42 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



ventrally slightly curved, line between the whorls clearly marked by a raised 

 rounded ridge of clear shell material, sutures ventrally marked in a similar 

 manner, strongest toward umbilicus, where they often unite in a raised ring; 

 aperture elongate, in the middle of the ventral side next to the previous whorl. 

 Diameter about 1 mm. 



Several specimens of this species were found in the Bowden material 

 from Jamaica. It is a species which as a recent one is practically con- 

 fined to tropical and subtropical regions. It was described by Karrer 

 from the Miocene of the Banat region of Hungary and has been 

 recorded from the Miocene and Pliocene of Italy by several authors. 



Siphonina reticulata (Czjzek). 



Rotalina reticulata Czjzek, Haidinger's Nat. Abh., vol. 2, p. 145, plate 13, figs. 7-9, 1848. 

 Siphonina reticulata Bronn, Lethaea Geognostica, ed. 3, vol. 3, p. 227, plate 35, figs. 23 a to 



c, 1853-1856; Cushman, Bull. 71, U. S. Nat. Mus., part 5, p. 43, fig. 48 (in text), 



plate 16, fig. 4, plate 28, fig. 3, 1915. 

 Truncatulina reticulata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, p. 669, plate 96, 



figs. 5 to 8, 1884. 



There are a few specimens referable to this species in the marl from 

 station 3461, gorge of Yumuri River, Matanzas, Cuba, collected by 

 T. W. Vaughan. It was recorded from the Miocene, Gatun formation, 

 at Monkey Hill, in the Panama Canal Zone. 



Various forms or species are present in the Tertiary of America and 

 need careful study and separation rather than the general lumping 

 of all these under the one name of S. reticulata, as has been the usual 

 procedure. The following species is very different and distinct. 



Siphonina pulchra, new species. 

 (Plate 14, Figures 7 a to c.) 



The following is a description of this species : 



Test in front view nearly circular, rotaliform, composed of numerous cham- 

 bers in several whorls, in end view much compressed, widest in the central 

 region. Thence gradually tapering to the subacute periphery; chambers 

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

 which is somewhat more clearly defined by the slightly 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 lip with a distinct, extended border, aperture itself 

 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 linear; diameter about 1 mm. 



Type specimen from Cuba, station 3461, in marl from gorge of 

 Yumuri River, near Matanzas. 



This is a much larger species than the other of the same genus that 

 occurs with it and here referred to S. reticulata. S. pulchra has no 

 fimbriated periphery and practically no keel, which with its larger size 

 and peculiar ornamentation will serve to distinguish it. 



