94 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



This is one of the most common species in our collections. Except 

 that the specimens are consistently smaller than the Atlantic ones, the 

 other characters appear to be the same and hardly warrant any varietal 

 status. Localities: 2008, 2017, 2048, 2037, 2069, 2018, 2024, 2023, 

 505, 541, 546, 553, 2010, 2005, 2009, 2016, 2070, 555, 296, 519, 504, 

 113, 508, 2035, 256, 2029, 2012, 2064, 2058, 2051, 2043, 2065, 2036, 

 2063, 2033, 2057, 2025, 2026, 294, 225, 298, 239, 290, 241, 286, 

 242, 283, 246, 249, 252, 285, 278, 253, 223, 584, 332, 587, ???38, 

 217,250,540. 



Distribution. — Catalina Harbor in 30 fms. ; numerous stations off 

 Mexico, in the Gulf of California, southward to La Libertad, Ecuador. 



Gaudryina (Pseudogaudryina) atlantica (Bailey) var. pacifica 



Cushman and McCulloch, new variety 



Plate 9, Figs. 1, 2 



Variety differing from the typical in the much smoother surface, 

 smaller size and more nearly horizontal sutures. 



Holotype of var. (AHF no. 14) from locality 230. The variety 

 also occurs at localities 2005, 2010, 2064, 2065, 230, C-9. 



There is a considerable amount of variation in this form as our 

 figures indicate and there are intermediate specimens that seem to indi- 

 cate that it is but a varietal form. 



Distribution. — Type locality, off San Benito Island, in 121 fms. 

 Additional stations off Mexico, including the Inner and Outer Gorda 

 Banks, in 50-82 fms. At Arvila Pier, California, it was collected in 

 7 fms. 



Genus RUDIGAUDRYINA Cushman and McCulloch, new genus 



Test in the early stages triserial, at least in the microspheric form, 

 followed by a biserial series as in Gaudryina and in the adult with the 

 chambers in an irregular spreading series; wall finely arenaceous, firmly 

 and smoothly cemented ; aperture in the adult chambers generally termi- 

 nal, rounded, often with a slight lip. 



Genoholotype, Rudigaudryina inepta Cushman and McCulloch, 



new species 



This genus is evidently derived from Gaudryina by the addition of 

 the peculiar irregular growth which is often much greater in size than 

 the original biserial portion. 



