1874.] 245 [Pourtales. 



from the under surface which, on both wings, is fuscous, paler than 

 the hind wings above. 



Expanse, 32 mm. 



Colorado Territory (Mr. Mead, No. 25). 



January 21, 1874. 



The President in the chair. Fifty-seven persons present. 



Mr. L. F. Pourtales exhibited a specimen of Holopus 

 JRangii d'Orb., belonging to Governor Rawson of Barbados, 

 and by him lent to Prof. Agassiz for description. 



It is the second specimen of this curious Crinoid known ; the first 

 one having been obtained by Mr. Rang at Martinique, about 1836, 

 and described and figured by d'Orbigny. The original specimen 

 could not be found in d'Orbigny's collection by Dujardin and Hupe, 

 and doubt has been thrown on its affinities. Gov. Rawson's speci- 

 men was brought up on a fisherman's hook at Barbados, somewhat 

 damaged, having lost four arms. It agrees in most particulars with 

 d'Orbigny's specimen except that it has ten arms, instead of eight, 

 and is therefore more normal. That it is a true Crinoid there can be 

 no doubt, from the most cursory inspection, but it is of a type which 

 can find no place in any of the known families. Figures, and a brief 

 description of the specimen, will shortly appear among the publica- 

 tions of the Museum relating to the Hassler Expedition. 



Mr. Pourtales took occasion to exhibit at the same time specimens 

 of the other Crinoids belonging to the Museum of Comparative Zool- 

 ogy, which now possesses all but one of the living Crinoids known, 

 the exception being Bathycrinus gracilis, Wyville Thomson. The 

 list comprises Pentacrinus Asteria L., P. Mulleri Oerstd., P. Wy- 

 ville- Thomsoni Jeffreys, Rldzotroclius lofottensis Sars., Rh. Raiv- 

 sonii, Pourt., the latter a new species, the description of which is 

 in the press. 



Mr. Pourtales also remarked that the characters assigned by 

 by Liitken to distinguish P. asteria and P. Mulleri are far from con- 



