360 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 50 



Thalassometra acutiradia (P. H. Car- Thalassometra latipinna (P. H. Car- 



penter) 

 agassici (Hartlaub) 

 alboftava (A. H. Clark) 

 aster (A. H. Clark) 

 bispinosa (P. H. Car- 

 penter) 

 breviradia (P. H. Car- 

 penter) 

 diadenia (A. H. Clark) 

 duplex (P. H. Carpen- 

 ter) 

 echinata (P. H. Car- 

 penter) 

 liana (A. H. Clark) 

 hawaiiensis (A. H. 



Clark) 

 incerta (P. H. Carpen- 

 ter) 



penter) 



lust tanica (P. H. Car- 

 penter) 



multispina (P. H. Car- 

 penter) 



per gracilis (A. H. 

 Clark) 1 



pubescens(A. H. Clark) 



quinquecostata (P. H. 

 Carpenter) 



spinicirra (P. H. Car- 

 penter) 



spinifcra (P. H. Car- 

 penter) 



valida (P. H. Carpen- 

 ter) 



villosa (A. H. Clark) 



zvood-masoni (Bell) 



15. CHARITOMETRA, gen. nov. 



Centro-dorsal usually discoidal, rather thick, rarely low-conical or 

 low-hemispherical, the comparatively few cirri usually without defi- 

 nite arrangement ; cirri short and stout, with less than 30 segments, 

 very uniform in length, about as long as or slightly longer than 

 wide, not bearing dorsal spines, although the later joints are some- 

 times tubercular dorsally; an opposing spine always present; disk 

 well, or at least moderately, plated, the ambulacra always well plated ; 

 costals and lower brachials strongly flattened against each other 

 laterally, sharply "wall-sided ;" distichals and palmars either 2 or 4 

 (3 -f- 4), the latter often 2 (1 -)- 2) ; ten to about fifty arms, long, 

 always more or less (often much) compressed, at least in the outer 

 half, and carinate ; first syzygy between the third and fourth brachial 

 in arms springing direct from the costal axillary, or from an axillary 

 joined to the preceding segment by bifascial articulation, but be- 

 tween the first and second in arms arising from an axillary joined 

 to the preceding segment by syzygy; distal syzygia irregularly dis- 

 tributed; first pinnule (which in Thalassometra is much stouter and 

 larger, with larger joints than its successors) rather slender, often 

 more or less flagellate, always less stout than its successors, and com- 

 posed of more numerous and shorter joints ; genital pinnules always 

 have one or more of the joints more or less expanded, protecting the 



^Antedon pergracilis; new name for Antedon gracilis P. H. Carpenter. 1888, 

 preoccupied (cf. Antedon gracilis de Loriol, 1886). 



