NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 487 



tremopores, in older stages of calcification the zoarial surface becomes 

 nearly level. The peristome is raised in young zooecia, but rather low for 

 this genus, the walls smooth and thick; in old zooecia the thickened 

 frontal wall more or less obscures the peristome. There is the usual 

 pair of avicularia on the rim of the peristome, set a little in advance of 

 the middle of the aperture. The primary aperture is slightly elongate, 

 0.12 mm long by 0.10 mm wide. There are no avicularia except the oral 

 ones and no spines or other external characters. 



The ovicell, 0.20 mm wide, is situated at the base of the peristome 

 and opens into it well above the primary aperture, but with advancing 

 calcification becomes more or less embedded ; it bears the usual finely 

 punctate semicircular area on the upper surface. 



The species has some resemblance to L. punctulata, especially in 

 its erect zoarial form and rounded branches, but it is much smaller, 

 smoother, the peristome does not rise above the ovicell and the zooecia 

 become more embedded with age. 



Type, AHF no. 108. 



Type locality, Banderas Bay, west Mexico, 20 to 40 fms, 9 colonies 

 and fragments, collector, George Willett. Also Hancock Station 270, 

 Angel de la Guardia Island, Gulf of California, 14 fms; and off Puerto 

 Escondido, Lower California, 34 fms. Also at Guadalupe Island, west 

 of Lower California, 40 fms, C. L. Hubbs, collector. 



Lagenipora spinulosa Hincks, 1883 

 Plate 59, fig. 6 



Lagenipora spinulosa Hincks, 1883 :31 ; 1884 :40 (in part) . 

 Lagenipora spinulosa, Robertson, 1908 :283 (in part). 

 Lagenipora spinulosa, O'Donoghue, 1923 :33 ; 1926 :74. 

 Lagenipora spinulosa, Canu and Bassler, 1923 :171. 

 Lagenipora spinulosa, Hastings, 1930:730. 



The zoaria form small irregular incrustations on shells, worm tubes, 

 the stems of hydroids and bryozoans, etc. The zooecia are lageniform, 

 about 0.50 mm long by 0.30 mm wide, usually oriented very irregularly, 

 the frontal inflated and coarsely punctate. The peristomes are high, often 

 as long as the zooecial body, the proximal side smooth and hyaline, the 

 sides striate to the tip which is somewhat expanded ; the proximal lip 

 is usually simply flared outward but may bear one or two low points; 

 the distal border is provided with several long spinous processes, some 

 or all of which may be lacking. A small avicularium on either side rises 



