io8 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



There are 5 pump and 9 net samples, of which i was 

 taken at the surface, 3 at 50 meters, and 10 at 100 meters. 

 Maximum frequency, 8 per cent at station 64; other records 

 above minimum (2 to 4 per cent) from stations 14, 42, 63; 

 average in Atlantic net samples, 2 per cent. 



Temperature: Atlantic, pump sample 26T04, net samples 

 i4?02-36?02 (2i?04); Pacific, i5?q3-i6?96 (i5?93) and 

 i4?33-i9?8i (i7?07), respectively. Salinity: Atlantic, pump 

 sample 36.25, net samples 35.59-36.73 (36.02); Pacific. 34.30- 

 34.58 (34.44) and 34.86-35.04 (34.95), respectively. Density: 

 Adantic, pump sample 23.98, net samples 25.30-26.66 

 (26.00); Pacific, 25.14-25.48 (25.37) and 24.72-26.17 (25.44), 

 respectively. pH: Adantic, pump sample 8.30, net samples 

 7.93-8.19 (8.10); Pacific, 8.08-8.10 (8.09) and 7.91-8. 18 

 (8.04), respectively. 



Proplectella tenuis Kofoid and Campbell 



(Figure 94) 



Proplectella tenuis Kofoid and Campbell, 1929, pp. 283-:;S4, 

 fig. 536; Marshall, 1934, p. 653, fig. 33. 



The moderate-sized lorica, with wide aboral region and 

 general rotundity, has a length of 1.78 oral diameters. The 

 oral margin is sharp. The globose bowl expands (50°) in 

 the anterior half, where the bowl reaches 1.67 oral diameters, 

 and then it contracts (22°, increasing to 89°, and finally to 

 148°). The aboral end is widely and obtusely pointed. 



The wall reaches 0.28 oral diameter in thickness in the 

 inner collar, but is reduced in the bowl to one-fourth as 

 much, or less, aborally. The inner collar is funnel-like 

 (24°), and the diameter at the lower end is 0.83 oral diam- 

 eter. The laminae are thin and there is a faint prismatic 

 structure. 



Length, 63 to 761.1. 



The Carnegie loricae are not much like either of those 

 recorded by others. The lorica figured by Marshall is fiatter- 

 sided than that of the earlier authors, and the Carnegie speci- 

 mens (fig. 94) are more globose than either. 



Proplectella tenuis is less pointed and has a more ffaring 

 collar than P. ostenjeldi, and differs from P. ellipsoida in 

 being wider aborally. It is longer than P. globosa. 



Recorded from sixteen stations, three in the Adantic and 

 thirteen in the Pacific, as follows: one (18) in the Sargasso 

 Sea, two (23, 24) in the Adantic equatorial region, two (41, 

 45) in the Galapagos region, two (63, 64) in the South 

 Pacific middle latitudes, four (139, 140, 150, 151) in the 

 North Pacific trade region, two (142, 145) in the North 

 Pacific middle latitudes, and three (146, 147, 148) in the 

 California region. 



There are 19 pump and 5 net samples, of which 3 were 

 taken at the surface, 8 at 50 meters, 12 at 100 meters, and i 

 at 150 meters. Maximum frequency, 11 per cent at station 

 23; average in Atlantic net samples, 7.6 per cent. 



Temperature: Atlantic, net samples i5?55-22?i2 (i9?55); 

 Pacific, net sample 21^69, pump samples i4?55-26?72 

 (23?i2). Salinity: Adantic, net samples 35.61-36.82 (36.14); 

 Pacific, net sample 35.21, pump samples 34.27-35.18 (34.82). 

 Density: Adantic, net samples 25.30-26.34 (25.74); Pacific, 



net sample 24.48, pump samples 22.80-26.11 (24.37). V^- 

 Atlantic, net samples 7.96-8.24 (8.13); Pacific, net sample 

 8.12, pump samples 7.92-8.34 (8.31). 



Proplectella tumida Kofoid and Campbell 

 Proplectella tumida Kofoid and Campbell, 1929, p. 284, fig. 526. 



The fairly small, bottle-shaped lorica has a length of 2.54 

 oral diameters. The oral margin is thinly rounded. The 

 generally ovate bowl expands (30°) to 1.76 oral diameters at 

 0.53 total length below the rim, then contracts in a rather 

 narrow ellipse (35°, increasing to 89°) to the rounded aboral 

 end. 



The wall hardly reaches o.i oral diameter in thickness at 

 the inner collar. The inner collar is ill defined; it is o.i oral 

 diameter in length, and the diameter at the lower end is 0.85 

 oral diameter. The laminae are extremely thin, and enclose 

 hyaline material. 



Length, 60 to 6i|^t. 



Proplectella tumida is rather like P. praelonga, but has an 

 ill defined anterior extension, and a thinner wall in the 

 inner collar. It is also shorter. It is only vaguely like P. 

 claparedei. 



Recorded from four stations, one in the Atlantic and three 

 in the Pacific, as follows: one (18) in the Sargasso Sea, and 

 three (51, 54, 65) in the South Pacific middle latitudes. 



There are 2 pump and 2 net samples, all taken at loo 

 meters. Frequency, 4 per cent at station 54; other records 

 2 to 3 per cent. 



Temperature: Atlantic, net sample 20?32; Pacific, pump 

 samples i5?03-20?o7 (i7?55), net sample i8?74. Salinity: 

 .■\tlantic, net sample 36.81; Pacific, pump samples 34.30- 

 35.62 (34.96), net sample 35.35. Density: Atlantic, net sample 

 26.07; Pacific, pump samples 25.24-25.44 (25.34), f^t sample 

 26.07. pH: Atlantic, net sample 8.21; Pacific, pump samples 

 8.10-8.22 ( S.16), net sample 8.16. 



Proplectella urna Kofoid and Campbell 

 Proplectella urna Kofoid and Campbell, 1929, p. 2(S4, fig. 533. 



The small lorica, of urnlike form, has a length of 4.4 oral 

 diameters. The oral margin is thin and sharp. The bowl 

 expands (48°) to a diameter of 2.46 oral diameters at 0.44 

 total length below the rim, continues with a subcylindrical 

 section, and then contracts (97°) to the distinctly pointed 

 aboral end. 



The wall reaches the extraordinary thickness of 0.23 oral 

 diameter at the base of the inner collar. The inner collar 

 occupies the upper 0.12 total length and its inside face is 

 practically upright. There are e.xceedingly thin laminae and 

 homogeneous enclosed material. 



Length, 46 to 48JI. 



Proplectella urna bears a litde likeness to P. tumida, but 

 is pointed instead of rounded; also, it is expanded more 

 anteriorly. 



Recorded from one station (67) in the South Pacific 

 middle latitudes, in a net sample taken at 100 meters. Fre- 

 quency, minimum. 



