38 PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 



FLABELLINA SEMIRETICULATA Cnshman and Jarvis 



Plate 11, FiGtTBE 14 



Flabellina semireticvlata Cushman and Jakvis, Contr. Cushmau Lab. Foram. 

 Res., vol. 4, p. 98, pi. 13, fig. 14, 1928. 



Test rhomboid in front view, much compressed, apertural end 

 extended ; chambers and sutures obscured by the surface ornamenta- 

 tion, which consists of a more or less irregular reticulation, the sides 

 of the polygonal areas raised, thin and platelike. Length, 0.6; 

 breadth, 0.35; thickness, 0.08 mm. 



This form was described by us as a new species in the above 

 reference. It is to be suspected that it may be only a form of the 

 preceding species, but more material is necessary to determine this 

 point definitely. 



FLABELLINA INTERPUNCTATA von der Marck 

 Plate 12, Figxjke 1 



Flabellina interpunctata von der Makck, Verb. nat. Ver. preuss. Rheiul., vol. 

 15, p. 53, pi. 1, fig. 5, 1858.— Reuss, Sitz. Akad. Wiss. Wien, vol. 40, p. 216, 

 pi. 9, fig. 1, 1860. — Heron-Allen and Eaeland, Joura. Roy. Mici'. Soc, p. 422, 

 pi. 8, fig. 5, 1910.— Feanke, Bronn. Verb. Nat. Hist. Ver., vol. 59, p. 277, 

 1912 (1913).— Chapman, Bull. Geol. Surv., Western Australia, No, 72, 

 p. 34, pi. 10, fig. 91, 1917.— Frankb, Abb. geol. pal. Inst. Univ. Greifswald, 

 vol. 6, p. 64, pi. 5, fig. 13, 1925 ; Jabrb. preuss. Geol. Landes., vol. 48, p. 678, 

 1927 ; Abb. preuss. Geol. Landes., vol. Ill, p. 92, pi. 8, fig. 17, 1928.— White, 

 Journ. Pal., vol. 2, p. 203, 1928. — Cushman, Contr. Cusbman Lab. Foram. 

 Res., vol. 6, p. 30, pi. 4, figs. 16, 17, 1930. 



Flabellina rugosa Beissel (not d'Orbigny), Abb. Kon. Preuss. geol. Landes., 

 vol. 3, p. 47, pi. 9, figs. 20-24, 1891. 



Frondlcularia projecta Carsby, Univ. Texas Bull. 2612, p. 41, pi. 6, tig. 5, 1926. 



Frond icitl aria baudouiniana Cushman (not d'Orbigny), Contr. Cusbman Lab. 

 Foram. Res., vol. 2, p. 21, pi. 3, fig. 5, 1926; Journ. Pal., vol. 1, p. 155, 

 pi. 24, fig. 13, 1927. 



Test sagittate to rhomboid in outline, much compressed, sides 

 nearly flat, periphery truncate; early chambers coiled, later ones 

 extending back on both sides; sutures raised and sharp, later cham- 

 bers with a loop or series of loops at the apical end of the chamber ; 

 wall between the raised sutures with a series of small papillae; 

 apertural end slightly projecting. 



This is a very characteristic species with its raised, clear-cut 

 sutures and the papillate wall. The peculiar looplike extensions in 

 the median line in the adult are also characteristic even if the 

 papillae are covered. 



The species is very widely distributed and is naturally subject to 

 considerable variation. The main characters, however, remain con- 

 stant, and its vertical range is considerable. 



