278 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The near identity of these two species permits us now to fix the 

 biologic conditions of the marine waters (depth, temperature, salinity, 

 etc.), at Wilmington, North Carolina, the Jacksonian locality for the 

 fossil form. 



Biology. — MacGillivray's specimens encrust shells and corals in 

 perfect accord with the nature of the bottom where this species has 

 been collected in the P ilippines. Our specimens were in reproduc- 

 tion February 16, 1908 (38 meters). 



The physiologic function of the distal avicularia is evidently the 

 same as in Lepralia Jeegensis Busk, 1885 but it is very difficult to 

 conceive what it may be. The geographic distribution of this species 

 is very large since it has already been observed in Australia. It is 

 certain that it will be discovered in other localities of the equatorial 

 Pacific. 



Occurrence. — 



D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S., Sh. 

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 



27' 15" E.; 24 fathoms; co. S., Sh. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" E.; 

 57 fathoms; Sh. 

 Geographic distribution. — Nichol Bay, Northwestern Australia. 

 (MacGillivray, 1891.) 

 Holotype.—C&t. No. 8028, U.S.N.M. 



Genus GEPHYROPHORA Busk, 1884 



The apertura bears a proximal rimule. The frontal is a tremocyst. 

 The ovicell is hyperstomial; it opens into the peristomie and is never 

 closed by the operculum. The opercula are dimorphic. 



The operculum in this genus is not provided with lateral bands; 

 it has the schizoporid aspect, that is to say, the proximal border of 

 the posterior is sinuous. Its differences from Galeopsis are of little 

 importance. The transition between the lepralian and schizoporellid 

 opercula is impossible to establish. 



All of the species do not have ovicells concealed like the geno- 

 type, but they are all much immersed in the distal zooecium. The 

 genotype G. polymorpha Busk is deprived of a spiramen; G. bitur- 

 rita Hincks sometimes has zooecia with spiramen; G. rostrigera 

 Waters, never has them. 



GEPHYROPHORA ROSTRIGERA Waters, 1885 



Plate 29, figs. 6-8 

 1885? Lepralia rostrigera Waters, Chilostomatous Bryozoa from Aldinga, 



Quarterly Journal Geological Society London, vol. 41, p. 248 (not 



Busk, not Smith). 

 1887. Lepralia rostrigera Waters, Tertiary Chilostomatous Bryozoa from 



.New Zealand, Quarterly Journal Geological Society London, vol. 43, 



p. 61, pi. 7, fig. 17. 



