330 PROCEEDINGS OP THE ACADEMY OP [1885. 



tends from the upper sloping sides of the first primary radials to 

 the first plate of the secondary radials. The second plate is 

 much smaller, though yet comparatively large ; it is hexagonal, 

 and placed upon the first interradial and between the two second- 

 ary radials. There are two more interradial pieces above, which, 

 like the two former, are longitudinally arranged. This arrange- 

 ment is uniform in all five areas. 



Interaxillary plates, one or two ; the upper one cuneate, and 

 inserted like the upper interradials between the tertiary radials. 

 Construction of the plates of the ventral side unknown. The 

 column is large, round, composed of low segments ; articular 

 faces provided with radiating striae, except upon a small zone 

 next to the periphery ; central canal pentalobate. 



Geological position, etc. — Gorymbocrinus is only known from 

 the Upper Silurian of England and Gothland. 



Angelin refers to it the following species : 



I Mo. Corymbocr. corolliferus Hisinger (Cyathocr. (?) corolliferus). Lethaja. Suec. 

 Suppl. sec, p. 6, PI. 39, fig. 3, a-c. Angelin, 1878.— Corymbocr. corollife- 

 rus, Iconogr. Crin. Suec, p. 18, PI. 23, fig. 19. — Upper Silurian. Gothland, 

 Sweden. 



1 878. Corymbocr. grandis Angelin. Iconogr. Crin. Suec, p. IS, PI. 9, figs. 2, 3. — Up- 

 per Silurian. Gothland, Sweden. 



187S. Corymbocr. grandistellatus Angelin. Iconogr. Crin. Suec, p. 18, PI. 9, fig. 

 4, and PI. 23, figs. 18-21.— Upper Silurian. Gothland, Sweden. 



1878. Corymbocr. laevis Angelin. Iconogr. Crin. Suec, p. 18, PI. 23, fig. 20. — Upper 

 Silurian. Gothland, Sweden. 



L878. Corymbocr. Panderi Angelin. Iconogr. Crin. Suec, p. 18, PI. 9, fig. 5, and 

 PI. '!?>, figs. 17, 17 a, b. — Upper Silurian. Gothland, Sweden. 



1855. Corymbocr. polydactylus McCoy (Eucalyptocr polydactylus). Apud. Sedge 

 wick, Bynops. Pal. Foss., p. 58, PI. 1 D, fig. 2; also Sailer, 187.'!; Catal., p. 



120; Angelin, 1878. — Corymbocr. polydactylus, le >gr. Crin. Suec. p. L8, 



PL 9, figs. I, 6-12, and PL 21, fig. 17.— .Upper Silurian. Gothland, Sweden. 



Note. — It is possible that Mariacrinua macropetalus Hall, Paleont., N. 

 York, vol. iii, p. Ill, PI. 3 A, fig. 1, is a Corymbocrinus, but it may be a 

 Callicrinux in place of Mariacrinue, as which it was described. 



CiPOLYPELTES Angelin. 



1878. Angelin, Iconogr. Crin. Suec, p. 27. 



1879. Zittel, Handb. d. Paleont. i, p. 373. 



The genus Polypeltes was described as being composed of " 8 

 or more basals, 16 parabasals, 10 (?) X 1 radials (all axillary), 

 numerous interradial and interaxillary pieces, and as having 



