TAXONOMY AND DISTRIBUTION 



121 



lacking in jial{n6ii; the latter has aboral flare lacking in 

 E. lusus-tindac. 



Recorded from titty-nine stations, nineteen in the Atlantic 

 and forty in the Pacific, as follows: three (2, 14, 16) in the 

 Gulf Stream, one (3) in the Atlantic drift, five (17, 18, 19, 

 20, 21) in the Sargasso Sea, eight (22, 23, 24, 25, 26, 28, 29, 

 30) in the Atlantic equatorial region, two (33, 34) in the 

 Caribbean Sea, four (35, 35-36, 37, 99) in the Pacific equa- 

 torial region, nine (40, 44, 45, 68, 71, 72, 75, 77, 78) in the 

 Galapagos region, three (49, 90, 93) in the region of South 

 Pacific island fields, nine (50, 52, 54, 59, 61, 62-63, 63, 64, 

 65) in the South Pacific middle latitudes, nine (100, loi, 

 102, 104, 105, 106, 140, 150, 151) in the North Pacific trade 

 region, two ( it2, 145) in the North Pacific middle latitudes, 

 and four (132, 133, 148, 149) in the California region. Like 

 Eiitintiiiniis lusus-undae, this species is seldom excluded in 

 warm or temperate seas. 



There are 48 pump and 39 net samples, of which 43 were 

 taken at the surface, 26 at 50 meters, and 18 at 100 meters. 

 This species progressively diminishes in deeper levels. Maxi- 

 mum frequency, 24 per cent at station 61; other records 

 above minimum (2 to 20 per cent) from stations 2, 14, 17, 

 18, 20, 35, 35-36, 45, 59, 62-63, 65, 68, 71, 77, 78, 145; aver- 

 ages, 1.4 and 5.8 per cent in Atlantic and Pacific net samples, 

 respectively; in pump samples there were i to 7 loricae. 



Temperature: Atlantic, pump samples i7?5o-28?57(25?52), 

 net samples i4?6o-27?88 (22?09); Pacific, i6?33-27?84 

 (23^05) and io?g2-24'?93 (i8?87), respectively. Salinity: 

 Atlantic, pump samples 35.22-37.00 (36.10), net samples 

 35.23-37.18 (36.39); Pacific, 31.68-36.17 (35.81) and 33.97- 

 36.04 (34.83), respectively. Density: Atlantic, pump samples 

 22.73-25.38 (23.84), net samples 23.26-26.81 (25.22); Pacific, 

 20.20-24.96 (23.75) and 23.64-26.06 (25.00), respectively. 

 pH: Atlantic, pump samples 8.18-8.32 (8.25), net samples 

 7.93-8.37 (8.20); Pacific, 8.04-8.42 (8.21) and 7.87-8.34 

 (8.05), respectively. 



Eutintinnus latus (Jorgensen) Kofoid and Campbell 

 Tintiiinus latus. Kofoid and Campbell, 1929, p. 334, fig. 636. 



The large, stout lorica, with flaring suboral and aboral 

 ends and median swelling, has a length of 4.92 oral diam- 

 eters. The thin oral margin has a narrow, molded brim. 

 The suboral flare (12°) extends nearly 0.27 total length; the 

 diameter of the shaft at its lower end is 0.73 oral diameter. 

 Below this level the shaft swells regularly and gradually, 

 reaching 0.8 oral diameter near 0.57 total length from the 

 brim. The swollen region occupies a band approximately 

 0.47 total length. Below its lower end the shaft continues 

 for almost 0.23 total length, the diameter at the lower end 

 being about 0.67 oral diameter. The aboral end flares (28°) 

 within 0.4 oral diameter. There is no aboral l^rim, and the 

 diameter reaches 0.8 oral diameter. 



The wall is hyaline and thin (o.oi oral diameter). 



Length, 355 to 40411. 



Eutintinnus liitus resembles E. medius in general shape, 

 but is much broader and longer. It may be only a form of 

 the other, developed under special physical conditions. 



Recorded from two stations in the Atlantic, as follows: 

 one (30) in the Atlantic equatorial region, and one (31) in 

 the Caribbean Sea. 



There are 3 net samples, of which i was taken at 50 

 meters and 2 at 100 meters. Frequency, minimum. 



Temperature, 22?56-27?88 (25?32); salinity, 36.08-36.51 

 (36.33); density, 23.26-25.22 (24.24); pH, 8.19-8.30 (8.25). 



Eutintinnus lusus-undae (Entz, Sr.) Kofoid and Campbell 



(Figure 125) 



Tintinnus lusus-undae, Kofoid and Campbell, 1929, p. 335, fig. 

 656; Alzamora, 1929, pp. 5-6, fig. 10; Marshall, 1934, pp. 

 657-658, fig. 39; Hofker (part), 1931, p. 387 (for fig. 84 see 

 E. tubulostis). 



The moderately tall lorica, with widely flaring funnel, 

 oral brim, tapering shaft, and brimlcss wide aboral end, has 

 a length of 3.02 oral diameters. The oral margin has a hori- 

 zontal brim and a diameter of 0.93 oral diameter. The shaft 

 flares as a wide funnel (38°) with a length of only 0.5 oral 

 diameter, and with a diameter at the lower end of 0.88 oral 

 diameter. The shaft is a tapering cylinder (4°), the length 

 of which is nearly 0.84 total length, and the aboral diameter 

 of which is about 0.4 oral diameter. The wide-open aboral 

 end has neither flare nor brim. 



The wall is hyaline, not over 0.0 1 oral diameter in thick- 

 ness, with laminae that enclose homogeneous matter. 



There are 8 macronuclei. 



Length, i6g\i. 



Marshall's (1934) loricae are longer than those of this 

 expedition (176 to 2981.1), and have taller funnels. Hofker's 

 material apparently includes E. tubulosus, and possibly other 

 species. 



Eutintinnus lusus-undae is not swollen in the middle of 

 the shaft as is E. turgcscens, and its shaft is stouter and has 

 a wider funnel than in E. tenuis. Eutintinnus tubulosus is 

 shorter and more slender, with little suboral flare. 



Recorded from seventy-three stations, sixteen in the 

 Atlantic and fifty-seven in the Pacific, as follows: four (2, 

 14, 15, 16) in the Gulf Stream, one (4) in the Atlantic drift, 

 four (17, 18, 20-21, 21) in the Sargasso Sea, five (23, 24, 25, 

 26, 28) in the Atlantic equatorial region, two (32, 33) in the 

 Caribbean Sea, six (35, 35-36, 36, 37, 152, 153) in the Pacific 

 equatorial region, fourteen (40, 41, 42, 43, 44, 45, 46, 47, 69, 

 71, 73, 77, 78, 80) in the Galapagos region, three (50, 54, 59) 

 in the South Pacific middle latitudes, four (87, 98, 157, 158) 

 in the region of South Pacific island fields, eleven (loi, 102, 

 10:;, 104, 105, 106, 107, 108, 109, 138, 151) in the North 

 Pacific trade region, eight (iii, 112, 113, 141, 142, 143, 144, 

 145) in the North Pacific middle latitudes, and eleven (130, 

 131, 132, 133, 134, 135, 136, 137, 146, 148, 149) in the Cali- 

 fornia region. This virile, dominant species is to be expected 

 in all warm and temperate seas, and is lacking only in the 

 coolest waters of the Arctics. 



There are 79 pump and 46 net samples, of which 44 were 

 taken at the surface, 43 at 50 meters, and 38 at 100 meters. 

 Eutintinnus lusus-undae is most frequent in the upper levels 

 of the sea, progressively diminishing in numbers at the 



