NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 707 



Hancock Stations: 468-35, Charles Island, Galapagos; 1399-41, Santa 

 Catalina Island; 1242, Anacapa Island; 1002, San Clemente Island; 

 Palos Verdes, near San Pedro, all from southern California; Acapulco 

 Harbor, Hubbs Sta. 46-244, west coast of Mexico; and Colombia (with- 

 out further data) ; shore to 77 fms. 



Lichenopora intricata (Busk), 1856 

 Plate 76, figs. 5, 6, 7, 8, and 9 



Defrancia intricata Busk, 1856:179. 



Apparently this species has never been referred to since Busk described 

 it. In December, 1946, Dr. E. Y. Dawson, while collecting algae at 

 Mazatlan, Mexico, the type locality of D. intricata, recovered several 

 specimens on algae. Again, in 1949, the "Velero" dredged more than 

 100 specimens at Magdalena Bay, on the west coast of Lower California. 



These specimens conform to Busk's meager description: "Disc very 

 irregular in form, rows of cells radiating irregularly; orifices of cells 

 and interstitial pores of equal size. The small irregular patches appear 

 to be constituted by the confluence of several sets of costae, with their 

 corresponding interstices, each set radiating from a depressed central 

 point." 



The form of the encrusting complex zoaria varies to such an extent 

 as to baffle description ; adnate on algae, worm tubes, corallines, other 

 bryozoans, etc., the largest colonies 3 cm or more in length, the margins 

 of the zoaria sometimes extending free. The subcolonies are very numer- 

 ous, more than 70 having been counted on one large zoarium, and vary 

 in form from nearly round to very elongate-elliptical. The radii 

 ("costae," Busk) are high, closely set, and rather regularly arranged 

 about the low central area ; in general they are uniserial, but often they 

 are biserial next to the central area and rarely biserial for the whole 

 length of the radii ; separated by one or two rows of cancelli. The outer 

 ends of the radii are often extended with short tubules into meandering 

 series which break up into short, separate series or sometimes form small 

 clumps. The subcolonies often arise in the midst of this intricate me- 

 andering series, or they may be closely associated, with the low outer 

 ends of their radii in contact. 



The central area is flat and low, even when ovicells are present. When 

 an ovicell is present it is covered by a thin lamina and above this the 

 secondary cancelli are large, thin-walled and irregular in form, in true 

 Lichenopora fashion. The cancelli between the radii and in the central 

 area, in the absence of ovicells, are rounded and partially closed, sug- 



