26 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Description. — Test biconvex, the edges becoming somewhat thicker 

 as growth progresses, tubular portion of nearly equal height through- 

 out, slightly embracing; wall smooth except for occasional slight 

 varices of growth; aperture nearly the size of the open end of 

 the tube. 



Diameter 1 mm. or slightly more. 



Distribution. — Brady notes the occurrence of this species in the 

 North Pacific, but gives no definite stations. Bagg records it from 

 two stations off the Hawaiian Islands, Albatross D4017 and D4174 

 in 305 and 735-865 fathoms, respectively. His material which I 

 have examined is typical. 



In the material I have had there are specimens from Albatross 

 station 3608 in 276 fathoms off the Galapagos, Nero 2071 in 271 

 fathoms off the Hawaiian Islands, D4900 in 139 fathoms, and D4875 

 in 59 fathoms off Japan. The specimens from D4900 were larger 

 and finer than those from the other stations. 



In the Tuscarora material this species has occurred at the following 

 stations: 5, in 1,200 fathoms, latitude 37° 04' N.; longitude 123° 

 22' W.; 11, in 437 fathoms, latitude 33° 46' N.; longitude 140° 21' E.; 

 and 42, in 108 fathoms, latitude 27° 16' N.; longitude 141° 56' E. 



Both microspheric and megalospheric forms of the species occur, 

 the microspheric speoimens being considerably larger than the 

 megalospheric. 



CORNUSPIRA LACUNOSA H. B. Brady. 



Plate 2, fig. 3. 



Cornuspira lacunosa H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 202, pi. 113, fig. 21. 



Description. — "Test discoidal, biconcave, peripheral edge rounded; 

 convolutions numerous, narrow near the center; aperture dome- 

 shaped; surface decorated, especially on the outer whorls, with a 

 series of irregular, anastomosing costae, the main lines of which are 

 more or less parallel to the axis of growth. Diameter one fiftieth 

 inch (0.5 mm.) or rather more." 



Distribution. — Brady described this species from Challenger station 

 185, off Raine Island, Torres Strait, in 155 fathoms. It seems to be 

 a rare species to judge from the absence of data. From Albatross 

 station D4900 in 139 fathoms off Japan where many species allied 

 or identical with those of the Torres Strait region occur there were 

 obtained several specimens referable to this species. They are very 

 different, however, in certain characters. The early portion is 

 undoubtedly identical with the species figured by Brady but in the 

 larger specimens which show the later development there is a modifi- 

 cation of the ornamentation. In the last-formed coil there is a loss 

 of the lacunose ornamentation and the wall is nearly smooth except 

 for very definite but fine longitudinal striae. The last-formed whorl 



