542 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



ing increase rapidly to the tenth and following, which are six times as long as 

 broad. The median narrow girdle is distinct in all, but projects only in the first six. 



Five large infrabasals are clearly present. 



The basals foi-m a broad cup which is more than half again as broad as high. 



The five radials, rhombic or triangular plates of considerable size, are present, 

 and in some cases a IBri is present beyond them. 



The oval radianal, conspicuous as usual by its fine reticulation, is not mucli 

 smaller than the radial to the right of it; the left side of this radial is cut away 

 beyond a line running from the left side of the base of the IBr, obliquely (to 

 the right) downward to the interbasal suture. The right distal margin of the 

 posterior basal is also slightly cut away. The radianal extends from the line of 

 contact between the posterior and right posterior basals and orals as far as a 

 point about three-fourths of the distance between the distal right-hand angle 

 and the median apex of the posterior basal. 



The orals, which are unusually long and narrow, are slightly longer than the 

 basals; they are of the usual shape. 



No. 18 (figs. 896-898, p. 538) : Dredged on December 19-23, 1902, at a depth 

 of 385 meters. 



This specimen was treated with caustic potash to determine the presence of 

 infrabasals, which were found to be rounded in outline when viewed from the 

 exterior of the calyx and triangular in outline when viewed from the interior. 



No. 19 (figs. 899-902, p. 538) : Dredged on February 7, 1903, in 350 meters. 



A column without the crown, about 5.5 mm. long. 



This column consists of 22 segments, of which the first four are short and 

 discoidal, the fifth and sixth are twice as long as broad, the ninth-seventeenth 

 are between five and six times as long as broad, and the distal become shorter 

 again. In all the median girdle can be made out, though in the terminal it 

 becomes very inconspicuous. 



The terminal stem plate is much broken, but it appears to have been deeply 

 lobate. 



Attached to the proximal portion of the column are portions of the basals 

 and five small rounded infrabasals. 



No. 20 (fig. 903, p. 538) : Dredged on July 31, 1902, at a depth of 385 metere. 



A crown with the proximal portion of the column. 



This specimen closely resembles No. 28, but the radials are only about half 

 as long, though just in apposition laterally, and the orals are more pointed distally. 



The IBr, and IBr, are present. 



No. 21 (figs. 904-906, p. 538) : Dredged on June 25, 1902, in 385 meters. 



There are 28 columnals. 



The basal cup is low and very broad. 



The radials are large and rhombic, almost in contact by their lateral angles. 



The left side of the right posterior radial, beyond a line extending from the 

 left-hand base of the IBr, to a point about midway between the central apex 

 and the right-hand border of the posterior basal, is occupied by the oval radianal. 



Beyond the IBrj about four brachials are present. 



