276 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Genus HOPKINSINA Howe and Wallace, 1933 



Hopkinsina hancocki Todd, new species 



Plate 35, Fig. 1 



Test small, delicate, attenuated, with peripheiy strongly indented, 

 greatest diameter across last two chambers; chambers few, globose, sep- 

 arated from adjacent ones; sutures deeply depressed; wall thin, trans- 

 parent in well preserved specimens, bearing 3 or 4 high, sharp, serrate 

 costae per chamber, not continuous across sutures, sometimes obsolete 

 toward the apertural end of the test, becoming spinous at the initial end 

 of the test and obscuring the first-formed chambers; aperture at the flar- 

 ing end of a long, prominent neck. 



Length 0.37-0.52 mm; diameter (including costae) 0.20-0.27 mm. 



Holotype (AHF no. 59) from Station 416, where it is common and 

 beautifully preserved. 



This species somewhat resembles Uvigerina porrecta H. B. Brady 

 from the Indo-Pacific region but the chambers are globose rather than 

 angular, and the costae are fewer and much higher and sharper. The 

 species is placed in the genus Hopkinsina as it becomes biserial in the 

 adult. 



It also occurs less commonly and in less typical form at the following 

 additional stations: Lowe 1, 200, 409, 511, 512, 513, 583, 1122. 



Distribution. — The type locality, Station 416, is north of Duncan 

 Island, Galapagos Islands, in 35 to 68 fms. With the exception of Station 

 1122, ofif Catalina Island, in 208 fms, the other records are off Central 

 America, off the Galapagos Islands, and off the coast of Ecuador. 



Hopkinsina oceanica Todd, new species 

 Plate3S, Fig. 2 



Test fusiform, attenuated, initial end pointed, periphery lobulated; 

 chambers distinct, strongly inflated, rapidly increasing in size as added 

 until the last two or three, the last several pairs of chambers biserially 

 arranged ; sutures distinct, deep, not curved ; wall thin, ornamented by a 

 combination of high, sharp, serrate costae and coarse, sharp, thickly set 

 spines; aperture circular, at the end of a prominent neck, surrounded by 

 a fragile lip. 



Length 0.42-0.52 mm; breadth 0.22-0.25 mm; thickness 0.17- 

 0.20 mm. 



Holotype (AHF no. 60) from Station 513. 



