12 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Length, 75 to 90^,. 



One of the loricae figured (fig. 16) is unusual. Its length 

 is 1.53 oral diameters. Its howl is distinctly elongated and 

 reaches its greatest diameter at little above the flat distal 

 end, and its whole surface is studded with elongated rhab- 

 doliths. It is go|x in length. The oral rim is entire. 



Codonella olla resembles C. poculum closely, but differs in 

 the expanded and flattened aboral end. Its internal shelf is 

 less developed, there is constriction at the throat, and its 

 collar bulges. Its aboral end is flat, unlike that of C. acerca, 

 which is pointed. 



Recorded from three stations in the Atlantic, as follows: 

 two (19, 20) in the Sargasso Sea, and one (27) in the 

 Atlantic equatorial region. 



Net samples only, of which 1 was taken at 50 meters and 

 2 at 100 meters. Maximum frequency, 2 per cent at station 



Temperature, 22?42-26?04 (>3?7o); salinity. 36.25-37.03 

 (36.71); density, 23.98-25.67 (25.01); pH, 8.19-8.30 (8.24). 



Codonella poculum Kofoid and Campbell 

 Codonella poculum Kofoid and Campbell, 1929, p. 64, fig. 114. 

 The distinctly stout, pot-shaped lorica, with collar undif- 

 ferentiated except by an internal ledge and with rounded 

 bowl, has a length of 1.1 oral diameters. The oral margin 

 is regularly denticulate, there being approximately 50 low, 

 wide, equidistant, regular, triangular teeth. These hyaline 

 teeth arise from a narrow, similar band, the width of which 

 is less than 0.2 oral diameter. The collar is distinguished 

 only by the internal ledge or shelf located near 0.3 oral diam- 

 eter below the rim. The collar is virtually a cylinder with 

 only minor, strictly local modifications in external contour. 

 The internal shelf is triangular (75 ) and, because of its 

 width, reduces the opening between collar and bowl to 0.73 

 oral diameter; its base, against the outer wall, is 0.16 oral 

 diameter in width. The bowl continues the subcylindrical 

 form of the collar for 0.71 total length with a few local ir- 

 regularities, and has a diameter at this level of 0.95 oral 

 diameter. The aboral region rapidly rounds off so that the 

 thimble-shaped end is 0.29 total length below the level of the 

 cylindrical upper section. 



The relatively thick wall reaches, in the mid-region of the 

 bowl, as much as 0.05 oral diameter; in the collar it is about 

 half as much. There are one to five layers of faint, rounded 

 to rectangular secondary prisms as well as a lesser number 

 of much larger tertiary ones. The outer surface shows these 

 prisms in circular shapes. 



There is a strong closing apparatus. 

 Length, 80 to 92|i. 



Codonella poculum closely resembles C. acutula, but its 

 aboral end is rounded instead of pointed as in acutula. It 

 lacks the nuchal constriction which is found in C. olla. The 

 aboral end is less flattened, not expanded, and the wall is 

 different in these two species. Codonella acerca, aside from 

 its smaller size, has a pointed aboral end and also nuchal 

 constriction. 



Recorded from four stations in the Pacific, as follows: one 



(99) in the Pacific equatorial region, two (101, 150) in the 

 North Pacific trade region, and one (148) in the California 

 region. 



Pump samples only of which 1 was taken at the surface, 

 1 at 50 meters, and 2 at 100 meters. Frequency, minimum. 



Temperature, i9?27~27?93 (23?38); salinity, 34.63-34.94 

 (34.81); density, 22.39-24.72 (24.14); pH, 8.21-8.32 (8.25). 



Codonella rapa Kofoid and Campbell 

 (Figure 10) 

 Codonella rapa Kofoid and Campbell, 1929, p. 65, fig. 130. 

 The short, stout, deep-throated lorica, with swollen collar, 

 plump bowl, and small conical aboral horn, has a length of 

 1.74 oral diameters. The minutely subdenticulate, rather 

 regular oral margin is thin-edged. The short, bulging collar 

 has a length of 0.43 oral diameter; its diameter across the 

 middle is 1.09, and at the throat 0.95 oral diameter. Inside 

 the throat is an angular (8o°), rather wide shelf that reduces 

 the aperture to 0.73 the external diameter. The swollen 

 bowl is rotund, reaches its greatest diameter of 1.1 oral 

 diameters near 1.0 oral diameter below the oral rim, and 

 then rather gradually narrows down to the aboral end, where 

 there is a conical (34°) aboral horn (0.26 oral diameter in 

 length) with widely flaring (8o°) base and sharply pointed 

 free tip. 



The wall is thickest in the upper bowl, where it may attain 

 0.08 oral diameter, is reduced gradually in the collar and 

 fundus to less than 0.02 oral diameter, and contains, mostly, 

 only a single layer of large, rectangular prisms. The sur- 

 face shows small hexagonal to circular prisms (primary?), 

 and often each of the large secondary areas has a large cocco- 

 lith enclosed in it. The aboral horn is hollow, but its cavity 

 is cut off from that of the bowl by a thin-walled diaphragm 

 formed of the inner lamina. 

 Length, 781X. 



The Carnegie loricae are not so stout as those described by 

 Kofoid and Campbell (1929). 



Codonella rapa has a more flaring collar, shorter bowl, 

 and stouter horn than C. recta. Codonella amphorella has a 

 longer bowl with less rotundity. These three attractive 

 species of the high latitudes can scarcely be confused with 

 others of the tropical oceans. 



Recorded from two stations (62-63, 64) in the South 

 Pacific middle latitudes. 



Net samples only, 1 taken at the surface and 1 at 1000 

 meters. There were 2 loricae. 



Temperature (at 1000 meters) 3^98; salinity, 34.30; den- 

 sity, 27.25; pH, 7.76. 



Codonella recta Kofoid and Campbell 

 Codonella recta Kofoid and Campbell, 1929, p. 65, fig. 131. 

 The stout lorica, with shallow throat, erect collar, and 

 stout horn, has a length of 1.78 oral diameters. The oral 

 margin is very thin, erect, and entire. The collar is sub- 

 conical (io°) with a length of 0.4 oral diameter; its lower 

 diameter is only a little less than the oral diameter, and the 



