CLARK] NEW GENERA OF RECENT FREE CRINOIDS 361 



genital glands; distal pinnules (as well as, to a greater degree, the 

 proximal) stout, prismatic, the segments but little longer than wide; 

 terminal pinnules short, not extending beyond the tip of the arm, 

 which is not incurved. 



Color in life yellow or brownish yellow, sometimes more or less 

 marked with white, rarely grayish brown, or gray with the tips of 

 the arms yellow. 



Type of the genus. — Antedon incisa P. H. Carpenter, 1888. 



Charitometra is composed of most of the species included by Dr. 

 Carpenter in the "Basicurva," "Spinifera," and "Granulifera" 

 groups, not falling in the genus Tlialassomctra, with a few others 

 subsequently described, and a number of as yet undescribed forms 

 which I have examined, mostly from the Caribbean Sea. The genus 

 is mainly tropical, but occurs southward to South Africa and the 

 Australian seas, and northward to southern Japan. The following 

 described species are included in the genus : 



Charitometra aculcata (P. H. Carpen- Charitometra hepburniana (A. H. 

 ter) Clark) 

 angusticalyx (P. H. Car- inccqualis (P. H. Car- 

 penter) penter) 

 " basicurva (P. H. Car- " incisa (P. H. Carpenter) 

 penter) " lata (A. H. Clark) 

 brevipinna (Pourtales) orion (A. H. Clark) 

 " compressa (P. H. Car- parvipinna (P. H. Car- 

 penter) penter) 

 distincta (P. H. Car- " patula (P. H. Carpen- 



penter) ter) 

 fiexilis (P. H. Carpen- " pourtalesi (P. H. Car- 

 ter) penter) 

 " garrettiana (A. H. " robusta (P. H. Carpen- 

 Clark) ter) 

 granulifera (Pourtales) tuberosa (P. H. Carpen- 

 ter) 



16. PCECILOMETRA, gen. nov. 



Centro-dorsal hemispherical, subconical, or columnar, bearing 20 

 to 30 cirri; cirri with 15 to 18 smooth segments, nearly all of which 

 are longer than wide ; no opposing spine ; terminal claw small and 

 sharp ; disk completely plated ; ambulacra plated ; radials quite con- 

 cealed in the adult; costals with a thin projecting latero-posterior 

 border, causing them to appear scale-like ; costals and lower brachials 

 sharply flattened laterally, the former more or less concave, but not 

 in apposition ; ten arms, the brachials as long as or longer than wide, 

 triangular, becoming quadrate distally ; first pinnule with 20 to 30 



