46 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



ventral side with the sutures very similar to those of A. angulata; the umbilicate 

 region solid, with clearer shell material; surface of test granular throughout, 

 opaque, causing the sutures on both sides to be indistinct; aperture ventral, 

 elongate. 

 Diameter, 1 to 1.25 mm. 



This species was found in considerable numbers at Zone G, Rio 

 Gurabo, Santo Domingo. It differs from A. angulata in its rounded 

 periphery, granular, opaque surface, broadly rounded ventral side, 

 and inconspicuous sutures. 



Asterigerina tuberculata, new species. 

 (Plate 13, Figures 3, 4.) 



The following is a description of this species: 



Test free, rotaliform, biconvex, becoming truncate and short cylindical, 

 peripheral angle in young subangular, becoming rounded in the adult, outline 

 regular in the early stages, in the adult becoming lobed, especially in the last 

 few chambers; dorsal surface rather flat, slightly convex, conspicuously pitted 

 or scrobiculate, last-formed coil narrow, making only the extreme peripheral 

 portion in the adult on the dorsal side; ventral side with large tubercles or 

 knobs developed near the peripheral border, remainder of surface with coarse 

 granulations; in some specimens the height of the test equals its diameter and 

 the ventral and dorsal sides are nearly parallel; the periphery high and 

 flattened to make a short cylindical test; sutures as typical in the genus; 

 aperture ventral, narrow. 



Diameter up to 2 mm. 



Specimens were obtained from Zone I, Rio Cana, and a single one 

 from Zone 3, Cercado de Mao, Santo Domingo. 



This is a peculiarly ornamented and shaped species, the change in 

 outline during development being very marked, as is the very strongly 

 tuberculate ornamentation. 



Carpenteria americana, new species. 



Fig. 4. — Carpenteria americana new speoies. Transverse section of a specimen showing deeply- 

 pitted surface of shell tissue surrounding chambers. X 35. From station 7518, 

 south side, near west end, Los Melones Mountain, Cuba. 



The following is a description of this species: 



Test attached, composed of several subglobular chambers forming an 

 irregular Globigerina-like mass, the base conforming to the object to which 



