268 PROCEEDINGS OF THE ACADEMY OP [18?9. 



much the largest; while Taxocrinus has two series of anals and 

 several interradials. The three underbasals are comparatively 

 large in both groups. Angelin's descriptions of both genera are 

 short, and give us but little additional information regarding their 

 relations; on the contrary they rather increase the difficulty, as 

 none of his species of Taxocrinus or Forbesiocrinus are true rep- 

 resentatives of either, thus raising the question whether the Swe- 

 dish species ought not to be considered as types of new genera, 

 or at least be separated subgenerically. We prefer the latter 

 course, and propose Gnorimocrinus for the former, and Lithocri- 

 nus for the latter. 



Phillips in proposing the genus Taxocrinus included in it the 

 following species, in the order in which we give them, viz., Poterio- 

 crinus Egertoni Phill. 2. Cyathocrinus tuberculatum Miller. 1 

 3. Cyathocrinus macrodactylus; and 4. Cyathocrinus nobili* 

 Phill. The first of these, a subcarboniferous species, with no or 

 but few interradials, must be considered, according to the most 

 generally accepted rules of naturalists, the type of the genus. The 

 second and third species have but one or two interradials, T. tuber- 

 culatus, according to Pictet's figure, one or two anals resting on 

 the upper truncated side of the large basal. The fourth species 

 was Koninck & Lehon's type of their genus Forbesiocrinus. 



Now comparing the anal arrangement of the latter or rather 

 of Forbesiocrinus Agassizi Hall, which undoubtedly belongs to the 

 same group, and in which these parts are better known we find 

 the large basal not truncated, and the anal series which rests di- 

 rectly upon it almost identical in construction with the interra- 

 dial series, except that it is slightly broader, and that it consists 

 of a few more plates. We also find in that species a considerable 

 number of axillary pieces, which extend up to the top of the ter- 

 tiary radials where the arms become free. 



Referring to Taxocrinus, or to species with but few interradials, 



1 Roemer, 'considering Miller's genus Cyatlwcrinus not distinct from 

 Poteriocrinus, proposed in 1851 (Foss. Fauna d. Devon. Gebirges a. Rliein, 

 p. 8), and again in 1855 (Lethtea Geognostica, Ausgabe III. p. 238), that 

 all species hitherto placed under Phillips' Taxocrinus, be arranged under 

 Cyatlwcrinus with C. tuberculatum Miller's second species as type, and 

 the generic formula amended accordingly. The genus Cyathocrinus, how- 

 ever, with Miller's first specios C. planus as type, has been accepted by 

 almost every other paleontologist. 



