no 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Undellopsis lineata Kofoid and Campbell 



(Figure no) 



Undellopsis lineata Kofoid and Campbell. 1929, p. 269, fig. 514. 

 Undella warstipialis, Alzamora, 1929, p. 8, fig. 17. 



The moderate-sized lorica, of general marsnpialis-\'ike 

 form, has an expanded, saccular aboral region, a rounded 

 aboral end, and a length of 2.0 oral diameters. The oral rim 

 is rounded. There is a low suboral cuff with a narrow shelf 

 at the junction of cuff and bowl (1.16 oral diameters in 

 diameter). The upper bowl (0.79 total length in length) 

 has sweepingly concave sides; it reaches 0.9 oral diameter at 

 0.39 total length. The lower bowl is low and panlike (an- 

 terior diameter the same as that of the suboral shelf), with 

 a broadly rounded bottom, and with little angle at the line 

 of junction with the upper howl. 



The wall thickness averages 0.06 oral diameter save sub- 

 orally, where it is more. There are thin laminae and en- 

 closed hyaline material. 



Length, 108 to i20|^l. 



The Carnegie loricae are longer (i2q|^i) than usual, and 

 show sharper distinction between upper and lower bowls. 



Undellopsis lineata differs from its near relative U . mar- 

 supialis in the more swollen aboral region, rounded aboral 

 end, and less developed suboral shelf. 



Recorded from one station (25) in the Atlantic equatorial 

 region, in a net sample taken at 100 meters. Frequency, 7 

 per cent. 



Temperature, i4?6o; salinity, 35.70; density, 26.62; pH, 7.93. 



Undellopsis marsupialis (Brandt) emended Kofoid 

 and Campbell 

 (Figure 104) 

 Undellopsis marsupialis, Kofoid and Campbell, 1929, p. 269, 

 fig- 515- 



The moderate-sized lorica, with strong suboral ledge, 

 concave sides, some aboral expansion, and pointed aboral 

 end, has a length of 2.43 oral diameters. The oral rim is 

 sharp-edged. There is a fairly high suboral cuff and a flat 

 ledge at the junction of cuff and bowl (1.23 oral diameters). 

 The upper bowl, with a length of 0.81 total length, is con- 

 cave; its minimum diameter of i.o oral diameter is reached 

 at 0.28 total length below the rim. The lower bowl is pan- 

 shaped, with its greatest diameter of 1.23 oral diameters at 

 its upper edge. The bottom is broadly rounded, save that 

 the aboral end itself is obscurely pointed. The angle of junc- 

 tion of the two parts of the bowl is rounded. 



The wall thickness is subuniformly 0.07 oral diameter 

 save near the aboral end, where it is thinner. There are thin 

 laminae and enclosed hyaline material. 



Length, 1381.1. 



The Carnegie loricae are longer than is usual for this 

 species. 



Undellopsis marsupialis differs from U . lineata in greater 

 suboral development, less concave sides, less aboral expan- 

 sion, and presence of an aboral point. 



Recorded from four stations (22, 23, 25, 27) in the 

 Atlantic equatorial region. 



There are 2 pump and 4 net samples, of which i was 

 taken at 50 meters and 5 at 100 meters. Frequency, 4 per 

 cent at station 22; average, 3 per cent. 



Temperature: pump samples i4?6o-26?o4 (2o?32), net 

 samples i4?6o-i8?o8 (i6?67). Salinity: pump samples 

 36.25-37.70 (36.97), net samples 35.70-36.10 (35.88). Den- 

 sity: pump samples 23.90-26.62 (25.26), net samples 26.06- 

 26.62 (26.32). pH: pump samples 7.93-8.30 (8.1 1), net 

 samples 7.93-8.18 (8.04). 



Undellopsis pacifica Kofoid and Campbell 

 (Figures 107, 109) 

 Undellopsis pacifica Kofoid and Campbell, 1929, p. 270, fig. 513. 



The short lorica, of warsiiptalis-Wke form but with little 

 lateral concavity, and with aboral inflation and rounded 

 aboral end, has a length of 1.9 oral diameters. The oral 

 margin is thin. There is a low cuff with outer concavity, 

 below which the bowl rounds off. The bowl tapers (10°) 

 for 0.84 total length, and has a diameter at its lower end of 

 0.9 oral diameter. The aboral region (0.16 total length) is 

 soup-bowl shaped. The aboral end is nearly flat, and its 

 diameter is about 0.67 oral diameter. 



The wall has a thickness of nearly 0.14 oral diameter at 

 the suboral shoulder, and thins down to half as much in the 

 posterior region. There are relatively thick laminae (which 

 fuse in the suboral cuff) and enclosed homogeneous matter. 



Length, 1131^1. 



One of the loricae figured (fig. 107) has distinct lateral 

 concavity and aboral expansion much as in U. marsupialis. 

 The other lorica (fig. 109) has scarcely any lateral concavity, 

 and no inflation. Both are extremes. 



Undellopsis pacifica resembles U. marsupialis, but lacks 

 the sweeping lateral concavity, the distinct aboral swelling, 

 and the aboral point. Undellopsis linearis has pronounced 

 aboral swelling and no point. Undellopsis cubilum and U. 

 subangulata are more rectangular in optical section than the 

 above species. 



Recorded from five stations in the Pacific, as follows: 

 three (41, 42, 75) in the Galapagos region, one (67) in the 

 South Pacific middle latitudes, and one (136) in the Cali- 

 fornia region. 



There are 5 net samples, all taken at 100 meters. Fre- 

 quency, 5 per cent at station 75; average, 2.5 per cent. 



Temperature, i4?33-i8?87 (i6?5o); salinity, 34.70-35.47 

 (35.05); density, 25.09-26.17 (25.67); pH, 7.91-8.39 (8.08). 



Undellopsis tricoUaria (Laackmann) emended Kofoid 

 and Campbell 



Undellopsis tricoUaria, Kofoid and Campbell, 1929, p. 272, fig. 

 522. 



The short, wide lorica, with two rings on the anterior 

 cylinder, inflated lower bowl, and rounded aboral end, has a 

 length of 2.2 oral diameters. The oral margin is sharp- 

 edged. The suboral ledge is angular (120°) at 0.18 total 

 length below the rim, and has a diameter of 1.13 oral diam- 

 eters. The upper bowl is subcylindrical (10°) and nearly 

 0.73 total length in length; it has two rings, the upper 1.14 



