52 BULLETIN 10 4, UNITED STATES NATIONAL MUSEUM 



ABTICULINA UNEATA H. B. Brady 



Plate 11, Figures 8-10; Plate 12, Figure 1 



Articulina lineata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 183, pi. 12, figs. 19-21. — CusHMAN, Proc. U. S. Nat. Mus., vol. 59, 

 1921, p. 73, pi. 18, fig. 6; Publ. 311, Carnegie Instit. Washington, 1922, 

 p. 70, pi. 12, fig. 4. 



Test much compressed, even in the earlier portion, which is triloc- 

 uline, the later portion consisting of one or two much-compressed 

 chambers in linear arrangement; the aperture with a lip much thick- 

 ened at the edge, but not everted and not extending out beyond the 

 periphery of the chamber; chambers distinct, with numerous fine 

 longitudinal costae; wall translucent, of a bluish-white color. 



Length, 1 mm.; breadth, 0.50 mm.; thickness, 0.15 mm. 



This species occurs both in the Indo-Pacific and the West Indian 

 region. It is known from Jamaica and the Tortugas region and as 

 far north as Bermuda. There is usually but a single uniserial cham- 

 ber but occasionally two are developed. 



The shape of the test in the uniserial portion is very different from 

 that in A. sagra where the lip is everted and the sides stand out 

 beyond the chamber below. In A. lineata the lip though well devel- 

 oped does not stand out and the sides are curved downward so that 

 the next added chamber is constricted at the base instead of broadened 

 as in A. sagra. The costae of A. lineata are also much finer. 



ARTICULINA MAYORI Cushman 



Plate 12, Figure 5 



Articulina mayori Cushman, Publ. 311, Carnegie Instit. Washington, 1922, 

 p. 71, pi. 13, fig. 5. 



Test elongate, slender, early portion milioline, later chambers elon- 

 gate, fusiform; surface faintly striate; apertural end contracted, with 

 a distinct, everted lip; aperture circular. 



Length, 1.60 mm.; breadth, 0.18 mm. 



This species is known only from the Tortugas region off Florida. 

 It is a slender species and easily broken which may account in part 

 for its seeming rarity. The early stages are definitely quinquelocuHne. 



ARTICULINA ANTILLARUM Cushman 



Plate 12, Figure 4 



Articulina antillarum Cushman, Publ. 311, Carnegie Instit. Washington, 

 1922, p. 71, pi. 12, fig. 5; Publ. 342, 1924, p. 66, pi. 25, fig. 1. 



Test elongate, early portion in the microspheric form miholine, in 

 the megalospheric form Cornuspira-like , the remainder and larger 

 portion of the test made up of a linear series of elongate chambers 

 gradually increasing in size toward the apertural end; chambers trun- 

 cate at the distal end, then somewhat circular, without a lip ; surface 

 of the chambers with several rounded, longitudinal costae. 



