TAXONOMY AND DISTRIBUTION 



105 



Recorded from forty-one stations, nine in the Atlantic and 

 iliirty-two in the Pacific, as follows: two (19, 20) in the 

 Sargasso Sea, seven (22, 24, 25, 27, 28, 29, 30) in the Atlantic 

 n|uatorial region, seven (45, 46, 47, 68, 75, 78, 80) in the 

 Ciahipagos region, three (48, 81, 159) in the region of South 

 Pacific island fields, five (62-63, ^it ^4' ^5' 67) in the South 

 Pacific middle latitudes, five (100, 109, no, 140, 150) in the 

 North Pacific trade region, three (113, 141, 142) in the North 

 Pacific middle latitudes, eight (133, 134, 135, 136, 137, 146, 

 148, 149) in the California region, and one (152) in the 

 Pacific equatorial region. 



There are 26 pump and 29 net samples, of which 4 were 

 taken at the surface, 20 at 50 meters, and 21 at 100 meters. 

 Frequency, 8 per cent at station 113; other records above 

 minimum (2 to 7 per cent) from stations 19, 20, 24, 27, 28, 

 30, 68, 75, 78, 80, 146, 149, 152; averages in net samples, 2.2 

 and 2.3 per cent in the Atlantic and Pacific, respectively; in 

 pump samples, maximum 7 loricae, average 2.2 in the Pacific. 



Temperature: Atlantic, pump sample 24?44, net samples 

 i4?6o-27?88 (22?03); Pacific, i5?84-27?67 (2i?22) and 

 ii?48-28?6o (2i?94), respectively. Salinity: Atlantic, pump 

 sample 36.18, net samples 35-61-37.15 (36.25); Pacific, 34.47- 

 36.41 (35.75) and 34.30-36.03 (35.22), respectively. Den- 

 sity: Atlantic, pump sample 24.42, net samples 23.26-26.62 

 (24.53); Pacific, 22.31-25.48 (24.48) and 22.77-26.50 (24.45), 

 respectively. pH: Atlantic, pump sample 8.21, net samples 

 7.93-8.30 (8.17); Pacific, 8.08-8.39 (8-24) and 7.76-8.39 

 (8.25), respectively. 



Proplectella merriami, new species 

 (Plate I, figure 2) 



The small, conelike lorica has a length of 4.4 oral diam- 

 eters. The oral margin is thin, sharp, and smooth. The 

 inner collar has a length of somewhat less than 0.75 oral 

 diameter although it is not clearly differentiated; the upper 

 half is a funnel (35°) and the lower section widens out 

 below and meets the wall of the bowl. The wall of the 

 bowl has a thickness of o.i oral diameter at this level and a 

 little less posteriorly, reaching its minimum thickness at the 

 aboral tip. The wall has very thin inner and outer laminae, 

 between which is a nonprismatic thicker intermediate mate- 

 rial. The lorica swells slightly away from the oral margin 

 and reaches a ma.ximum diameter of 1.13 oral diameters at 

 1.35 oral diameters below the rim. There is a barely appre- 

 ciable suboral constriction at about the lower level of the 

 inner collar. The bowl continues below the level of the 

 greatest diameter as a moderately full cone (38°). The 

 aboral end is sharply pointed. 



Length, 6^\x.; diameter, oral 17^1, maximum 231^. 



Proplectella merriami resembles P. citspidata in general 

 form, but has different proportions (length 3.4 as against 2.2 

 to 2.6 oral diameters). 



Recorded from one station (4) in the Atlantic drift, in a 

 net sample taken at 50 meters. Frequency, minimum. 



Temperature, 14^32; salinity, 36.00; density, 26.91; pH, 8.15. 



Type locality, station 4, at 50 meters; latitude 44° 39' 

 north, longitude 33° 06' west. 



Proplectella ostenfeldi Kofoid and Campbell 



Proplectella ostenfeldi Kofoid and Campbell, 1929, p. 279, fig. 

 537- 



The very short, stout lorica, with wide aboral region, has 

 a length of 1.61 oral diameters. The oral margin is sharp. 

 The bowl gradually widens to 1.16 oral diameters at the 

 middle, and contracts (33° anteriorly and 85° aborally) to 

 the simple, pointed aboral end. 



The wall is thickest suborally, where it is almost 0.08 oral 

 diameter in the indistinctly differentiated inner collar; it 

 diminishes regularly aborally. There are thin laminae and 

 enclosed clear material. 



Length, 43 to 55^. 



Proplectella ostenfeldi is stouter, thinner-walled, and less 

 contracted aborally than P. acuta. It does not bulge pos- 

 teriorly like P. subacuta. It is wider and plumper than 

 Undella ostenfeldi, but may be a form of that species under 

 different physical conditions. 



Recorded from five stations, two in the Atlantic and three 

 in the Pacific, as follows: two (22, 23) in the Atlantic equa- 

 torial region, one (45) in the Galapagos region, and two 

 (85, 95) in the region of South Pacific island fields. 



There are 5 net samples, of which i was taken at the sur- 

 face, 3 at 50 meters, and i at 100 meters. Frequency, 2 per 

 cent at station 85; average in the Pacific, 1.3 per cent. 



Temperature: Atlantic, 20?99-24?44 (22?7i); Pacific, 

 22?43-28?74 (26?35). Salinity: Adantic, 36.04-36.18 (36.11); 

 Pacific, 35.26-36.84 (35.61). Density: Atlantic, 24.42-25.30 

 (24.85); Pacific, 22.43-24.31 (23.37). pH: Atlantic, 8.14- 

 8.21 (8.17); Pacific, 8.12-8.22 (8.18). 



Proplectella ovata (Jorgensen) Kofoid and Campbell 

 (Figure loi) 

 Proplectella ovata, Kofoid and Campbell, 1929, p. 280, fig. 529. 



The large, wide, baggy, somewhat angular lorica has a 

 length of 1.77 oral diameters. The oral margin is angular. 

 The bowl expands at the middle to 1.39 oral diameters and 

 then contracts (34° increasing to 90° and finally to 121° 

 near the aboral end). The bowl as a whole is clearly con- 

 vex. The aboral end is minutely prolonged as a point. 



The wall is thickest suborally, where it reaches 0.14 oral 

 diameter: it is reduced in the lower bowl to about three- 

 quarters as much, and is much less again aborally. The 

 inner collar is nearly cylindrical, and 0.28 oral diameter in 

 length. There is a sharp angle where the wall thins at the 

 junction with the bowl. There are rather thick laminae 

 which enclose radial secondary prisms; this is almost unique 

 in the genus. 



Length, 63 to 75|.(. 



Proplectella ovata is more angular aborally than P. globosa, 

 and is without the aboral pointing of P. angitstior. Proplec- 

 tella tenuis is shaped more like an olive pit than this species. 



Recorded from thirty-eight stations, sixteen in the Atlantic 

 and twenty-two in the Pacific, as follows: two (15, 16) in the 

 (»ulf Stream, four (18, 19, 20, 21) in the Sargasso Sea, seven 

 (23, 25, 26, 27, 28, 29, 30) in the Atlantic equatorial region, 

 three (31, 33, 34) in the Caribbean Sea, three (35, 99, 152) 



