 



to explain this structure, it will be as well to also consider the 



species systematically. This specimen has no median avicularia, 



a,ud the lateral one is much smaller thau in Normau's figures. 



There are no spines and no scutum ; whereas, as I have showu *, 



S. elliptica, Eeuss, has both, and therefore the two specific 



names must be retained. The vibracular chamber is small, and 



appears to be narrower than in the specimens described by 



Norman, but being decalcified a complete comparison cannot be 



made. This chamber is much shorter aud wider than that of 



8. scruposa, and the chamber for the insertion of the radical is 



distinctly separated, both chambers being about the same width. 



The vibraculum is very delicate, but I should scarcely call it 



short. At a bifurcation there is only one vibraculum ; thus it is 



distinguished fx'om S. scruposa, in which there are two. Pergens 



says t that S. scruposa form elliptica is found at Palavas (Dept. 



de la Herault) and at Banyuls. Presumably it is this species ; 



but as there has been confusion between 8. elliptica, E-euss, and 



8. inermis, 'Norm., we cannot be certain without a re-examination, 



* " North Italian Eryozoa," Quart. Journ. Geol. See. vol. xlvii. p. 6, pi. i. 

 figs. 16, 17. 



t " Notes sur les Eryozoaires," Ann. Soc. Eoy. Malac. Eelgique, vol. xxiv. p. 7. 



