98 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



tracts (23 in the upper 0.28 and 8o° in the remaining 

 length). The angles at the levels of change are fairly sharp. 

 The aboral end is pointed, but not prolonged. 



The wall is subuniformly 0.12 oral diameter in thickness 

 in the neck, and thins to nearly half as much below; in the 

 lower bowl it thickens a bit. There are thin laminae and 

 enclosed homogeneous material. 



Length, 76 to 88fi. 



Undella hyalinella resembles U. clevei closely, but is pro- 

 portionately thinner, and has pronounced nuchal contraction; 

 in similar ways it differs from U. ostenfeldi. It is a distinct 

 little form, not likely to be confused with others. 



Recorded from five stations in the Pacific, as follows: three 

 (115, 127, 128) in the North Pacific middle latitudes, one 

 (118) in the East Asiatic marginal sea, and one (130) in the 

 California region. 



There are 4 pump and 1 net samples, of which 1 was 

 taken at the surface, and 2 each at 50 and 100 meters. 

 Frequency, 5 per cent at station 130; other records mini- 

 mum. 



Temperature: pump samples io?i8-i5?85 (n?82), net 

 sample i2?9i. Salinity: pump samples 32.75-34.63 (33.68), 

 net sample 33.40. Density: pump samples 25.04-25.85 

 (25.47), net sample 25.19. pH: pump samples 8.06-8.21 

 (8. 11), net sample 8.26. 



Undella ostenfeldi Kofoid and Campbell 

 Undella ostenfeldi Kofoid and Campbell, 1929, p. 264, fig. 504. 



The tiny lorica is stout, goblet-shaped, and 2.17 oral 

 diameters in length. The oral margin is thin, simple, and 

 erect. The suboral fifth forms a barely flaring collar-like 

 region, below which the bowl expands to 1.1 oral diameters 

 near 0.6 total length from the rim, and then becomes sub- 

 conical (75°). The aboral end is obtusely pointed. 



The wall reaches a maximum thickness of 0.15 oral 

 diameter suborally, and thins down to less than half as much 

 in the lower bowl. There are thin laminae with enclosed 

 hyaline matter. 



Length, 46 to 51 j^l. 



Undella ostenfeldi differs from both U. hyalinella and U. 

 clevel in its stouter proportions, and has a much less con- 

 stricted throat than U. hyalinella. In many ways it resembles 

 a miniature U. parva, although not close to that species in 

 that it has slight suboral differentiation. 



Recorded from four stations in the Pacific, as follows: two 

 (45, 78) in the Galapagos region, one (63) in the South 

 Pacific middle latitudes, and one (97) in the region of South 

 Pacific island fields. 



There are 3 pump samples and 1 net sample, of which 2 

 were taken at the surface, and 1 each at 50 and 100 meters. 

 Frequency, 5 per cent at station 78; 2 loricae in a pump 

 sample at station 45; average, 1.3 loricae. 



Temperature: pump samples i5?84~28?32 (22?i9), net 

 sample 24^38. Salinity: pump samples 34.58-35.26 (35.01), 

 net sample 36.03. Density: pump samples 22.45-25.48 

 (23.41), net sample 24.33. pH: pump samples 8.08-8.16 

 (8.12), net sample 8.14. 



Undella parva Kofoid and Campbell 

 (Figure 103) 

 Undella parva Kofoid and Campbell, 1929, p. 264, fig. 508. 



The fairly large lorica, of hyalina-Yike form, has an angled, 

 pointed aboral end, and its length is 2.56 oral diameters. 

 The oral margin is thin, erect, and inturned. The bowl is 

 subcylindrical for 0.74 total length. The aboral region is 

 subcorneal (52 in the upper seven-tenths and 112 in the 

 remainder), with distinct angles at the levels of change, and 

 with a sharply pointed aboral end. 



The wall is thickest suborally, where it is almost 0.09 oral 

 diameter; it gradually thins down distally. There are thin 

 laminae which enclose hyaline material. 



Length, 145 to 205U;. 



Undella parva has an angular aboral end and point, un- 

 like U. hyalina, and differs in these respects also from U. 

 declivis, in which the aboral end is broader and the whole 

 lorica generally shorter. It is stouter than U. attenuata, and 

 is not saccular aborally as is U . dilatata. 



Recorded from fourteen stations, three in the Atlantic and 

 eleven in the Pacific, as follows: three (17, 18, 19) in the 

 Sargasso Sea, three (46, 47, 80) in the Galapagos region, two 

 (109, 138) in the North Pacific trade region, and six (132, 

 133, 135, 136, 145, 146) in the California region. 



There are 5 pump and 15 net samples, of which 1 was 

 taken at the surface, 9 at 50 meters, and 10 at 100 meters. 

 Maximum frequency, 8 per cent at stations 17, 109; other 

 records above minimum (2 to 6 per cent) from stations 18, 

 19, 46, 136, 145; averages in net samples, 5 and 2.8 per cent 

 in the Atlantic and Pacific, respectively; in pump samples 

 there were 1 to 3 loricae, average 2.5. 



Temperature: Atlantic, net samples i9?82-25?3i (22?3o); 

 Pacific, pump samples i8?5i-i8?95 (18^67), net samples 

 i8?87-26?o6 (22?3o). Salinity: Atlantic, net samples 36.60- 

 37.15 (36.84); Pacific, pump samples 33.89-35.02 (34.63), 

 net samples 34.32-35.96 (35.02). Density: Atlantic, net 

 samples 24.89-26.05 (25.55); Pacific, pump samples 24.35- 

 25.09 (24.84), net samples 22.89-25.09 (24.16). pH: At- 

 lantic, net samples 8.23-8.27 (8.25); Pacific, pump samples 

 8.31-8.39 (8.34), net samples 8.16-8.39 (8.26). 



Undella peruana Kofoid and Campbell 

 Undella peruana Kofoid and Campbell, 1929, p. 265, fig. 509. 



The rather elongated lorica, with decided aboral expansion 

 and angularity, has a length of 4.25 oral diameters. The oral 

 rim is sharp. The bowl forms a cylinder with a length of 0.6 

 total length, then becomes flanged (43°) for about 0.1, con- 

 tracted subconical (20 ) for 0.24, and then inverted conical 

 (93°) for less than 0.06 total length. The angles at the levels 

 of change are marked. The aboral end is obtusely pointed. 



The wall is subuniformly 0.09 oral diameter in thickness 

 in the cylinder, 0.13 in the upper bowl, and much thinner 

 (0.05) aborally. The laminae enclose homogeneous material. 



Length, 163 to 215(1. 



Undella peruana has a flange, and also is more sharply 

 angular than U . attenuata. 



