TAXONOMY AND DISTRIBUTION 



29 



There are 5 net samples, all taken at 50 meters. Fre- 

 quency, 2 per cent at stations 78, 81. 



Temperature, 22?37-26?42 (23?94); salinity, 35-23-36.03 

 (35-55); density, 23.56-24.33 (24.08); pH, 8.13-8.17 (8.15). 



Codonellopsis parva Kofoid and Campbell 



(Figures 2, 3) 

 Codonellopsis parra Kofoid and Campbell, 1929, p. 86, fig. 170. 



The rather short, stout lorica, with collar and bowl more 

 or less subequal, and with short neck, rounded bowl, and 

 conical aboral horn, has a length of 2.16 to 3.34 oral diam- 

 eters. The oral margin is thin-edged, and there is some 

 suboral eversion with flare (58°), or even a flat brim. The 

 collar (0.32 to 0.38 total length) is a segment of an inverted 

 truncated cone (3° to 4°) with a diameter at the aboral end 

 of 0.79 oral diameter. The sides show almost no lateral 

 modification in contour. The collar is made up of 15 to 17 

 spiral turns, of which the anterior 3 or 4 are a little narrower 

 than the others; the remainder are subequal, and all have 

 thin, molded edges. One or two of the turns overlap. The 

 neck is rounded, with a ma.ximum diameter of 0.93 oral 

 diameter and contraction below (0.83 oral diameter); this 

 contraction is at 0.37 to 0.46 total length below the rim and 

 marks the lower limit of the neck. The bowl swells rapidly 

 from the neck and reaches as much as 1.32 oral diameters 

 near 0.56 total length. The full, convex lower bowl con- 

 tracts evenly and reaches 0.28 oral diameter at 0.83 total 

 length. The aboral horn is conical (11° to 15°), with a 

 length of 0.52 to 0.62 oral diameter, and has a blunted to 

 sharply pointed free tip. 



The wall of the collar is only 0.02 oral diameter in thick- 

 ness, or less, but that of the bowl is nearly 0.07. The bowl 

 has large, mostly rectangular tertiary areas in one or two 

 layers, with pallid contents. The surface of the bowl has a 

 subequal mesh of tertiary areas; rarely are there (4) hemi- 

 spherical bosses of small secondary hexagons built into the 

 equatorial region. The wall of the horn is reticulate. The 

 cavity of the bowl is separated from that of the horn by a 

 thin diaphragm. 



Length, 145 to 1 871.1. 



The Carnegie loricae are longer and commonly more 

 slender than those described elsewhere. 



Codonellopsis parva has a shorter, less stout, narrower 

 bowl and longer horn than C. pura. Its collar is not so long 

 as that of C. speciosa, and its horn is narrower and more 

 abruptly limited. The horn is not so long as in C. minor, 

 and the bowl not so swollen as that of C. turgida. Codo- 

 nellopsis paeifica has a taller collar and much longer horn. 



Recorded from thirteen stations, seven in the Atlantic and 

 six in the Pacific, as follows: one (2) in the Gulf Stream, 

 one (20) in the Sargasso Sea, three (23, 25, 28) in the 

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

 Sea, one (77) in the Galapagos region, one (100) in the 

 North Pacific trade region, three (153, 154, 155) in the 

 Pacific equatorial region, and one (157) in the region of 

 South Pacific island fields. 



There are 15 net samples, of which 2 were taken at the 



surface, 6 at 50 meters, and 7 at 100 meters. Maximum 

 frequency, 26 per cent at station 154; other records above 

 minimum (2 to 8 per cent) from stations 2, 20, 23, 25, 77, 

 100, 153, 157; average in the Pacific, 8.4 per cent. 



Temperature: Atlantic, i4?6o-26?79 (22? 12); Pacific, 

 22?73-27?76 (25?96). Salinity: Atlantic, 35.70-36.73 (36.32); 

 Pacific, 34.71-36.04 (35.08). Density: Atlantic, 23.79-26.02 

 (25.18); Pacific, 22.31-24.53 (23.16). pH: .-Atlantic, 7.93- 

 8.26 (8.16); Pacific, 7.93-8.32 (8.20). 



Codonellopsis pura (Brandt) emended Kofoid and Campbell 



(Figure i) 



Codonellopsis pura, Kofoid and Campbell, 1929, pp. 86-87, fig. 

 169. 



The short, plump lorica, with collar shorter than bowl, 

 wide bowl with stout neck, and tiny knoblike aboral horn, 

 has a length of 2.22 oral diameters. The thin oral margin 

 has a recurved brim (not clearly shown in the figure), and a 

 subcylindrical collar the length of which is only 0.29 total 

 length; its aboral diameter is 0.83 oral diameter. Local 

 modifications are absent. There are 9 subequal spiral turns, 

 each with thickened edges. The neck is a convex ring. Its 

 greatest diameter is 0.89 oral diameter, its least, at the lower 

 end, is 0.83, and its width is nearly 0.29 oral diameter. The 

 rotund bowl swells out to a maximum, at its equator, of 1.29 

 oral diameters; this is at 0.63 total length from the rim. 

 Below its equator the bowl is hemispherical. The short 

 aboral horn is conical (25°), and only 0.2 oral diameter in 

 length; its free tip is squared off. 



The wall of the collar is only 0.02 oral diameter in thick- 

 ness, and that of the bowl is subuniformly nearly 0.07. There 

 is a dark inner lamina. The bowl is rather pallid, with only 

 large, narrow, rectangular tertiary areas clearly marked. The 

 surface shows large, thin-walled, overlapping circles. The 

 collar is nearly transparent and the bowl is somewhat denser. 

 A diaphragm separates the cavity of bowl and horn. 



Length, 125 to 195^. 



The Carnegie loricae are shorter, with a con\ex neck, and 

 have shorter horns than the originals. 



Codonellopsis pura has a shorter horn, a wider bowl, and 

 a shorter collar than either C. parva or C. minor. Its collar 

 is shorter and its horn better developed than in C. calijorni- 

 ensis. The bowl is not so wide as that of C. turgida. 



Recorded from eleven stations, six in the Atlantic and five 

 in the Pacific, as follows: one (18) in the Sargasso Sea, five 

 (22, 23, 24, 25, 27) in the Atlantic equatorial region, two 

 (77, 80) in the Galapagos region, two (81, 157) in the region 

 of South Pacific island fields, and one (100) in the North 

 Pacific trade region. 



There are 2 pump samples from the Pacific, and 10 net 

 samples, of which 6 were taken at 50 meters and 6 at 100 

 meters. Maximum frequency, 6 per cent at station 81; fre- 

 quency 4 per cent at station 157; all the remainder mini- 

 mum; the average frequency in Pacific net samples is 3.6 

 per cent. 



Temperature: Adantic, net samples i4T6o-26?04 (ig?i6); 

 Pacific, pump samples 23?69-27?62 (25?65), net samples 



