298 REPORT OF NATIONAL MUSEUM, 1897. 



MILIOLINA AUBERIANA d'Orbigny. 

 (Plate 43, fig. 6.) 



Larger than M. seminulum, and with the margins of the segments 

 more sharply angular. Section shows the triangular contour of the 

 shell and the characteristic milioline arrangement of the chambers. 



Localities. — Atlantic coast of the United States, off the island of 

 Trinidad, and off the coast of Brazil (stations 3150, 2570, 2584, 2754, 

 2760), 400 to 1,800 fathoms. 



MILIOLINA CUVIERANA d'Orbigny. 

 (Plate 43, fig. 1.) 



A rather large, smooth-shelled variety, characterized by the acutely 

 angular margins of the five visible segments. 



Localities. — Coast of Brazil (station 2762) and the Gulf of Tokyo, 59 

 and 9 fathoms. 



MILIOLINA VENUSTA Karrer. 



(Plato 44, fig. 2.) 



Oval, angular, the margins of the three final segments extended so 

 as to form well-marked keels; oval extremity of the last segment gen- 

 erally protuberant. Length, about 0.625 mm. (-^ inch). 



Localities. — West coast of Patagonia (station 2784) and Gulf of Tokyo, 

 194 and 9 fathoms. 



MILIOLINA CIRCULARIS Bornemann. 



(Plate 44, fig. 1.) 



Smooth, slightly compressed, nearly circular in broadest outline; 

 chambers inflated; aperture a crescentic slit with arched upper and 

 thin projecting lower lip. Length, about 0.75 mm. (^ inch). 



Localities. — Off Cape Hatteras, west coast of Cuba, and Trinidad 

 (stations 2115, 2353, 2754), 167 to 8S0 fathoms. 



MILIOLINA TRIGONULA Lamarck. 

 (Plate 44, fig. 3.) 



Oblong, broad, oval in end view, exposing two chambers on one side 

 and three, rarely four, on the other; oral end of the final segment often 

 tubular; aperture round, with T-shaped valvular tooth. Transverse 

 section of a broad specimen shows arrangement of the chambers. 



Localities. — Atlantic coast of the United States and the Gulf of 

 Mexico (stations 2228, 2570, 2385), 700 to 1,800 fathoms. 



MILIOLINA TRICARINATA d'Orbigny. 

 (Plate 44, fig. 4.) 



Distinctly triangular in end view, the three angles thickened and 

 slightly produced or keeled. Two of the angles are formed by the last 



