276 REPORT OF NATIONAL MUSEUM, 1897. 



smooth; color light gray; aperture at the end of the final segment. 

 Length, about 1.5 mm. (-^ inch). 

 Locality. Portland, Maine, 4 to 5 fathoms. 



HAPLOPHRAGMIUM FOLIACEUM Brady. 

 (Plate 19, fig. 6.) 



Flat on both sides and extremely thin, the early spiral convolutions 

 quite distinct, the rectilinear segments broad and with sutural lines 

 evident; walls smooth and built of rather coarse sand; color reddish- 

 brown; aperture a terminal slit. Length, about 1.25 mm. (^ inch). 



Localities. Gulf of Mexico and off Marthas Vineyard (stations 2377, 

 2568), 210 and 1,781 fathoms. 



HAPLOPHRAGMIUM EMACIATUM Brady. 

 (Plate 19, fig. 5.) 



Thin, flat, nearly circular in outline, consisting of about two convo- 

 lutions made up of numerous segments; lines of union of the segments 

 more or less indistinct; walls composed of sand, or of sand and sponge 

 spicules mixed, or sometimes almost wholly of broken sponge spicules 

 arranged in an orderly manner parallel to the spiral axis of growth ; 

 color brown ; aperture a transverse arched slit at the base of the final 

 segment. Diameter, about 1 mm. (^ inch). 



Localities. West coast of Cuba, and off coast of Brazil, (stations 2352, 

 2760), 463 and 1,019 fathoms. 



HAPLOPHRAGMIUM LATIDORSATUM Bornemann. 

 (Plate 20, fig. 1.) 



A simple planospiral shell of about three convolutions, the segments 

 rapidly increasing in size, the final convolution completely inclosing 

 the others. Contour subglobular, septal lines distinct; aperture a 

 slightly irregular transverse slit at the base of the final segment, with 

 thin, well-formed lips; color grayish-brown. Diameter, about 1.5 mm. 

 (-iV inch). Section shows the arrangement of chambers, and the thick, 

 rather coarsely arenaceous walls. 



Localities. Off Nantucket Shoals and Gulf of Mexico (stations 2041, 

 2352, 2385, 2586), 300 to 1,600 fathoms. 



HAPLOPHRAGMIUM SCITULUM Brady. 

 (Plate 20, fig. 2.) 



A planospiral shell of about three convolutions, somewhat flattened 

 on both sides, depressed at the center, the outer convolution more or 

 less completely concealing the others; walls composed of rather fine 

 sand, firmly and smoothly joined; color light brown; aperture as in 

 H. latidorsatum. Diameter, about 0.625 mm. (-^ inch). Section shows 

 thin walls, and series of chambers in three convolutions. 



