DESCRIPTION OF SPECIES CRINOIDEA 287 



by a rather sharp radial ridge which is continued on the higher brachial 

 plates of the calyx. Basal plates very short and forming a flat, disk-like 

 base, or of moderate height; the radials about equal to the basals in size, 

 with three nodes arranged horizontally at their middle line or with a 

 single transverse node ; first costals about equal to or a little smaller than 

 the radials, hexagonal in outline, with a tendency to a trinodose orna- 

 mentation similar to that of the radials, the central node connected by a 

 ridge with the central node of the radial; second costal pentagonal, axil- 

 lary, strongly nodose, the node connected proximally with the central node 

 of the first costal and distally with the distichal plates ; distichals one in 

 each series, broader than high; palmers with one or two plates in each 

 series incorporated in the calyx; a deep V-shaped interdistichal groove 

 marks the median line of each ray distally; arm openings four in each 

 ray. Anal plate smaller than the radials, nodose, followed by two plates 

 in the second series and three in the third, all of which are usually nodose. 

 Interbrachial series consisting of three more or less strongly nodose plates, 

 one below and two above, and these usually followed by two elongate 

 plates between the bases of the rays. Ventral disk dome-shaped, much 

 higher, sometimes twice as high as the dorsal cup, slightly depressed 

 between the rays below, composed of numerous more or less nodose 

 polygonal plates, those occupying the ambulacral regions being the most 

 strongly nodose, some of the nodes almost assuming the form of short 

 spines ; anal opening almost central, with no anal tube. 



The dimensions of a large individual are: Height, 27.5 millimeters; 

 height of dorsal cup to arm openings, 10 millimeters ; greatest width, 34 

 millimeters. The dimensions of a smaller individual are: Height, 21 

 millimeters ; height of dorsal cup to arm openings, 7 millimeters ; width, 

 24.5 millimeters. 



Remarks. — This species is founded on the two nearly complete calyces 

 whose dimensions are given above, both of which were collected by 

 Mr F. A. Sampson. The two specimens differ somewhat in minor charac- 

 ters; the basals of the smaller individual are slightly higher and more 

 nodose; the nodes on the radials and first costals are more distinctly tri- 

 partite in the larger specimen ; the interradial depressions are relatively 

 broader in the smaller specimen, a feature which may be due to the age 

 of the individual. 



At the request of Mr F. A. Sampson this species has been named in 

 honor of Mrs C. T. Smalley, who has skillfully prepared many specimens 

 of crinoids in his collection, including the ones here described. 



