FLORIDAN BRYOZOA. 17 



formed, with the granulation usually arranged in longitudinal rows, occupies about the 

 third part of the primary area, restraining it to the secondary area, that is almost en- 

 tirely protected b}* the fornix. To judge from the figures of Caberea arachnoides, with 

 its »transparent granulations» (Busk, 1. c), the same mode of calcination seems to be- 

 long to that form. Then only the presence or absence of secondary organs of the co- 

 lony would distinguish it from Caberea retiformis. Now, as these organs can fail even 

 in the same coloiry, we have, of course, to regard the Floridan form as a local variety 

 of the same specific type as the Australian Caberea arachnoides, but for its geograph- 

 ical import, it may well be designated by its own naine. For both forms the mode of 

 articulation of the stem is the same as that described above on the Cellularia cervicornis. 



Caberea retiformis was taken by Pourtales at the depths of 68 and 270 fathoms. 



The agreement between the Australian and the Floridan Caberea gains greater im- 

 portance, when we find it the case with a species of the family 



BICELLARIE.E. 

 This family, we know, comes very near to the Cellulariese '). and, indeed, the 



Halophila Johnstonice "') (Pl. V, tig. 47), 



which was at first described as inhabiting the Bass-Strait. truly holds a mean position 

 between Cellularia and Bicellaria, so that it may seem difficult to decide, whether it 

 ought to be reekoned to the one or the other of these families. Such an ambiguity 

 we encounter very often, when the secondary organs are wanting. 



Of this species, among the Floridan collections, I find a little fragmentary speci- 

 men, with only a few recognizable zooecia (see fig. 47) but good enough for the iden- 

 tification with the Australian form, that is well known by the excellent figures and the 

 short description given by Busk. The only differences, that are to be seen, are the 

 loss of the angular spine at the upper-outer angle and the more marked rib along the 

 margins of the proximal parts of the zooecia, in the Floridan form. But incomplete, 

 as is the Floridan speciraen, it retains a very obvious mark of the spine; and even in 

 the Australian form, in the below-cited figures, we see an indication of the rib. To 

 judge from the figures of the Australian form, the size of the zooecia seems to be the 

 same with that of our Floridan form, viz. the length of the apertural area about 

 0,:> in. in. 



In my former papers 3 ), on the genus Bugula, I have discussed the significance 

 of the characters, by which the species should be distinguished. By the form of the 

 zocecia as well as of the avicularia, in the old species Bugula avicularia, Ave must ga- 

 ther together a whole group of hitherto assumed species, although the typical forms 

 of the varieties will be very easy to distinguish. The only point, which can still be 



1 ) Öfvers. Vet.-Akad. Förh. 1867, p. 32<J etc. 



2 ) Grav, vide Busk Cat. Polyz. Brit. Mus., p. 43. tab. XXX. 



3 ) Öfvers. Vet.-Akad. Förh. 1867, pag. 339 etc. 



K. V. t. Akad. Handl B. 10. N:o 11. 



