TAXONOMY AND DISTRIBUTION 



95 



bowl is widened out within the anterior oral diameter to 

 1.25 oral diameters, and then contracts (10°) for 0.45 total 

 length; the diameter at the lower end of this section is little 

 more than r.o oral diameter. The aboral section is sub- 

 conical (23° in the upper four-fifths and 120 in the posterior 

 fifth), the angles of change being marked. The aboral end 

 is pointed. 



The wall thickness is subuniformly 0.09 oral diameter. 

 There are thin laminae with enclosed hyaline material. A 

 pore rarely penetrates the aboral end. 



Length, 17311. 



Undella attenuata has a biconical, pointed aboral end un- 

 like that of U . bulla; it has a longer bowl than U. parva; its 

 proportions differ from those of U. declivis, and the angles 

 of the aboral end are unlike those in U . hyalina. 



Recorded from seven stations in the Pacific, as follows: 

 two (51, 54) in the South Pacific middle latitudes, one (109) 

 in the North Pacific trade region, three (142, 144, 145) in 

 the North Pacific middle latitudes, and one (146) in the 

 California region. 



There are 9 pump and 2 net samples, of which 4 were 

 taken at 50 meters and 7 at 100 meters. Frequency, 2 per 

 cent at stations 54, 146; in pump samples, there were 4 

 loricae at station 145. 



Temperature: pump samples i6?90-22?45 (19^27), net 

 samples i8?74~2o?07 (i9?4o). Salinity: pump samples 

 34.32-35.62 (34.76), net samples 34-3 2 -35-35 (34- 8 3>- Den- 

 sity: pump samples 23.95-25.24 (24.72), net samples 24.24- 

 25.37 (24.81). pH: pump samples 8.18-8.37 (8- 2 9)> net 

 samples 8.16-8.26 (8.21). 



Undella californiensis Kofoid and Campbell 



Undella californiensis Kofoid and Campbell, 1929, p. 261, fig. 

 501. 



The small lorica, shaped like a plump electric-light bulb, 

 has a length of 2.6 oral diameters. The oral margin is 

 abruptly thinned to a sharp edge. The upper bowl is a cylin- 

 der 0.35 total length in length, with posterior conical ex- 

 pansion (12 ); the lower bowl is a subhemisphere with a 

 maximum diameter of 2.0 oral diameters at 0.6 total length 

 below the rim. The aboral end has a trace of flattening. 



The wall is subuniformly 0.15 oral diameter in thickness 

 except immediately below the suboral section. The laminae 

 enclose homogeneous material. 



Length, Ji\i. 



Undella californiensis bears little likeness to other species 

 of Undella. It is a little like Amplectcllopsis angularis and 

 Proplectella expolita, from which it differs in that its wall is 

 subuniform in thickness, and in its lack of inner collar. 



Recorded from one station (131) in the California region, 

 in a net sample taken at 100 meters. Frequency, 2 per cent. 



Temperature, 12? 12; salinity, 33.36; density, 25.31; pH, 

 8.32. 



Undella carnegiei, new species 

 (Plate I, figure 13) 



The elongated, tall lorica has a length of 8.86 oral diam- 

 eters. The oral rim is thin, regular, and smoothed over. The 



wall of the bowl immediately swells away from the margin, 

 this upper section forming a collar-like region. This sub- 

 oral segment is a truncated cone (23°), with a length of 

 about 0.8 oral diameter. Its sides arc full but not markedly 

 convex. The diameter ot its lower end is 1.2 oral diameters. 

 The bowl may be subdivided conveniently into no less than 

 three subdivisions. The anterior one is the longest; it has 

 the general form of a cylinder and a length of approximately 

 3.3 oral diameters. Its diameter at its lower end is the same 

 as that of the anterior end (1.2 oral diameters). The sides 

 are full, barely convex, and regular. The second subdivision 

 is below the first, and is a basal segment ot a truncated cone 

 (18°), with a length of 3.53 oral diameters. It has a slight 

 tendency to be concavely contoured, especially in its aboral 

 half. It reaches its least diameter at its lower end, where it 

 is about 0.38 oral diameter. The third subdivision is a short, 

 wide, inverted, hollow-sided cone (over 70 ), with a length 

 of 0.46 oral diameter. It is asymmetrical, one side being 

 nearly a third higher than the other. The aboral end is 

 pointed, but not prolonged, and is closed off. 



The wall is thin, about 0.0 1 oral diameter across, and is 

 subuniform at all levels. Inner and outer laminae enclose 

 clear interlaminar substance. The lumen follows exactly 

 the outer contour. 



Length, 4431.1; diameter, oral 50U, maximum 6511. 



Undella carnegiei is almost unique in the genus, and its 

 closest relative is probably the other new species described in 

 this report, U. hawaiensis. These two species differ in size, 

 proportions, and especially in aboral characters. In hawai- 

 ensis the aboral cone is rounded rather than angular, there is 

 an interpolated subcylindrical region above this cone, the 

 conical region suborally from this section is flat-sided, and 

 at the oral end there is no collar-like section, or rather a 

 narrow one instead of a wide cone. It bears very little like- 

 ness to previously described species. 



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

 (151) in the North Pacific trade region and one (152) in the 

 Pacific equatorial region. 



There are 2 net samples, of which 1 each was taken at 50 

 and 100 meters. Frequency, 3 per cent at station 152; aver- 

 age, 2 per cent. 



Temperature, n?48-i8?28 (14^88); salinity, 34.42-34.73 

 (34.57); density, 24.77-26.50 (25.63); pH, 7.76 at station 152. 



Type locality, station 151, at 50 meters; latitude 12 40' 

 north, longitude 137 32' west. 



Undella clevei Jorgensen 

 Undella clevei, Kofoid and Campbell, 1929, p. 261, fig. 503. 



The tiny lorica is phial-shaped, with a blunt aboral end, 

 and has a length of 2.73 oral diameters. The oral margin is 

 thin and erect. The bowl expands to 1.12 oral diameters at 

 its middle, then contracts (15 in the upper four-fifths and 

 103 in the lower part). The aboral end is blunted. 



The wall has a thickness of almost 0.13 oral diameter at 

 the most. There are thin laminae with enclosed hyaline 

 material. The lumen is modified by slight suboral thicken- 

 ing. 



