52 PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 



compressed, their dorsal — that is to say, the side opposite the basal 

 lamella — is very narrow and the tubes there are visible in part of 

 their length. The peristomes are grouped in transverse rows but 

 oriented obliquely in the direction of the latter. The tubes in their 

 length are curved almost at right angles to the basal lamella. 



The longitudinal section indicates cylindrical tubes with triparietal 

 gemmation. But it is a deceiving indication, this section not being- 

 made in the same direction as the tubes. The mode of gemmation 

 is indicated, on the contrary, by the meridional section and is in 

 reality dorsal as in the other Diastoporas. The walls of the tubes 

 are vesicular as in Heteropora claviformis Waters, 1904. The base 

 of a rather large colony is small, suborbicular ; it is the primitive 

 Berenicea form in which the concentric striae may be seen (fig. 6). 

 The first branches arise a little farther away on the same substratum 

 in order to give solidity to the ensemble. In reality Reticulipora 

 is formed only of free branches of an encrusting colony. We have 

 not yet observed the oeciostome on the ovicell of this species. It is 

 not yet a true Diaperoecia. 



Occuri'ence. — -Galapagos Islands, D. 2815. 



C oty pes.— C?it. No. 8528, U.S.N.M. 



DIAPEROECIA FLABELLATA Canu and Bassler, 1923 



1923. Diaperoecia flahellata Canu and Bassler, Later Tertiary and Quater- 

 nary Bryozoa of North America, Bull. U. S. Nat. Mus. No. 125, p. 202, 

 pi. 13, figs. IS, 19. 

 Our specimens are simple, bifurcated, dead fragments. They are 

 ovicelled. The tubes are grouped in linear series somewhat more 

 Hccentuated than on our figures of 1923. This is a typical Diaperoecia 

 with oeciostome on the nonmarginal ovicell. 

 Occurrence. — Galapagos Islands, D. 2813. 

 Cat. No. 8529, U.S.N.M. 



Family TUBULIPORIDAE Johnston, 1838 



Genus TUBULIPORA Lamark, 1816 



TUBULIPORA, species 



Plate 14, Figure G 



The small figured specimen incrusts a shell. It does not coincide 

 exactly with any published figure. The bundles have three tubes at 

 most. The peristome measures approximately 0.12 mm. and the 

 orifice 0.08 mm. The oeciostome is a tube smaller than the others, 

 little salient with transverse orifice. 



Occurrence. — Galapagos Islands, D. 2815. 



