284 University of California Publications in Zoology. [Vol.4 



pores; upper or oral portion free, tubular, produced, expanded 

 toward the oral rim, suberect, surface smooth, hyaline (pi. 18, 

 fig. 37). Orifice terminal, sometimes a shallow sinus, s., formed 

 partly by the high avicularian peduncles rising on each side, 

 partly by the flaring outward and forward of the frontal wall 

 of the tubular portion or peristome; dorsal wall of tubular por- 

 tion flaring outward and bordered by five to seven long, delicate 

 spines. A small sessile avicularium, av., on each side of the ori- 

 fice, elevated on a peduncle which is sometimes of extraordinary 

 height, mandible pointed and directed away from the orifice; 

 usually a denticular process, d., on the peduncle below the avi- 

 cularium. Ooecium, oe., small, rounded, smooth except for a wide 

 band extending across the front which is thickly punctate ; set far 

 down at the back of the tubular portion of the zoa?cium ; the avi- 

 cularian peduncles and sometimes a portion of the front tubular 

 wall often rising in front of the ooecium almost completely hid- 

 ing it when viewed from the front. 



This beautiful species is described by Hincks from Queen 

 Charlotte Islands. Both description and plate suggest that that 

 observer possessed only mutilated colonies. In the unmutilated 

 state the spines are extremely delicate and in protected positions 

 they attain an extraordinary length; the tubular portion of the 

 zoa?cium also is easily and frequently broken. The avicularian 

 peduncles are often much longer than they are represented in 

 the drawing (fig. 37 av.). 



Lagenopora spinulosa has been rarely obtained, a few small 

 colonies having been found on Retepora pacifica from Catalina 

 Island, and a specimen of the erect form from Pacific Grove, 

 California. 



Myriozoidae (part) Smitt. 



CeUeporidce (part) Johnston, 1847. 

 PorinidcB (part) cl'Orbigny, 1850-52. 

 MemhraniporidcE (part). Busk, 1854. 

 Myriozoid(B (part) Smitt, 1867. 



Zoarium incrusting, or rising into foliaeeous expansions, or 

 dendroid. Zooecia calcareous, destitute of a membranous area 

 and raised margins. Orifice with a sinus on the lower lip. 



