256 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



not depressed, oblique but straight; wall ornamented by a single line of 

 coarse pores along the border of the chamber, the middle portion trans- 

 lucent and mostly without pores ; aperture small, rounded, at the base of 

 the last-formed chamber. Maximum length 0.55 mm; maximum breadth 

 0.30 mm. 



Holotype (AHF no. 53) from Station 422. 



The species differs from R. aculeate Cushman in the nearly straight 

 sides, with little or no dentation, the initial end without a spine and the 

 pores of the wall limited almost entirely to the border of the chamber. 



Stations: 63, 76, 221, 222, 244, 311, 422, 436, 457, 458, 470, 500, 

 504, 1026, 2004, 2011, 2015, 2019, 2020, 2039, 2067, 2081, 2082, 2084, 

 2116, 2126,2139, 2153. 



Type locality. — Socorro Island, Mexico in 16 fathoms. 



Distribution. — These station records indicate a range from the Gulf 

 of California, Mexico, southward to Ecuador with a number of localities 

 in the Galapagos Islands. The depth range is from 3 to 80 fathoms. 



Genus GHRYSALIDINELLA Schubert, 1907 

 Chrysalidinella spectabilis Cushman and McCulloch, new species 



Plate 32, Figs. 1-7 



Test elongate, early portion triserial and triangular in section, very 

 soon becoming uniserial, the adult portion either triangular, quadrangu- 

 lar or in some specimens compressed ; chambers distinct, increasing gradu- 

 ally in breadth but very little in height in the adult uniserial portion; 

 sutures distinct, slightly depressed in the adult; wall ornamented by 

 longitudinal costae, those of each chamber distinct, the angles of the test 

 in the adult often with very thin, transparent keels, the initial end some- 

 times slightly spinose; apertures terminal, numerous, rounded, with thin, 

 raised borders. 



Length up to 1.25 mm; diameter of triangular forms up to 0.55 mm; 

 of broader compressed forms up to 0.65 mm. 



Holotype (AHF no. 54) from Station 2065. 



This species differs from C. dimorpha (H. B. Brady) in the orna- 

 mented surface, more tapering test, and tendency toward a quadrangular 

 or compressed shape. 



Our series of figures shows the range of variation in the adult stages 

 of this species which is unique in this respect. 



