236 I' a in rsity of California Publications in Zoology. [Vol. 6 



Zntiriii composed <>f numerous delicate branching tufts, some- 

 times stiff and straight, sometimes forming rather loose masses 

 of elongated zooecia, 15 to 25 mm. in height (pi. 18, fig. 6) ; found 

 at the roots of other bryozoa, on seaweed at low tide attached by 

 jointed rootlets. Internodes consisting typically of a single 

 zooecium (fig. 7, zoe.), each zocecium giving rise to a pair of 

 branches, each branch arising on the side of a zooecium in a 

 basis rami (ba. r.) adnate to the zooecium which gives origin to 

 it. Joints (j.) light colored in the younger portions of the 

 colony, growing brown or black in the older parts. Zooecia long. 

 slender, slightly curved, if at all; divided into two portions by 

 the flexible joint. Ooscia (oc.) elongated, straight, narrowed 

 below, slightly inflated above. Ocecial internode consisting 

 typically of three members of which the ocecium is the second; 

 the third 3 3 being an elongated slender tube adnate to the dorsal 

 side of the ocecium and extending above it; consisting sometimes 

 of five members (pi. 19, fig. 8), with the ocecium as the third 

 member and two zooecia adnate to its dorsal surface, z' and z 5 . 

 Oceciostome (fig. 7, oest.) large, its tube bent sharply forward. 

 Oo&ciopore (oep.) narrow and slit-like; in a few instances the 

 tube of the oceciostome upright, and oceciopore circular. 



As Harmer ('91) has pointed out. this species has been con- 

 sidered by many of the older writers as a mere spineless variety 

 of Crisia cornuta. It is true that without its spines a branch 

 of C. cornuta can scarcely be distinguished from C. geniculata. 

 The same is true also of C. edwardsiana and C. geniculata. 

 Indeed, all uniserial species of Crisia have so similar an appear- 

 ance when the zoreeia alone are considered that it is impossible to 

 separate them with any degree of certainty on that feature only. 

 It is only when the ovicells are compared that an adequate 1 basis 

 of separation is obtained. The figures of Busk ( '75, pi. 1, figs. 

 2 and 10) show clearly the difference in the shape and internodal 

 position of the ovicells of C. geniculata and C. cornuta respect- 

 ively. Likewise, a comparison of Harmer's figures (pi. 12, figs. 

 7 and 8, and fig. 9) should convince one of the specific difference 

 in these two forms. C. cornuta does not occur on this coast to my 

 knowledge. Hincks ("8-4) reports it from Queen Charlotte 

 Islands, but gives neither verbal description nor plate of the 



