TAXONOMY AND DISTRIBUTION 



125 



Eutintinnus tubiformis Kofoid and Campbell 



Tintiiunis tiihijonnis Kofoid and Campbell, 1929, p. 340, fig, 

 654. 



The tall, stout lorica, with abrupt suboral and aboral flares 

 and dense, rugose wall, has a length of 3.64 oral diameters. 

 The oral margin is thick but nearly brimless. There is wide 

 suboral flare (42°) within the anterior o.i oral diameter. 

 The shaft tapers slightly (2°) without local modification, the 

 diameter being nearly 0.58 oral diameter just above the 

 aboral flare. The aboral flare (60°) is within o.i oral diam- 

 eter, and the brimless aboral end has a diameter of 0.6:5 oral 

 diameter. 



The wall is dense but thin (0.02 oral diameter). Its sur- 

 face has short, linear, irregular rugae. 



Length, 323 to 4141-1. 



Eutintinnus tubiformis has no oral teeth, but does have 

 suboral flare, unlike E. rugosus, which latter species is also 

 shorter (275J.1). It is unique and not likely to be confused 

 with others. 



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

 (81, 84) in the region of South Pacific island fields, one 

 (105) in the North Pacific trade region, one (146) in the 

 California region, and one (156) in the Pacific equatorial 

 region. 



There arc i pump and 4 net samples, of which i was 

 taken at the surface and 2 each at 50 and 100 meters. Fre- 

 quency, 8 per cent at station 81; other records above mini- 

 mum (2 to 4 per cent) from stations 105, 156; average in net 

 samples, 4.3 per cent. 



Temperature: pump sample 26?9i, net samples 20?07- 

 27^52 (25?i5). Salinity: pump sample 34.92, net samples 

 34.32-36.42 (35.41). Density: pump sample 22.71, net 

 samples 22.90-24.24 (23.58). pH: pump sample 8.23, net 

 samples 8.19-8.34 (8.22). 



Eutintinnus tubulosus (Ostenfeld) Kofoid and Campbell 



Tintiiiiius ttihiilosiis, Kofoid and Campbell, 1929, pp. 340-341, 



fig. 651. 

 Tintinnus histisundac, Hofkcr, 1931, p. 387, fig. 84 (see also 



E. lusus-undac) . 



The short, contracted, tubular lorica, with almost no brim, 

 has a length of 2.72 oral diameters. The oral margin is thin 

 and is surrounded by a weak sort of molding which forms a 

 slight brim. The shaft tapers (5°) uniformly to the simple, 

 rimless aboral end, the diameter of which is 0.75 oral diam- 

 eter. 



The wall is almost transparent and of exceeding thinness. 



Length, iii|.i. 



For an account of the complex history of this species see 

 Kofoid and Campbell (1929). 



Eutintinnus tubulosus differs from E. perminutus in lack 

 of suboral flare, smaller size, and less stout proportions. It is 

 much shorter than E. lusus-undae, and not so stout; it is not 

 so contracted as E. stramentiis . 



Recorded from six stations, three each in the Atlantic and 

 the Pacific, as follows: two (3. 3-4) in the Atlantic drift, one 

 (22) in the Atlantic equatorial region, one (72) in the CJala- 



pagos region, one (128) in the North Pacific middle lati- 

 tudes, and one (130) in the California region. 



There are 4 pump and 5 net samples, of which 4 were 

 taken at the surface, 3 at 50 meters, and 2 at 100 meters. 

 Maximum frequency, 4 per cent at station 3; 2 per cent at 

 station 3-4; other records minimum; average in net samples, 

 2 per cent. 



Temperature: Atlantic, net samples i3?52-i7?34 (i5?i7); 

 Pacific, pump samples ii?88-24?93 (i8?05). Salinity: At- 

 lantic, net samples 35.85-36.10 (35.99); Pacific, pump samples 

 33.07-35.40 (34.30). Density: Atlantic, net samples 26.29- 

 26.96 (26.68); Pacific, pump samples 23.64-25.30 (24.63). 

 pH: Atlantic, net samples 7.99-8.19 (8.10); Pacific, pump 

 samples 8.11-8.34 (8- 18). 



Eutintinnus turgescens Kofoid and Campbell 



Tintinnus turgescens Kofoid and Campbell, 1929, p. 341, fig. 

 650. 



The moderately tall lorica, with brim, suboral flare, and 

 median expansion, has a length of 4.0 oral diameters. The 

 oral opening has a thin, molded brim. The shaft flares (34°) 

 within its upper tenth, the lower end of the flaring section 

 having a diameter of 0.75 oral diameter. The shaft slowly 

 swells from the neck to a diameter of 0.81 oral diameter near 

 0.47 total length below the brim, and then contracts with 

 equal slowness to the simple, rimless aboral end, the diam- 

 eter of which is 0.62 oral diameter. 



The wall is hyaline and uniformly 0.02 oral diameter in 

 thickness. 



Length, 155 to 193(1. 



Eutintinnus turgescens swells in the mid-region, unlike 

 E. lusus-undae, which it otherwise resembles. It is stouter 

 than E. tenuis and has a bulge. 



Recorded from nineteen stations, six in the Atlantic and 

 thirteen in the Pacific, as follows: one (14) in the Gulf 

 Stream, four (22, 23, 24, 27) in the Atlantic equatorial 

 region, one (34) in the Caribbean Sea, three (44, 46, 77) in 

 the Gal.apagos region, one (54) in the South Pacific middle 

 latitudes, one (86) in the region of South Pacific island 

 fields, one (109) in the North Pacific trade region, three 

 (132, 134, 135) in the California region, two (142, 145) in 

 the North Pacific middle latitudes, and two (153, 155) in the 

 Pacific equatorial region. 



There are 9 pump and n net samples, of which 6 were 

 taken at the surface, 11 at 50 meters, and 3 at 100 meters. 

 Maximum frequency, 6 per cent at station 153; other records 

 above minimum (2 to 4 per cent) from stations 14, 34, 46, 

 77, 86; average in net samples, 1.6 and 3.7 per cent in the 

 Atlantic and Pacific, respectively; in pump samples there 

 were i to 7 loricae, average 2.2. 



Temperature: Atlantic, net samples i7?50-26?04 (22?3o); 

 Pacific, pump samples i6?90-27?5i (2i?82), net samples 

 i9?i6-27?7i (23?3i). Salinity: Atlantic, net samples 35.23- 

 36.53 (36.01); Pacific, pump samples 33.89-36.20 (35.52), 

 net samples 34.32-36.04 (35.07). Density: Atlantic, net 

 samples 23.98-25.30 (24.62); Pacific, pump samples 23.48- 

 25.15 (24.18), net samples 22.46-24.53 (23.86). pH: At- 



