144 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Scrupocellaria regularis Osburn, 1940 

 Plates 18, figs. 3 and 4, and 20, fig. 3 

 Scrupocellaria regularis Osburn, 1940 :384 ; 1947 : 19. 

 Cellularia cervicornis^Smitt, 1872:14 (non Busk). 



Zoarium erect with flabellate branches ; the internodes long with often 

 10 or more zooecia in a series; the joint crosses the base of the opesia of 

 the outer zooecium. 



Zooecia rather short (0.35 to 0.40 mm), half as wide as long, and 

 closely set, very regular in the arrangement of all structures. The opesia, 

 which is elliptical, occupies about two-thirds of the frontal length ; mural 

 rim thin and slightly elevated, the cryptocyst narrow and finely granu- 

 lated ; the scutum when fully developed covers nearly all of the opesia be- 

 low the aperture, with a very symmetrical alcicorn decoration, and the 

 proximal corners are pointed ; the full complement of spines is six, 4 outer 

 and 2 inner, rather strong, and the proximal outer and inner ones are 

 occasionally bifurcate. The frontal avicularia are of moderate size, nu- 

 merous and none of them enlarged ; the lateral avicularia are all small, 

 occasionally wanting. The vibracula, on practically every zooecium, are 

 large (more than half of the zooecial length), visible from the frontal 

 view, the groove longitudinal, the seta sometimes as long as 4 zooecia. 

 The radicle chamber is large, located at the outside of the proximal end 

 of the vibracular chamber ; radicle fibers strong, straw colored, occa- 

 sionally with retrorse hooks. 



Ooecia large, conspicuous, covering the distal zooecia beyond the 

 proximal lip of the opesia, the tip elevated, perforations moderately large 

 and without tubules. 



Known hitherto only from the Atlantic, Gulf of Mexico, Caribbean 

 Sea and Bermuda. Pacific specimens do not appear to differ in any re- 

 spect except that the bifurcating spines are rare. 



Hancock Stations: 557-36, ofiF White Rock, Isla Partida, Gulf of 

 California, 45 fms, several colonies ; also U. S. National Museum No. 

 1474 (other data lacking). 



Scrupocellaria scabra (van Beneden), 1848 

 Plates 18, fig. 5, and 22, fig. 2 

 Cellarina scabra van Beneden, 1848 :73. 

 Scrupocellaria scabra, Hincks, 1880:48. 



Zoarium moderately stout, biserial, internodes 3 to 7 or more zooecia 

 in a series, joint crossing immediately proximal to the opesia of the outer 

 zooecium or involving it slightly. Zooecia moderate in size (0.40 to 0.55 

 mm long) ; the outer edge slightly curved. The opesia occupies about 



