260 Univ( rsity of California Publications in Zoology. L VoL - 6 



A specimen obtained at Juneau, dredged in ten fathoms and formerly 

 identified as an entalophora (:00, p. 328) is now thought to be a young 

 colony of H. pelliculata. Obtained also on Channel Bocks, Puget Sound, 

 at extreme low tide; dredged at San Juan County, Puget Sound, from 

 a depth unknown, and obtained at an unknown locality farther south, 

 probably on the coast of northern California. 



Lichenoporidae Smitt. 



lAehenporidae Smitt, 1866. 

 Discoporellidae Busk, 1875. 

 Lichenoporidae, Hincks, 1880. 



Zoarium discoid, adnate or partially free. Zoaeia tubular, 

 erect or suberect, disposed in series which radiate from the 

 center; central part of a colony cancellated or porous, the can- 

 celli or pores extending into the spaces between the series of 

 zocecia, partially immersing them. 



Lichenopora Defrance. 



Lichenopora Defrance, 1823. 

 DiscoporcUa Gray, 1848. 

 Discoporella, Smitt, 1866. 

 Discoporella, Busk, 1875. 

 Lichenopora, Hincks, 1880. 

 Lichenopora, Waters, 1890. 

 Lichenopora, Harmer, 1896. 



Zoarium disk-shaped, flat on the under surface by which it is 

 attached to the substratum to which it closely adheres, more or 

 less convex on the upper surface ; originating in a primitive disk, 

 the calcified larval body, from which grow the tubular zooecia 

 curving right and left, forming a fan-shaped, then a circular 

 expansion. Zoaeia in radiating rows either in single series, or 

 in several connate series. Cancelli numerous in the central 

 portion of the disk as well as between the radiating rows of 

 zocecia. Ocecium an inflation of the surface; oceciostonn 

 distinctive for each species. 



In size, habitat, and superficial appearance colonies of 

 Lichenopora closely resemble those of Tubulipora. The differ- 

 ence, which is easily detected upon slight magnification, lies in 

 the cancelli which appear in the spaces between the series of 

 zooecia and over the central space between the bases of zoo?eia. 



