40 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



TROPIOMETRA PICTA (Gay) 

 Antedon diibeni 1888. P. H. Carpenter, "Challenger" Report, Comatulae, 



p. 181 (1). 

 Antedon carinata 1888. P. H. Carpenter, T. c, p. 199 (2, 3, 4)-— Bwt. Mus., 



MS. (5,7,8). 



1. Bahia; 20 fathoms; " Challenger."— One young specimen. 



2. Bahia; 7-20 fathoms; " Challenger."— -Eleven specimens. 



3. Rio de Janeiro. — Three specimens. 



4. St. Helena; E. W. Alexander.— Two fine specimens ; there are 

 twentv-five cirrus segments. 



5. Rio de Janeiro; Charles Darwin.— One large specimen. 



6. Thirty-three miles east of Pcrnambuco; 23 fathoms— Three 

 specimens. 



7. No Locality. — Four specimens. 



8. No Locality. — One specimen. 



Family CALOMETRIDiE A. H. Clark 



Genus OREOMETRA A. H. Clark 



OREOMETRA MARINE A. H. Clark 



Antedon macroncma Brit. Mus., MS. 



Description.— The centrodorsal is thick discoidal, bearing a single 

 fairly regular marginal row of cirrus sockets ; the broad flat polar 

 area is 4 mm. in diameter. 



The cirri are XV, 4 4"47, 25 mm. to 27 mm. long, rounded rhombic 

 in cross section, suggesting the cirri of Neometra acanthaster, but 

 with the angles, as seen in cross section, less sharp and more 

 rounded ; all the segments are approximately equal, about twice as 

 broad as long; the ventral and lateral distal edges of the segments 

 project rather strongly over the bases of those succeeding; the cirri 

 taper slightly in the outer half : on about the fourth segment a faint, 

 very narrow longitudinal median ridge is visible; after the middle 

 of the cirrus this becomes a narrow, low, sharp carination, slowly 

 increasing in height distally so that terminally the segments bear 

 fairly prominent rounded dorsal spines ; in the distal third of the cirri 

 supplementary spines appear, one on either side of the median carina- 

 tion, at first small and confined to the vicinity of the distal edge of 

 the segments, but becoming terminally nearly as large as the median 

 spine ; the spine on the antepenultimate segment is single ; the oppos- 

 ing spine is transversely flattened. As a whole the cirri are moder- 

 ately stout, suggesting strongly those of Neometra spinosissima. 



