LOGAN: SOME NEW CIRRIPED CRUSTACEANS. 189 
surface marked by striations, moderately indented in the type 
specimen; height ro mm.; greatest breadth 4 mm. Superior 
laterals triangular, with the apex rounded; convex overlapping 
scuta in the single specimen; height 9 mm., breadth at base 13 
mm. Scuta shorter than the superior laterals, their edges slightly 
rounded; moderately convex; triangular with the apex truncated; 
height 8 mm., breadth at base 3 mm. Carino-lateral in position, 
its general shape triangular, with the apex truncated by a line par- 
allel with the base, which is inclined at an angle of thirty degrees 
towards the base of the capitulum; height ro mm.; breadth at base 
2mm. Carina long, narrow, rounded; height ro mm.; breadth at 
base, 2 mm. Peduncle composed of nine rows of plates; plates 
narrow, 1 mm. in breadth and 4 mm. in length, with about thirty 
plates in each row; plates turned downward at end, grooved along 
central line. Height of specimen 27 mm.; height of capitulum ro 
mm. Weight of peduncle 17 mm. 
The type specimen attached to an ostrea congesta by the ex- 
tremity of its peduncle. It was discovered by Professor Haworth 
and placed provisionally in the genus Pollicipes by Professor Wil- 
liston in the work cited. Its horizon is the Yellow Chalk from the 
vicinity of Gove City in Gove county. 
Stramentum tabulatum, n. sp. 
Capitulum composed of eight plates, viz.; terga (2), scuta (2), 
lateralia (4); height 5 mm., breadth 7mm. The plates are flat 
and marked by lines and the whole capitulum is short and pointed. 
Terga triangular, the longest side of the triangle adjoining the 
carino-lateral, the shortest side adjacent to the superior lateral; 
breadth at base 2 mm., height 5 mm. Scuta small, but one half 
the size of the terga; triangular, almost equilateral. Carino- 
lateral long, moderately narrow, triangular, the most acute angle at 
the apex, height and breadth about the same as those of the targa. 
Superior laterals small, in the form of an isosceles triangle and of 
about the size of the scuta. Peduncle short, rounded, composed 
of six, or possibly seven rows of plates, with about sixteen plates 
in each row; plates less than 1 mm., in width, their length more 
than 2 mm.; turned downward at the ends and overlapping in rows. 
Type specimen collected by Mr. H. T. Martin from the Upper 
Niobrara Chalk of the Smoky Hill River. 
