54 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.76 



We have reviewed the specimens collected in the Atlantic region. 

 With the asj^ect of tlie figure of TuhuUpora Ullacea Harmer, 1898, 

 it shows the small micrometric measurements of the Mediterranean 

 species. It is not at all the Atlantic species dredged in the more 

 northern regions. 



Histovical. — Harmer, 1898 (p. 96), Avas the first to separate Ohelia 

 fubulifera Lm)ho%uroux, 1821, from the long synonymy erroneously 

 given by Smitt in 1867 and by Miss Jelly in 1889, but he believed 

 it identical Avith his TubuUpora plialangea^ which in our opinion is 

 incorrect, as the oeciostomes are totally different. 



The older authors made no use of micrometric measurements, and 

 as a result they made a large number of erroneous determinations 

 which are often very difficult to correct when one can not see the 

 figured specimens. All the specialists now know that perfectly dis- 

 tinct species of bryozoa can have absolutely identical zoarial aspects. 



Biology. — Tuljulipora tubulifera Lamouroux, 1821, lives princi- 

 pally on algae and is therefore a floating species. It is quite j^rolific 

 and its small colonies are often very numerous on the same sub- 

 stratum. When the latter is dead they persist because of their cal- 

 careous nature as free forms, but they soon die. The bathymetric 

 indications furnished by the specimens dredged dead have no value. 



Occun^ence. — Alascio and Porto d'Anzio, Italy. 



TUBULIPORA, species 



Plate 14, Fiaure 5 



The small specimen figured incrusts a shell. Its oeciostome is 

 identical with that of the first species we have noted here. The 

 micrometric measurements are also very close, but the fascicles are 

 rare and bear only two tubes. The colony is not flabellate. 



We can not be certain that thesQ small colonies are completely 

 developed. Moreover, in this important genus, in which the species 

 are quite variable, we have not yet an absolute criterion for the 

 limitation of the species. 



TUBULIPORA LILIACEA Harmer, 1898 

 Plate 18, Figiu-e.s 1-10 



1898. TubuUpora Uliacea Hakmer, On the development of TubuUpora, Quarterly 



Journal Microscopical Science, vol. 41, p. 90, pi. 8, figs. 7-9 (Trondjhem, 



Liverpool, St. Andrews Bay, on hydroids). 

 1903. TubuUpora UUacea Nordga^vrd, Die Bryozoen, des westlichen Norwegens 



Meeresfauna von Bergen, p. 99 (Hjeltef jord, 6-20 meters ; Skjaergaard, 



30-40 meters). 



