306 REPORT OF NATIONAL MUSEUM, 1897. 



LAGENA GLOBOSA Montagu. 

 (Plate 53, fig. 4.) 



Spherical, with a short conical protuberance ornamented with longi- 

 tudinal costre, body smooth, walls transparent, finely perforated, aper- 

 ture leading into a short internal neck (entosolenian). This description 

 applies to a single specimen from the Caribbean Sea near Aspiuwall 

 (station 2144), 896 fathoms. 



LAGENA LONGISPINA Brady. 

 (Plate 53, fig. 2.) 



Subglobular or pear-shaped ; surface smooth ; walls thin, glassy, more 

 or less transparent, finely perforated, furnished with several (two to six 

 or more) long, slender spines springing from the base of the shell; 

 aperture round, central, at the apex, opening into a long neck or tube 

 extending into the interior of the shell and terminating in a broadly 

 expanded margin. Length of body, about 0.6 mm. (/<> inch). 



Localities. Near Aspinwall, Gulf of Mexico, off Trinidad (stations 

 2144, 2394, 2754), 420 to 898 fathoms. 



LAGENA GRACILLIMA Seguenza. 

 (Plate 53, fig. 3.) 



A very delicate shell, with thin, transparent, and fragile walls and 

 smooth surface; body either cylindrical or fusiform, drawn out at each 

 end into along thin neck; apertures simple, terminating the tubular 

 neck at both ends of the shell, often surrounded at one end by an 

 everted lip like the mouth of a phial. 



Localities. Various stations along the Atlantic and Gulf coast of the 

 United States, at depths from 210 to 1.781 fathoms. 



LAGENA ELONGATA Ehrenberg. 

 (Plate 53, fig. 1.) 



Like L. gracillima, except that the body is long and cylindrical, with 

 a short taper at both ends. Length, about 2 mm. ($ inch). 



LAGENA DISTOMA Parker and Jones. 

 (Plate 53, fig. 5.) 



Like L. Gracillima in its variety of forms, but characterized by more 

 or less numerous, delicate, longitudinal stria? marking its surface. 



LAGENA L^VIS Montagu. 

 (Plate 53, fig. 6.) 



Minute, flask-shaped, straight or curved, with an oval, pyriform or 

 globular chamber and a more or less prolonged tubular neck; walls 

 generally very thin, smooth, and transparent, but sometimes the shell 



