2t6 PROCEEDINGS OF THE ACADEMY OF [1881. 



1878. Patelliocr. pachydaotylus Angelin (type of the genus). Iconogr. Grin. Suec, 



]<. 1, PI. 16, figs. 24, 25. Upper Silur. Gothland, Sweden. 

 1878. Patelliocr. pinnulatus Angelin. Iconogr. Crin. Suec, p. 2, PI. 24, fig. 5 and 



PI. 26, fig. 18. Upper Silur. Gothland, Sweden. 

 1878. Patelliocr. plumulosus Angelin. Iconogr. Crin. Suec, p. 2, PI. 22, figs. 8, 9. 



Upper Silur. Gothland, Sweden. 

 1878. Patelliocr. punctuosus Angelin. Iconogr. Crin. Suec, p. 2, PI. 23, fig. 26. 



Upper Silur. Gothland, Sweden. 

 The two following species, which were described by Angelin under this genus, 



cannot be brought with satisfaction under this or any other established 



generic form. 

 (?) 1878. Patelliocr. duplicatus Angelin. Iconogr. Crin. Suec, p. 1, PI. 19, fig. 5. 



Upper Silur. Gothland, Sweden. 

 (?i Patelliocr. fulminatus Angelin. Iconogr. Crin. Suec, p. 2, PI. 26, figs. 14, 14 



a b. Upper Silur. Gothland, Sweden. 



4. MACROSTYLOCRINUS Hall. 



1852. Hall. Paleout., New York, vol. ii, p. 203. 



1863. Hall. Trans, Albany Inst., p. 207. 



1879. Hall. 28tli Rep. New York St. Cab. Nat. Hist. (2d ed.), p. 129. 



1879. Zittel. Handb. der Paleout., p. 368. 



This genus has been frequently identified with Gtenocrinus 

 Bronn,^ and with Gytocrinus Roemer.^ 



It has been shown, however, by Schultze (Mon. Echin, Eifel 

 Kalk, p. 62), that Gtenocrinus has four, and not three or five 

 basal plates as supposed by previous authors,^ and we can state 

 positively, that we have also found four instead of three in Cyto- 

 crinus lasvis Roemer. This discovery leaves no doubt tliat the 

 two genera are identical with each other, as well as with Melo- 

 c/'irtHs Goldfuss, but distinct from Macroatylocrinus. 



In the construction of the calyx, Macrostylocrinus resembles 

 the preceding genus, the two varying only in the proportionate 

 size of the different plates ; but this gives them a totally' diff'erent 

 appearance. 



In its general habitus 3Iac7'ostylocrinus approaches the PeriecJio- 

 crinites, while Patelliocrinus is a step in the direction of the 

 Agaricocrinites. *We are sure that the vault of Macrostylocrinus 

 when found, will prove to be constructed of a great number of 

 minute pieces, while we shall expect in Patelliocrinus a summit 



^ Broun' s Jahrbucb, 1840, p. 253. 

 2 Silur. Fauna, West Teun., p. 46. 

 ^ Compare our notes on Melocrinus. 



