NO. 1 DURHAM, BARNARD: EASTERN PACIFIC STONY CORALS 83 



ing V-shaped towards base, approximately as wide as first cycle septa; 

 columella papillose, consisting of the granulated, somewhat irregular 

 inner ends of the paliform lobes of the third and fourth cycle septa. The 

 costae at one end of the corallum are nodose a short distance below the 

 top of the calice, apparently representing a resting stage in the growth of 

 the individual. 



Remarks: This species is differentiated from Ceratotrochus laxus 

 Vaughan by the large papillose columella, the greater number of septa, 

 and the oval calice. It closely resembles certain fossil forms such as 

 Ceratotrochus duodecimcostatus var. gibbosus Montanaro (Pal. Ital., 

 vol. 31, p. 74, pi. 4, figs. 14a, 14b, 14c, 1931) which have the large 

 columella, oval calice, and greater number of septa. 



Dimensions of holotype: Height 23 mm, calice 16 by 22 mm. 



Holotype: AHF no. 13. 



Type locality: Sta. 1106-40, off San Francisco Island, Gulf of 

 California, 43-44 fms. 



Material examined: The type. 



Genus GOENOCYATHUS Milne Edwards and Haime 



Coenocyathus Milne Edwards and Haime (1848), Ann. Sci. Nat., sen 

 3, vol. 9, pp. 297-298. 

 Genotype: Coenocyathus cylindricus Milne Edwards and Haime. 



Coenocyathus bowersi Vaughan 

 Plate 10, figs. 45 a-d 



Coenocyathus bowersi Vaughan (1906), Proc. U.S. Nat. Mus., vol. 30, 

 no. 1477, p. 847, pi. 77, figs. 1-3; Durham (1947), Geol. Soc. 

 Am., Mem. 20, p. 34. 



This species is extremely variable in development, the corallites of 

 one colony being large in diameter, of another small, of still another 

 colony short and crowded, of a fourth long and diverging. Hypotype 

 cat. no. 45.2 shows an example of typical intratentacular budding and 

 hypotype cat. no. 45.1 exhibits multiple fission. 



This species was recorded previously from northeast of Point Pinos 

 Lighthouse, Monterey Bay, from the Channel Islands, and south to 

 San Diego. It is found in depths of 30-111 fms. 



Hypotypes: Cat. no. 45.1 (Sta. 593-36), cat. no. 45.2 (Sta. 978- 

 39), cat. no. 45.7 (Sta. 1279-41), cat. no. 45.8 (Sta. 1280-41). 



Material examined: Stas. 593-36 (2), 978-39 (1), 1081-40 (2 

 immatures), 1177-40 (1), 1190-40 (1), 1276-41 (1), 1279-41 (1), 



