334 PROCEEDINGS OP THE ACADEMY OP [1881. 



rim, the latter spread out an inch and more all around, while the 

 main branches reach a length of two inches and a-half. 

 We place here the following species : — 



1859. Strotocrinus glyptus Hall. (Actinocr. glyptus) Supp. Geol. Rep. Iowa, p. 2 ; 



Meek and Worthen, Strotocr. glyptus (Sect. A), Geol. Rep. 111., ii, p. 190. 



Upper Burlington limestone. Burlington, Iowa. This is not a Syn. of Ac- 



tinoor. erodus Hall as supposed by Meek and Worthen. 

 1869. Strotocr. perumbrosus Hall. (Actinocr. perumbrosus). Supp. Geol. Rep. 



Iowa, p. 7; Meek and Worthen, Strotocr. perumbrosus (Sect. A), (4eol. Rep. 



111., ii, p. 190; also Ibid., v, p. .S67, PI. 8, fig. 4. Upper Burlington lime.«t. 



Burlington, Iowa. This is probably a Syn. of Strotocr. regalis. 

 1869. Strotocr. regalis Hall. (Actinocr. regalis) Supp. Geol. Rep. Iowa, p. S ; 



Meek and Worthen, 1866, Strotocr. regalis, Geol Rep. 111. it, p. 192. Upper 



Burlington limest. Burlington, Iowa. 

 Si/ii. Actinocr. speciosus Meek and Worthen, 1860, Proc. Acad. Nat. Sci. Philn., 



p. .386. (Meek acknowledged it to be a Syn. of Strotocrinus regalis in 



1866). 

 Syn. Strotocr. Bloomfieldensis S. A. Miller, 1879, Jour. Cincin. Soc. Nat. 



Hist, vol. ii, PI. 16, fig. 6. 



21. GENN.a:OCRINUS. Nov. Gen. 

 {yevvaJoc, of noble origin, nplvov, a lily). 



We propose the above name for a little group of Crinoids from 

 the Upper Devonian, which cannot be satisfactorily referred to 

 an}'^ established genus. In their general construction they closely 

 resemble Actinocrinus and Physetocrinus, but differ from both, 

 and in fact from all Actinocrinites, in the arrangement of the anal 

 plates. The anal area has in the second series, like all other Ac- 

 tinocrinidfB, previous to the Subcarboniferous, three plates in 

 place of two, agreeing therein with the Batocrinites, from which 

 they differ, however, in the much greater number both of anal and 

 interradial plates, the different arrangement of these plates, 

 which form an unbroken line with the interradial vault pieces, the 

 presence of interaxillaries, the strongly lobed form of the body, 

 the mode of bifurcation, and in other characters. It is possible 

 when the construction of the vault and arms are better known, 

 that Gennseocrinus should be placed subgenerically either under 

 Actinocrinus or Physefocrimis. 



Generic Diagnosis — General form of body wider than high, 

 lobed at the arm regions ; calyx beautifully striated, the higher 

 radials formed into ridges and resembling fixed arms ; vault low 

 hemispherical, composed of small, spiniferous or nodose plates. 



