TAXONOMY AND DISTRIBUTION 



103 



conical section (78°) has a length of 0.33 total length and a 

 diameter at the lower end of 2.63 oral diameters. The middle 

 0.33 is cylindrical. The aboral 0.33 is again conical (75°), 

 and the aboral end tends to be flattened (0.53 oral diameter). 



The inner collar is cylindrical, nearly 0.52 oral diameter 

 in length. The wall otherwise follows the outer contour; its 

 maximum thickness is nearly 0.5 oral diameter, but it is 

 quickly reduced to o.r in the middle and aboral sections. 

 There are rather thick laminae and enclosed hyahne sub- 

 stance. 



Length, 82|.i. 



The Carnegie loricae are longer (82 as against 62 to 68^) 

 and more sharply angular than those previously reported. 



Proplectella biangulata resembles P. subangulata in angu- 

 larity and subdivisions. It difTers, however, in the cylindrical 

 rather than tapering middle section, and equality of cones. 

 It differs from P. amplwra in having three instead of two 

 subdivisions. 



Recorded from one station (64) in the South Pacific middle 

 latitudes, in a net sample taken at the surface. Frequency, 

 minimum. 



Temperature, 20?6i; salinity, 34.62; density, 24.33; pH, 

 8.12. 



Proplectella claparedei (Entz, Sr.) Kofoid and Campbell 

 Proplectella claparedei, Kcifoid and Campbell, 1929, p. 27^1, fig. 



The moderate-sized lorica, with general ovoid shape, has 

 a length of 1.64 oral diameters. The oral margin is sharp. 

 The bowl expands (32°) for nearly 0.45 total length, and 

 reaches 1.32 oral diameters; it then contracts {26° in the 

 anterior section, then 70°, and finally 132°). The aboral end 

 is smoothly rounded. 



The wall reaches a thickness of o.i oral diameter in the 

 inner collar and decreases to 0.5 that amount aborally. The 

 inner collar is funnel-like (42°) and only o.i oral diameter 

 in length; its diameter at the lower end is 0.87 oral diameter. 

 There are thin laminae with enclosed homogeneous material. 



Length, 58 to 64IX. 



Some loricae are egg-shaped. 



Proplectella claparedei has a rounded aboral end, unlike 

 P. globosa or P. tenuis. The aperture is wider than that of 

 P. tumida or P. praelonga. 



Recorded from thirty-seven stations, eleven in the Atlantic 

 and twenty-six in the Pacific, as follows: one (3) in the 

 Atlantic drift, three (18, ig, 20) in the Sargasso Sea, six (24, 

 25, 26, 27, 28, 30) in the Atlantic equatorial region, one (31 ) 

 in the Caribbean Sea, two (39, 152) in the Pacific equatorial 

 region, nine (41, 44, 45, 46, 47, 73, 77, 78, 80) in the Gala- 

 pagos region, one (51) in the South Pacific middle latitudes, 

 five (81, 93, 96, 157, 160) in the region of South Pacific 

 island fields, one (117) in the North Pacific middle latitudes, 

 one {118) in the East Asiatic marginal sea, six (130, 133, 

 137, 147, 148, 149) in the California region, and one (138) 

 in the North Pacific trade region. 



There are 23 pump and 24 net samples, of which 10 were 

 taken at the surface, 19 at 50 meters, and 18 at 100 meters. 



Maximum frequency, 10 per cent at station 130; other records 

 above minimum (2 to 5 per cent) from stations 3, 18, 19, 20, 

 25, 27, 77, 78, 149, i5o; averages in net samples, 2.3 and 2.4 

 per cent in the Atlantic and Pacific, respectively; in pump 

 samples there were i to 8 loricae, averages 3.5 and 1.6, re- 

 spectively. 



Temperature: Atlantic, pumpsamples i4?6o-27?6i (2i?96), 

 net samples i4?6q-27?88 (2i?75); Pacific, 8?96-28?57 

 (2i?93) and io?i8-26?05 (i9?94), respectively. Salinity: 

 Atlantic, pump samples 35-70-37.15 (36.42), net samples 

 35.61-37.15 (36.34); Pacific, 33.61-35.99 (34.98) and 33.40- 

 36.04 (35.10), respectively. Density: Atlantic, pump samples 

 23.32-26.62 (25.22), net samples 23.28-26.95 (25.23); Pacific, 

 21.95-26.50 (24.63) and 22.65-26.14 (24.03), respectively. 

 pH: Atlantic, pump samples 7.93-8.30 (8.17), net samples 

 7.93-8.30 (8.27); Pacific, 7.76-8.47 (8.16) and 8.06-8.38 

 ( 8.21 ), respectively. 



Proplectella cuspidata Kofoid and Campbell 



(Figure 106) 



Proplectella cuspidata Kofoid and Campbell, 1929, p. 277, fig. 

 540. 



The fairly short lorica is slender conical and has a length 

 of 3.2 oral diameters. The oral margin is rounded. The 

 bowl is subcylindrical in the anterior 0.52. The lower bowl 

 is slightly convex conical (35°). The aboral end is sharply 

 pointed but not prolonged. 



The wall IS thickest suborally, where it reaches almost 

 0.09 oral diameter; it gradually thins aborally. There are 

 extremely thin laminae and enclosed hyaline material. 



Length, 80 to io6[.i. 



Proplectella cuspidata is more slender than P. grandis, as 

 well as less convex. It is larger and more convex than P. 

 parva; the latter is more like P. subcaudata. 



Recorded from eight stations in the Pacific, as follows: 

 two (35, 37) in the Pacific equatorial region, four (41, 42, 

 68, 75) in the Galapagos region, and two (65, 67) in the 

 South Pacific middle latitudes. 



There are i pump and 8 net samples, of which 2 were 

 taken at 50 meters and 7 at 100 meters. Frequency, 4 per 

 cent at stations 41, 75; other records above minimum (2 per 

 cent) from stations 35, 42; average in net samples, 2.3 

 per cent. 



Temperature: pump sample i9?82, net samples i4?33- 

 i8?40 (i5?74). Salinity: pump sample 34.53, net samples 

 :;4. 30-35.47 (34.78). Density: pump sample 24.47, ^^^ 

 samples 25.44-26.17 (25.73). pH: pump sample 8.00, net 

 samples 7.88-8.13 (8.00). 



Proplectella ellipsoida Kofoid and Campbell 

 (Figure 93) 



Proplectella ellipsoida Kofoid and Campbell, 1929, p. 277, fig. 

 538. 



The fairly short, elliptical lorica has a length of 1.65 oral 

 diameters. The oral margin is sharp. The bowl expands 

 (42°) for 0.37 total length, to 1.35 oral diameters, then con- 



