1908] Boberfson. — Incrusting Bryozoa. 283 



This species is reported by Hincks from Queen Charlotte 

 Islands, where it is said to be abundant. In our collection it has 

 been obtained at La Jolla gi'owing on roots of kelp, and dredged 

 between 20 and 30 fathoms off Catalina Islands. 



Porinidae (part) d'Orbigny. 



Memhraniporidce, (part) Busk, 1854. 

 EschariporidcB Smitt, 1867. 

 Porinidce Hincks^ 1880. 



Zoarium incrusting, or erect and ramified. Zooecia with a 

 raised tubular or subtubular orifice, and frequently with a special 

 pore on the front wall. 



Lagenipora Hincks. 



Lagenipora Hincks, 1877. 

 Lagenipora Hincks, 1880. 

 Lagenipora Hincks, 1884. 



Zoaria consisting of a number of zocecia immersed in a com- 

 mon-calcareous crust, or rising into branching masses. Zocecia in 

 the incrusting state, decumbent, lagenif orm ; oral extremity free, 

 tubular, with a terminal orifice. 



The free, tubular portion of the zooecium in Lagenipora is 

 known as a peristome, a structure frequently found in the more 

 highly calcified Chilostomata. The peristome is a secondary cal- 

 careous wall of varying height, and surrounding the original or 

 primary orifice of the zooecium more or less completely. It thus 

 forms a secondary orifice which as in L. spinulosa (pi. 18, fig. 37) 

 ma}^ be ornamented by numerous spines and may rise so high 

 above the primary orifice as to hide it completely ; or it may be a 

 narrow or slightly thickened rim of the primary orifice so low as 

 to be scarcely recognized as a secondary orifice. The peristome, 

 especially when well developed, affords a diagnostic mark of some 

 importance. 



52. Lagenipora spinulosa Hincks. 



PI. 18, fig. 37. 



Lagenipora spinnlosa Hincks, 1884, vol. 1.3, p. 57, pi. 3, fig. 4. 

 Lagenipora spinnlosa Hincks, 1884, vol. 13, p. 210, pi. 9, fig. 4. 



Zoarium incrusting, or erect and branching. Zooecia lageni- 

 form, lower portion adherent, ovate, thickly covered with large 



