191 °] Robertson: Cyclostomatous Bryozoa. 245 



Ooeciostome (oest.) at the summit of the ooecium, circular; tube 

 of ooeciostome (fig. 21, oest. t.) typically a relatively long pipe, 

 bent forward at right angles and inclined somewhat to one side 

 of the longitudinal axis of the ocecium. Oceciopore sometimes 

 circular (fig. 21, oep.) sometimes flattened (fig. 20, oep.). 



In this species we find considerable variation both in the 

 length of the ovicell, and in the shape of its aperture. Observa- 

 tion of twenty-five cases shows that, typically, the ocecium occurs 

 low iii the internode. It is then relatively short, and the tube of 

 the ooeciostome is distinctly a small pipe-like stem projecting 

 from the top of the ovicell as shown in fig. 21 or fig. 20. In 

 cases where the ooecium is the ninth or eleventh member of an 

 internode, it often attains a great length, sometimes being twice 

 as long as in cases where it is the third member of its internode 

 The ocecial aperture in these longer oeecia is often short and bent 

 forward very little, sometimes opening directly upward. 



No complete colonies of C. pugeti were obtained. The material though 

 abundant was brittle and broken. Dredged at Friday Harbor, San Juan 

 County, Puget Sound; depth not known. 



Tubuliporidae. 



Tubiporadae Fleming, 1828. 

 les Tubulipores, Milne-Edwards, 1837. 

 Tubuliporidae (part) Johnston, 1S47. 

 Sparsidae, d'Orbigny, 1850-52. 

 Tubuliporidae, Busk, 1859. 

 Tubuliporidae, Smitt, 1866. 

 Tubuliporidae, Hincks, 1880. 



Zoarium entirely adherent, or more or less free and erect, 

 multiform, often linear, or flabellate, or lobate, sometimes cylin- 

 drical. Zocecia tubular, disposed in contiguous series, or in single 

 lines. Ooecium au inflation of the surface, or a modified zocecium. 



KEY TO THE GENERA OF TUBULIPORIDAE. 



1. Zoarium a circular, or fan-shaped, or lobed expansion, usually 



adnate 6 



1. Zoarium not adnate, except in some 3'oung stages 2 



2. Zoarium erect, branched 3 



2. Zoarium erect, growing in tortuous, bilaminate expansions 



Mesenteripora 



