I,YS. MAR.] 



ECHINODERMA TA. 



259 



azygous area similar to the regular 

 interradial areas; vault almost flat, 

 depressed interradially, composed of 

 small plates ; opening excentric ; arms 

 10, composed of a double series of inter- 

 locking plates. Tvpe L. dactylus. 



dactylus, Hall, 

 1843, (Mar- 

 supiocrinites(?) 

 dactylus,) Geo. 

 Rep. 4th Dist. 

 N. Y., p. 114, 

 and Pal. N. Y., 

 vol. 2, p. 197, 

 Niagara Gr. 

 m e 1 i ssa, Hall, 

 1863, (Rhodo- 

 crinus melissa,) 

 FIG. 353. Lyriocrinus T Aih 



dactylus. Basal view. 1 ran S. Alb. 



Inst., vol. 4, p. 



198, and llth Rep. Geo. and Nat, 

 Hist, Ind., p. 269, Niagara Gr. 



FIG. 354. Lyriocrinus melissa. Basal view. 



sculptilis, Hall, 1864, 20th Rep. N. Y. St. 



Mus. Nat. Hist., p. 368, Niagara Gr. 

 sculptus, see 



Archseocri- 



nus sculp- 



tus. 



L Y S O CYSTITES, 



n . gen . 



[Ety. lysis, 



setting free; 



kustis, blad- 



der.] Body 



subsphe- 



roidal, com- 



posed of 



four ranges 



of plates ; 



basal plates 



probably 4, 



succeeded 



b y two 



ranges of 5 



plates each 



and dome 



plates; 



mouth cen- 



tral ; ova- 



rian aper- __ 



ture lateral. 



Fl - 355. Macrostylocrinus 

 '-ibrachiatus. 



generic name is proposed instead of 



Echinocystites, Hall, which was pre- 

 occupied. The genus is known only 

 from casts. 



nodosus, Hall, 1864, (Echinocystites no- 

 dosus, 20th Rep. N. Y. Mus. Nat, Hist,, 

 p. 360, Niagara Gr. 



MACROSTYLOCRINUS, Hall, 1862, Pal. N. Y., 

 vol. 2, p. 203. [Ety. mokros, long; 

 stylos, an arm ; krinon, lily.] Calyx urn- 

 shaped ; basals 3 ; primary radials 3x 5 ; 

 secondary radiajs 1 or more by 10 ; 

 regular interradials 3 ; azygous inter- 

 radials 4 ; arms 10. Type M. or- 

 natus. 



fasciatus, Hall, 1876, (Cyathocrinus fas- 

 ciatus,) 28th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 130, Niagara Gr. Probably a 

 syn. for M. meeki. 



fusibrachiatus, Ringueberg, 1882, Jour. 

 Gin. Soc. Nat. Hist, vol. 5, p. 119, 

 Niagara Gr. 



meeki, Lyon, 1861, (Actinocrinus meeki,) 

 Proc. Acad. Nat. Sci. Phil., p. 411, 

 Niagara Gr. 

 ornatus, Hall, 1852, Pal. N. Y., vol. 2, p. 



204, Niagara Gr. 

 striatus, Hall, 1868, Trans. 

 Alb. Inst., vol. 4, p. 207, 

 and 20th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 327, 

 Niagara Gr. 



striatus var. granulosus, 

 Hall, 1879, 28th Rep. 

 N. Y. St. Mus. Nat. Hist., 

 p. 129 Niaaara Gr. 

 MALOCYSTITBS, Billings, nus striatus. 

 1858, Can. Org. Rem., 

 Decade 3, p. 66. [Ety. malum, apple ; 

 kustis, bladder.] Body ovate or globu- 

 lar ; plates nonporiferous and in very 

 irregular series ; first series 3 ; second 

 series 10 or 12, and in all the series 40 

 or 50 ; mouth apical : ambulacral ori- 

 fice near the upper part ; arms recum- 

 bent, 8 or more. Type M. murchisoni. 

 barrandi, Billings, 1858, Can. Org. Rem., 

 Decade 3, p. 67, Chazy Gr. 



murchisoni, Billings, 1858, 

 Can. Org. Rem., Dec- 

 ade 3, p. 66, Chazy Gr. 

 MARIACRINUS, Hall, 1859, 

 Pal. N. Y., vol. 3, p. 

 104. [Ety. Maria, proper 

 name ; krinon, lily.] 

 Body obconoidal, in- 

 terradial areas d e - 

 pressed, surface orna- 

 mented ; basals 4 ; 

 primary radials 3x5; 

 secondary radials 3 x 16 ; tertiary radi- 

 als 1 or more by 20 ; interradials 3 to 

 10, the first one supported by the first 

 radials; azygous area large and plates 

 numerous ; vault inflated, plates small ; 

 arms composed of a double series of 

 interlocking plates, and not unfrequently 

 bearing armlets consisting also of a 

 double series of interlocking plates; 

 column round. Type M. nobilissimus. 



FIG. 357. -Malo- 

 cystites murch- 

 isoni. 



