ROTALimAE — TRUNCATULINA; SIPHONINA. 49 



dorsal side of the two being very similar, but the ventral side very 

 different, that of T. candeiana being distinctly convex, while that of 

 T. cora is very flat. 



Truncatulina advena (d'Orbigny). 



(Plate 7, Figures 6 to 9.) 

 Truncatulina advena d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Fora- 

 minif^res," p. 97, pi. 6, figs. 3 to 5. 



Test plano-convex, dorsal side flattened, ventral side rounded; periphery 

 lobulated; last-formed coil composed of about 8 chambers; sutures of the 

 dorsal side much curved, those of the ventral side nearly radial, gently curved, 

 depressed much more on the ventral than on the dorsal side; wall coarsely 

 punctate; aperture close to the periphery at the inner edge of the last-formed 

 chamber, short and somewhat arched; color very sUghtly brown m the mner 

 whorls, otherwise white. 



Diameter of the Tortugas specimens not exceeding 0.50 mm. 



This species, described by d'Orbigny from the shore sands of Cuba 

 and Jamaica, has occurred at several stations in the Tortugas col- 

 lection. It is somewhat closely related to Truncatulina lobatula 

 (Walker and Jacob), but differs in several points from that species 

 as developed in temperate climates. The sutures in T. lobatula are 

 typically limbate and the periphery carinate, but in this tropical 

 T. advena such characters do not occur. From the flattened dorsal 

 surface it would seem that the species is probably an attached one. 



Genus SIPHONINA|Reuss, 1849. 

 Siphonina pulchra Cushman. 



(Plate 7, Figures 11, 12.) 

 Stp/wnina 7nt?c;iraCushman.CarnegieIn&t.Wash.,Pub.291.1919,p.42,pl.l4,figs.7otoc. 

 Siphonina reticulata Cushman (notCzjzek), Carnegie Inst. Wash., Pub. 291. 1919, p. 42. 



Test in front view nearly circular, rotaliform; composed of numerous 

 chambers in several whorls, in end view much compressed, widest in the 

 central region, thence gradually tapering to the sub-acute periphery, chambers 

 usually about 5 to each whorl, indistinct, except the last-formed chamber, 

 which is somewhat more clearly defined by the sHghtly depressed suture, 

 those of the other chambers being even with the surface and very indistinct; 

 aperture exsert, with a short neck extending out from the periphery, passing 

 into a broadly flaring Hp with a distinct, extended border, aperture itseK 

 narrowly elliptical, several times as long as wide; wall of test of a darker gray 

 with markings of a lighter color, those of the center rounded, those toward 

 the periphery more hnear. 



Diameter of the Tortugas specimens up to 0.65 mm. 



Numerous specimens of S. pulchra are in this collection from the 

 Tortugas, but usually few from any one station. They are evidently 

 the same as the species I have described from the marl of the gorge 

 of the Yumuri River, Matanzas, Cuba. I also recorded from this 

 same marl Siphonina reticulata, but a reexamination of these speci- 

 mens and a comparison with the Tortugas ones seems to show that 

 the young of Siphonina pulchra is somewhat fimbriate on the border, 

 and the ornamentation of the test is much more coarse than in the 



