ART. 3 NEW SPECIES OF FOEAMINIFEEA VAUGHAN 7 



(See p. 5.) It appears unnecessary to give another description of 

 it. The chambers in it are connected with the outer embryonic 

 chamber by the passages described, and, as seen in horizontal section, 

 they connect with the chambers of the next annulus by passages 

 one on each side of the proximal end of the radial walls of the 

 chambers of that annulus. This section as cut exhibits annular 

 connections between chambers of the same annulus in only a few 

 places, but they are sufficient to show that an annular stolon was 

 present. 



It is unnecessary to describe the arrangement, shape, and size of 

 the equatorial chambers, as these features do not differ significantly 

 from those of the specimens already described. The perforations of 

 the chamber roofs and floors are well shown in the section, and they 

 are rather large, ranging from about 2/i to 4^t across. 



A vertical section of this variant does not exhibit any noteworthy 

 difference from the vertical section described on page 5. 



The two horizontal sections of Discocyclina weaveri already described 

 have the initial chamber almost entirely surrounded by the second 

 chamber, and that relation suggested that the species might be 

 subgenerically different from typical Discocyclina. A horizontal sec- 

 tion of another of the variant just described shows an apparently 

 renif orm embryonic apparatus. This appearance may be, and probably 

 is, due to plane of the section being inclined and not passing through 

 the center of the chambers. 



DISCOCYCLINA WEAVERI var. PARVIPAPILLATA, new variety 



Plate 1, figures 3, 4, 4a 



This variety differs from the typical form of the species by being 

 still more compressed than the last-described variant and by having 

 still smaller papillae, but the structural plan is the same as in the 

 typical form and its variants. Diameter, two uncut specimens: (a) 

 2.75 mm., (6) 3.20 mm. Thickness: (a) 0.5, (6) 0.8 mm. Diameters 

 of vertical sections of two specimens: (a) 1.4, (6) 1.6 mm. Thick- 

 ness: (a) 0.44, (&) 0.46 mm. Of the latter two specimens (6) is 

 broken on one side and was probably about 2 mm. in diameter. The 

 diameter of the papillae ranges from 35iJ, to 50//. Around each 

 papilla are thin radiating plates, five or six in number where not 

 broken away. These plates are more or less sinuous, coalesce, and 

 produce a vermicular texture on the surface. 



Neither of two horizontal sections showed the details of the 

 embryonic chambers. The equatorial and lateral chambers are sim- 

 ilar to those of the typical form except that the tests are thinner and 

 the pillars smaller. It seems unnecessary to describe these features in 

 detail. They are illustrated by Plate 1, figures 3, 4, 4a. 



