DESCRIPTIVE CATALOGUE OF RECENT FOKAMINIFERA. 283 



Family IV. TEXTULAKID^. 



Tests of the larger species arenaceous, either with or without a per- 

 forate calcareous basis; smaller forms hyaline and conspicuously per- 

 forated. Chambers arranged in two or more alternating series, or 

 spiral, or confused; often dimorphous. 



Typically bi- or tri-serial; often bi-, rarely tri -morphous. 



Genus TEXTULARIA. 



Segments in two rows, alternating with each other; normal aperture 

 an arched slit at the base of the inner wall of the final segment. 



TEXTULARIA QUADRILATERA Schwager. 

 (Plate 28, fig. 3.) 



Elongate, compressed, tapering, quadrilateral, the two broader faces 

 concave, the angles prominent and sharp, both ends rounded; made 

 up of a double alternating series of segments to the number of seven, 

 more or less, in each row ; aperture simple, near the base of the last 

 segment; structure hyaline and minutely perforate. Length, about 

 1 mm. (^g inch). 



Locality. — Specimens taken near Aspinwall, Isthmus of Panama 

 (station 2141), 896 fathoms. 



TEXTULARIA TRANSVERSARIA Brady. 



(Plate 28, fig. 4.) 



Elongate, compressed, tapering, the broad faces convex, the angles 

 thin ; composed of a double row of chambers placed transversely to the 

 long axis of the shell, many of them open at the peripheral end, giving 

 a serrated appearance to the edge of the test. Length, about 0.75 mm. 

 (sV inch). 



Locality. — Off Carysfort Light, Florida (station 2641), GO fathoms. 



TEXTULARIA CONCAVA Karrer. 



(Plate 28, fig. 5.) 



Short, compressed, rapidly tapering, lateral faces flattened or concave, 

 edges either square or rounded, angles full or rounded; texture rather 

 roughly arenaceous; aperture a transverse arched slit with slightly 

 protruding lips at the inner margin of the last segment. Length, about 

 1 mm. (- 2 \ inch). Readily distinguished from T. quadrilatera by the 

 arenaceous texture of its walls. 



Localities. — Off the island of Old Providence and off Carysfort, 

 Florida (stations 2150, 2041), 382 and 00 fathoms. 



