NO. 4 CUSHMAN AND MCCULLOCH : SOME VIRGULININAE 213 



horizontal, slightly depressed in the adult portion; wall finely perforate, 

 smooth, except for the early portion, which has numerous, fine, longi- 

 tudinal costae, sometimes running up halfway of the length of the test; 

 aperture elongate, narrow at the base, and somewhat expanded at the 

 upper end. Length 0.35-0.40 mm.; breadth 0.10-0.12 mm.; thickness 

 0.03-0.04 mm. 



The types are from the Atlantic of? Florida, and most of the records 

 are from the Atlantic. Recently it has been recorded by Asano from off 

 Japan. 



Stations: 118, 222, 226, 473, 535, 536, 573, 579, 1010, 1041, 2070. 



Distribution. — In Monterey Bay, California, in 25 fms. ; off Socorro 

 and Guadalupe islands, Mexico, in 4 to 250 fms. ; off Hood Island, Gala- 

 pagos, in 75 fms.; off Peru in 12 to 22 fms. 



Bolivina subadvena Cushman, var. serrata Natland 

 Plate 26, Fig. 14; Plate 27, Figs. 1, 2 



Bolivina subadvena Cushman, var. serrata Natland, Bull. Scripps 

 Instit. Oceanography, Tech. Sen, vol. 4, 1938, p. 145, pi. 5, figs. 8, 9. 



"Test elongate, compressed; periphery acute, serrate, with spines 

 formed by the pointed ends of the chambers extended in a downward 

 direction beyond the previous chambers; initial end of the microspheric 

 form pointed, and rounded in the megalospheric ; apertural end broadly 

 rounded; chambers slightly keeled, distinct, usually ten to eleven pairs; 

 sutures cui-ved, limbate; walls smooth with rather large perforations for 

 the size of the test; aperture elongate, loop-shaped, terminal." Length 

 0.40-0.45 mm. ; breadth 0.20-0.24 mm. ; thickness 0.10-0.12 mm. 



The types are from off the coast of southern California. In our col- 

 lections this variety has been found to be common at some of the many 

 stations and to keep its characters rather well. There is a tendency in 

 some specimens toward Bolivina marginata Cushman, var. adelaidana 

 Cushman and Kleinpell. 



Stations: 55, 59, 60, 79, 80, 83, 136, 144, 215, 230, 271, 422, 512, 

 513, 516, 517, 543, 1010, 1011, 1047, 1068, 1070, 1071, 1075, 1076, 

 1077, 1078, 1096, 1097, 1100, 1101, 2087, 2093, 2100, 2107, 2113, 

 2116, 2134, 2136, 2140, 2149, 2152, 2153. 



Distribution. — The numerous station records extend from off Santa 

 Cruz and Santa Barbara islands, California, in 14 to 127 fms.; southward 

 off Mexico and in the Gulf of California, Mexico, in 10 to 183 fms. 



