104 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



tracts (30 anteriorly reaching 95 aborally) as a convex 

 cone. The aboral end is pointed. 



The wall thickness reaches 0.15 oral diameter at the lower 

 end of the inner collar; it is a third as much in the bowl. 

 The inner collar is wide, conical (40 ), and 0.25 oral diam- 

 eter in length, and the diameter at the lower end is 0.75 oral 

 diameter. There are thin laminae with enclosed hyaline 

 material. 



Length, 55 to 70^. 



Proplectella ellipsoida is aborally pointed unlike P. tutnida 

 and P. praelonga, lacks the lateral angularity of P. sub- 

 angulata, and is longer than P. subacuta, shorter than P. 

 ostenfeldi, plumper and smaller than P. grandis, and wider 

 aborally than P. cuspidata. 



Recorded from twenty stations, eight in the Atlantic and 

 twelve in the Pacific, as follows: one (16) in the Gulf 

 Stream, two (19, 21) in the Sargasso Sea, four (23, 27, 29, 

 30) in the Atlantic equatorial region, one (34) in the Carib- 

 bean sea, four (41, 45, 46, 68) in the Galapagos region, five 

 (55, 62-63, 64, 65, 67) in the South Pacific middle latitudes, 

 two (136, 147) in the California region, and one (145) in 

 the North Pacific middle latitudes. 



There are 23 net samples, of which 4 were taken at the 

 surface, 7 at 50 meters, 11 at 100 meters, and 1 at 1000 

 meters. Maximum frequency, 1=5 per cent at station 65; 

 other records above minimum (2 to 10 per cent) from 

 stations 19, 23, 27, 29, 45, 64, 67, 136, 145, 147; averages, 1.7 

 and 4.1 per cent in the Atlantic and Pacific, respectively. 



Temperature: Atlantic, 22?42-2~?42 (24?67); Pacific, 

 3? 98-23 ^30 (i9?27). Salinity: Atlantic, 36.02-37.05 (36.39); 

 Pacific, 34.19-35.32 (35.04). Density: Atlantic, 23.26-25.67 

 (24.55); Pacific, 24.06-27.25 (25.00). pH: Atlantic, 8.18- 

 8.30 (8.24); Pacific, 7.76-8.39 (8.08). 



Proplectella expolita Hada 

 Proplectella expolita Hacla, 1932&, pp. 568-569, fig. 22. 



The fairly short lorica is bottle-like and has a length of 

 2.00 to 2.58 oral diameters. The oral margin is sharp. The 

 upper bowl is subcylindrical, 0.3 to 0.33 total length in 

 length; it is angular in the suboral three-tenths. The lower 

 bowl is spheroidal to ovate, and 1.5 to 2.0 oral diameters in 

 diameter near the middle. The aboral end is widely rounded. 



The wall reaches 0.15 oral diameter in thickness near the 

 lower end of the upper bowl and is half as much aborally. 

 The laminae are relatively thick and enclose hyaline material. 

 The inner collar is cylindrical and has the same length as 

 the upper bowl. 



Length, 56 to 761.1. 



Proplectella expolita differs from other species of the genus 

 in having a distinct cylindrical upper bowl. It resembles 

 Undella californiensis in general form, but has a thicker wall 

 at the base of the upper bowl. 



Recorded from one station (116) in the North Pacific 

 middle latitudes, in a net sample taken at 50 meters. Fre- 

 quency, 2 per cent. 



Temperature, n? 18; salinity, 33.79; density, 25.83; pH, 

 8.11. 



Proplectella fastigata (Jorgensen) Kofoid and Campbell 



(Figures 80, 96) 

 Proplectella fasti 'gata, Kofoid and Campbell, 1929, p. 278, fig. 528. 



The short, stout, ovate lorica, with thick wall, has a length 

 of 1.94 oral diameters. The oral margin is rounded and thin. 

 The upper 0.29 total length is conical (80°), the middle 0.49 

 tapers (23 ), and the aboral region rounds off. The junc- 

 tions between these sections are all rounded, the lowermost 

 more than the upper. The aboral end is unmodified. 



The wall reaches a thickness of almost 0.19 oral diameter 

 in the upper section, but is reduced to a third as much lower 

 down. The inner collar is funnel-shaped (20 ) and almost 

 0.3 oral diameter in length. The laminae are rather thick. 



Length, 69 to 82^1. 



Proplectella fastigata has a thicker collar wall than does 

 P. claparedei, has less aboral expansion than P. perpusilla, 

 and is stouter than P. tenuis. It is not so long or so wide as 

 P. ovata, and its aboral end is different. 



Recorded from fifteen stations, fourteen in the Atlantic 

 and one in the Pacific, as follows: three (3, 4, 5) in the 

 Atlantic drift, two (14, 16) in the Gulf Stream, four (17, 19, 

 20, 20-21) in the Sargasso Sea, five (22, 23, 24, 27, 28) in the 

 Atlantic equatorial region, and one (65) in the South Pacific 

 middle latitudes. 



There are 19 net samples, of which 2 were taken at the 

 surface, 7 at 50 meters, and 10 at 100 meters. Frequency, 9 

 per cent at station 17; other records above minimum (2 to 6 

 per cent) from stations 3, 4, 14, 19, 20, 22, 23, 24, 27; average 

 in the Atlantic, 3 per cent. 



Temperature: Atlantic, i4?02-26?79 (i9?45); Pacific, 

 I5?03. Salinity: Atlantic, 35.59-37.15 (36-19); Pacific, 34.30. 

 Density: Atlantic, 23.79-27.01 (25.72); Pacific, 25.44. pH: 

 Atlantic, 7.96-8.27 (8.17); Pacific, 8.10. 



Proplectella globosa (Brandt) Kofoid and Campbell 

 (Figures 95, 100) 



Proplectella globosa, Kofoid and Campbell, 1929, pp. 278-279, 

 fig- 541- 



The small, globular lorica has a length of 1.6 oral diam- 

 eters. The oral margin is sharp. The globose, convex bowl 

 expands (40 ) to a diameter of 1.55 oral diameters at 0.43 

 total length, and then contracts ( 36 anteriorly, increasing to 

 105 and later to 145 ). The whole is distinctly convex. 

 The aboral end is obscurely obtuse. 



The wall reaches 0.27 oral diameter in thickness in the 

 .nner collar; it is gradually reduced to a minimum at the 

 aboral end (0.07). There are thin laminae and enclosed 

 homogeneous material. The inner collar is contracted (30 ), 

 the length being 0.17 oral diameter, and the diameter at the 

 aboral end is 0.83 oral diameter. 



Length, 62 to 9511. 



The loricae of this expedition show considerable diversity. 

 Some (fig. 100) are laterally compressed and narrow, and 

 others (fig. 95) are rotund. The former suggest some loricae 

 of P. tenuis, the others P. claparedei. Proplectella globosa is 

 much more rotund, in general, than either P. claparedei or 

 P. ovata, and is much less angular. 



