96 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Length, 55 to yi[i. 



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

 portionately more slender, with greater median expansion. 

 It is not so slender as U . hyalinella and lacks the suboral 

 contraction and the angles of that species. 



Recorded from one station (63) in the South Pacific 

 middle latitudes, in a pump sample taken at 100 meters. 

 Frequency, 5 loricae. 



Temperature, i5?84; salinity, 34.58; density, 25.48; pH, 

 8.08. 



Undella declivis Kofoid and Campbell 



(Figure 108) 



Undella declivis Kofoid and Campbell, 1929, pp. 261-262, fig. 

 507. 



The fairly stout, moderately large lorica, of parva-\[V.t form 

 but with cylindrical upper bowl, has a length of 2.66 oral 

 diameters. The oral rim is sharp. The upper bowl (0.67 

 total length) is distinctly cylindrical. The lower bowl is bi- 

 angular (30° in the upper four-fifths and 125° in the lower 

 section). The aboral end is pointed. 



The wall is subuniformly 0.09 oral diameter in thickness 

 in the upper angular section, and thinner above and below. 

 There are thin laminae which enclose finely alveolar material. 



Length, 138 to 178^. 



The lorica figured (fig. 108) is not typical, although 

 assigned to this species. 



Undella declivis resembles U. parva, but is shorter and 

 stouter, with cylindrical rather than tapering upper bowl. 

 Undella dilatata is saccular aborally, with some lateral con- 

 cavity. 



Recorded from six stations, two in the Atlantic and four 

 in the Pacific, as follows: one (19) in the Sargasso Sea, one 

 (23) in the Atlantic equatorial region, one (80) in the Gala- 

 pagos region, two (109, 151) in the North Pacific trade 

 region, and one (146) in the California region. 



There are 3 pump and 4 net samples, of which 4 were 

 taken at 50 meters and 3 at 100 meters. Maximum fre- 

 quency, 20 per cent at station 23; 2 per cent each at stations 

 109, 146; average in Atlantic net samples, 1.7 per cent. 



Temperature: Atlantic, net samples 2o?99-25?3i (23? 15); 

 Pacific, net sample i9?8i, pump samples i8?28-23?58 

 (2i?74). Salinity: Atlantic, net samples 36.02-37.15 (36.40); 

 Pacific, net sample 34.86, pump samples 34.42-36.21 (35.18). 

 Density: Atlantic, net samples 24.89-25.30 (25.09); Pacific, 

 net sample 24.72, pump samples 24.07-24.77 (24.51). pH: 

 Atlantic, net samples 8.14-8.27 (8.19); Pacific, net sample 

 8.18, pump samples 8.18-8.30 (8.24). 



Undella dilatata Kofoid and Campbell 



Undella dilatata Kofoid and Campbell, 1929, p. 262, fig. 499. 

 Undella dohrni, Alzamora, 1929, p. 8, fig. 16. 



The relatively stout, moderate-sized lorica, with saccular 

 aboral region, has a length of 2.68 oral diameters. The oral 

 rim is thin. The upper bowl forms an expanding, slighdy 

 concave cone (8°), with a length of 0.53 total length, then 



swells evenly to 1.35 oral diameters at 0.73 total length from 

 the rim. Below this level the lower bowl rounds broadly to 

 the acutely pointed (125°) aboral end, which is also barely 

 mammillate. 



The wall is o.i oral diameter in thickness in the upper 

 bowl, 0.15 in the bulge, and 0.05 aborally. There are thin 

 laminae and homogeneous enclosed material. I 



Length, 130 to i6o|.i. 



Undella dilatata differs from U . dohrni in the greater 

 width of the upper bowl, the less extensive swollen region, 

 and the character of the aboral end. It lacks the squared-off 

 aboral end of U. pistillum. 



Recorded from two stations (25, 26) in the Atlantic equa- 

 torial region. 



There are i pump and i net sample, taken at 50 and 100 

 meters, respectively. Frequency, net sample, 10 per cent; 

 pump sample, i lorica. 



Temperature: pump sample 24? 10, net sample i4?6o. 

 Salinity: pump sample 36.14, net sample 35.70. Density: 

 pump sample 24.49, net sample 26.62. pH: pump sample 

 8.21, net sample 7.93. J 



Undella hawaiensis, new species 

 (Plate I, figure 7) 



The tall, cylindrical lorica, with narrowed posterior region 

 and blunt aboral end, has a length of 5.98 oral diameters. 

 The oral margin is even, inturned, thin, and not especially 

 differentiated. Immediately below the rim is a very narrow 

 region 0.2 oral diameter in width. This section is a low 

 basal segment of a cone (55°), and there is a barely visible 

 submedian constriction about it, although the sides are quite 

 full. The diameter at the lower level of this cone is 1.16 

 oral diameters. The remaining part of the bowl may be 

 subdivided into four sections. The first of these segments 

 is a long cylinder of uniform diameter, with a length of 0.57 

 total length. Its sides are even, regular, and singularly free 

 of local modification. The second subdivision is an inverted 

 truncated cone (23°). Its length is 0.21 total length, and its 

 diameter at the truncated aboral end is 0.72 oral diameter. 

 The sides are flattened, and again without trace of irregu- 

 larity. This cone is asymmetrical, with one of the sides 

 somewhat higher than the other. The third subdivision is a 

 short cylinder. Its upper end is continuous with the lower 

 end of the cone above it, and it maintains approximately the 

 same diameter throughout its length, which is more than o.i 

 total length. Its sides are flattened and lack irregularity. 

 The last of the subdivisions forms the aboral cone. This is 

 a short, blunt, wide, inverted cone (70°). Its length is only 

 0.52 oral diameter. Its sides are broad arcs, and its tip is 

 pointed and opens to the outside by means of a minute pore.- 

 The lateral contour of the bowl as a whole is, as may be 

 judged from the above description, sinuous, and the changes 

 from one subdivision to the other give it a hollow-sided, 

 almost concave general appearance. 



The wall is subuniformly thin at all levels, being about 

 0.02 oral diameter, or less, in thickness. Laminae and other 

 wall structure appear to be lacking in the glass-clear lorica. 



