84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 16 



1280-41 (1), 1316-41 (2), 1335-41 (2), 1338-41 (1), 1340-41 (1), 

 1662-48 (1), 1680-49 (1), 1903-49 (1), 1938-50 (1), 1942-50 (1), 

 1944-50 (1). Isthmus Cove, Santa Catalina Island, July 12, 1919 (2). 

 Hubbs 47.13 B (1). Cat. nos. 45.1-45.19. 



Distribution: In the Gulf of California north of Isla Partida and 

 at Puerto Escondido in depths of 5-76 fms. In the Channel Islands and 

 on adjacent banks in depths of 15-60 fms. Sta. 1944-50 is 6.5 mi south- 

 west of San Carlos Point, Lower California, 20 fms. 



Genus GYATHOGERAS Moseley 



Cyathoceras Moseley (1881), Rep. Sci. Res. Voy. H.M.S. Challenger, 

 Zool., vol. 2, p. 156. 

 Genotype: Cyathoceras cornu Moseley. 



Gyathoceras foxi Durham and Barnard, new species 

 Plate 10, figs. 46a, b 



Corallum trochoid or subturbinate, attached by a well-defined base; 

 calice angular, subcircular ; septa thin, in 5 cycles, interspaces slightly 

 narrower than thickness of primary septa; primary and secondary septa 

 exsert (2.5-3.0 mm), tertiaries nearly as exsert, later cycles successively 

 less exsert; primary and secondary septa attached to columella, occa- 

 sional tertiary septum attached at depth; fourth and fifth cycle septa 

 extend one- fourth to one-third the distance to the columella; septa well- 

 rounded above, mostly broken, inner edges vertical, slightly crinkled, 

 minutely granulated ; septal faces with numerous, well-defined granules ; 

 costae granulated, evident only near top of corallum, granules running 

 in lines to base; costae of earlier cycles, especially the first and second, 

 much more evident than those of later cycles; costal interspaces gran- 

 ulated, somewhat flat-bottomed, irregular in development, usually one- 

 half the width of the largest adjoining costa; columella small, fascicular, 

 one-fifth the width of the calice, composed of a few finely and highly 

 contorted, elevated pieces. Outer surface of corallum with occasional 

 calcareous nodules. 



Remarks: This species may be distinguished from Cyathoceras 

 quaylei Durham by the smaller, elevated columella composed of finely 

 divided and contorted pieces rather than twisted ribbons, and by the 

 more prominent first and second cycle costae. 



Dimensions of holotype: Height 15 mm, calice 14 by 16 mm. 



Holotype: AHF no. 14. 



