NO. 6 CUSHMAN, MCCULLOCH : LAGENIDAE 309 



Marginulina hancocki Cushman and McCulloch, new species 

 Plate 40, Figs. 9-11 



Test elongate, several times as long as wide, somewhat compressed, 

 especially in the early coiled portion, periphery with a distinct keel in 

 the earlier portion, base broadly rounded ; chambers distinct, numerous, 

 those of the early portion close coiled and strongly compressed, later 

 becoming uncoiled and inflated, increasing rather rapidly in height but 

 of rather uniform width; sutures distinct, earlier ones strongly curved, 

 later ones oblique and depressed ; wall smooth ; aperture radiate, on the 

 dorsal angle of the last-formed chamber. Length up to 4.5 mm. ; breadth 

 up to nearly 1 mm. 



Holotype (AHF no. 66) from Station 2005. 



This species differs from M. bacheii Bailey in the more coiled early 

 portion, nearly parallel sides, and the development of a distinct keel. 



Stations: 1112, 1161, 1238, 278, 2005, 2010, 2029, 2033, 2057, 2097, 

 2098, 2131, 2156, 2160, 330, 406, 416, 432, 438, 441, and 452. 



Distribution. — The type locality is San Jaime Bank, Lower Cali- 

 fornia, Mexico in 75 fms. The first three stations listed are off the 

 Channel Islands with a depth range of 38 to 150 fms., the average being 

 79 fms. Stations 278 through 2160 off Mexico and in the Gulf of Cali- 

 fornia have a depth range of 44 to 95 fms., the average being 63 fms. 

 Station 330, off Cocos Island, is 47 fms. and Stations 406 to 452, off 

 Galapagos Islands, give a range of 24 to 100 fms., the average being 

 52 fms. The greatest number of specimens were found off Chatham 

 Island, Galapagos. 



Marginulina bacheii Bailey 



Plate 40, Fig. 12 



Marginulina bacheii Bailey, Smithsonian Contrib., vol. 2, Art. 3, 



1851, p. 10, pi , figs. 2-6.— Cushman, Bull. 104, U. S. Nat. Mus., 



pt. 4, 1923, p. 129, pi. 36, figs. 7-9 ; Bull. Geol. Soc. Amer., vol. 47, 1936, 

 pp. 422, 428.— Parker, Bull. Mus. Comp. Zool., vol. 100, 1948, p. 239 

 (list),pl. 3, fig. 1. 



Marginulina ensis Flint (not Reuss), Ann. Rep. U. S. Nat. Mus., 

 1897 (1899),p. 314, pi. 59, fig. 3. 



Test much elongate, subcylindrical, only slightly tapering, often 

 slightly curved, often somewhat compressed, especially in the early por- 

 tion, ventral side usually somevi^hat lobulate; chambers distinct, becom- 

 ing uncoiled very early, increasing rapidly in size as added ; sutures 

 distinct, depressed ; wall smooth, aperture at the dorsal angle of the last- 

 formed chamber, radiate. Length up to 4 mm. 



