19111 1 Robertson: Cyclostomatous Bryozoa. 231 



species he found there, and in view of the abundance of related 

 or somewhat similar, though not identical species on this coast, 

 there is reason to doubt his identification. The spiny species 

 of Crisia which occurs on the Pacific coast is ('. edwardsiana 

 (pi. 19, fig. 10). Without a close comparison of ovicells, C. 

 comuta and ('. edwardsiana might very easily be mistaken for 

 each other. The fact, then, that C. geniculata occurs Inn' in 

 company wilh ('. edwardsiana is additional proof of its specific 

 distinctness, and strengthens the view that it is not permissible 

 to rank it as a variety, nor even as a sub-species, of any other 

 form. That the species found here is ('. geniculata is undoubt- 

 edly true, since the shape and size of the oiecium. the position 

 and shape of the tube of the oceciostome and the position of the 

 ocecium in the internode agree with the diagnoses given for this 

 species obtained elsewhere. 



An irregularity of growth is shown in this species, especiallj 

 in some material obtained from a southern station (pi. 1!), fig. Si. 

 This is a tendency to form internodes of more than one zooecium, 

 and is a variation which characterizes both the ordinary inter- 

 nodes and the ocecial internodes. In the drawing (tie-. 8), the 

 ooecial internode is shown to consist of five zocecia, the oiecium 

 being the third member of the internode. 



Crisidia gracilis Trask I '57) may refer to this species. No 

 account of the ovicell is given by that investigator and only a 

 meager description of the species, so that identification of his 

 species must remain a matter of conjecture. 



C. geniculata is found in considerable abundance between tide marks 

 at Lands End and Fort Point, San Francisco Bay, at Pacific Grove, Mon- 

 terey Bay, and at Dillon's Beach, California; also at Deadman 's Island, 

 San Pedro, and on the rocks of the breakwater at Zuniga Point, Southern 

 California. Dredged at numerous stations from San Pedro to Point 

 Firmin, Southern California, in depths ranging from 2 to 30 fathoms. 



86. Crisia edwardsiana (d'Orbigny) Husk. 



PI. 19. figs. 9. 10. 



Crisidia edwardsiana d'Orbigny, L839, p. 8, pi. I. figs, 1 8. 

 Crisia edwardsiana, Busk, 1875, p. 5, pi. 2, figs. 5-8. 

 'Crisia comuta, Hincks, 1884, p. 203. 

 Crisia edwardsiana, Jullien, 1888, p. 81. 

 Crisia comuta, Robertson, 1900, p. 328. 



