

PR0CEED1X0S OF THE Vir/ovi/. MUSEUM. 



vni.. ::v 



dually in the outer half of the pinnules; there are large covering 

 plates, IhiI no definite side plates. The pinnules are 17 or 18 mm. 

 long in the middle and outer pari of the arm, somewhal shorter 

 proximally; the firsl pinnule is on the second brachial. 



Color (in life). "Brilliant uniform scarlet" 

 (F. M. Chamberlain). 



Type-specimen. Cat. No. 24308, Q.S.N.M., 

 from Albatross station 5439. 



The genus Proisocrinus is most nearly related 

 to Carpenterocrinus, a genus which I created not 

 long ago for the reception of the curious species 

 called hv Carpenter Pentacrinus mollis. This 

 species is very imperfectly known, the iyy^' and 

 only known specimen being a mutilated calyx 

 with a few columnars attached which is now in 

 the British Museum. The characters which it 

 presents appear to warrant generic differentiation from Proisocrinus 

 ruberrimus, though undoubtedly the two are closely allied, li is 

 interesting to note that both in Carpenterocrinus and Proisocrinus 

 one of the rays is smaller than the other four. 



Fig. 3. 



ABOVE Tl I.K OF 



THE SI EM. 



