MEL.] 



ECHINODERMA TA 



261 



Fig. 361.— Melocrinus bain- 

 bridgensis. 



Melocrinus, Goldfuss, 1826, Petref. Germ., 



p. 197. [Ety. 

 melo, melon ; 

 krinon, lily.] 

 Body obcon- 

 oidal; surface 

 ornamented ; 

 interradia 1 

 areas de- 

 pressed ; ba- 

 sals4; radials 

 3x5; second- 

 ary radials 2 

 or 3x10; ter- 

 tiary radials 

 2 or 3x20; 

 interradials 8 

 to 12; azygous plates more numerous; 

 vault convex, with orifice excentric. 

 Type M. hieroglyphicus. 

 bainbridgensifl, 

 Hall & Whit- 

 field, 1875, 

 (Ctenocrinus 

 bainbridgen- 

 sis,)01iioPal., 

 vol. 2, p. 158, 

 Portage Gr. 

 breviradia t u s , 

 Hall & Whit- 

 field, 1875, 

 ( Ctenocrinus 

 brevir ad i a- 

 tus,Ohio Pal., FlG 362.— Melocrinus bain- 

 vol. 2, p. 160, bridgensis. Basal view. 

 Ham. Gr. 

 clarkii, Williams, 1882, Proc. Acad. Nat. 

 . Sci., p. 31, Chemung Gr. 

 laevis Roemer, 1860, (Cytocrinus lsevis,) 

 Sil. Fauna W. Tenn., p. 56, Niag- 

 ara Gr. 

 nodosus Hall, 1861, Geo. Rep. Wis., p. 

 19, Devonian. 



Fig. 363.— Melocrinus obconicus. » 



obconicus, Hall, 1863, Trans. Alb. Inst., 

 vol. 4, p. 206, Niagara Gr. 



obpyramidalis, Winchell & Marcy, 1865, 

 ( A.ciinocrinus oboyramidalis,) Mem. 

 Bost. Soc. Nat. Hist., vol. 1, p. 87, Ni- 

 agara Gr. 



pratteni, McChesney, 1860, (Forbesocrinus 

 pratteni,) New Pal. Foss., p. 29, and 

 Trans. Chi. Acad. Sci., p. 22, War- 

 saw Gr. 



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

 228, Niagara Gr. 



verneuili, Troost, 1850, (Actinocrinus 

 verneuili,) and Hall, 20th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 327, Niagara Gr. 

 Melonites, Owen & Norwood, 1846, Am. 

 Jour. Sci., 2d series, vol. 2, p. 225. 

 [Ety. melon, melon ; lithos, stone.] Test 

 spheroidal, divided into five convex 

 ambulacra! and five convex interarabu- 

 lacral areas, resembling in form a 

 melon, with ten ribs or convex eleva- 

 tions and as many sharply defined de- 

 pressions ; plates of toe interambu- 

 lacral areas large, thick, hexagonal, not 

 overlapping, arranged in series, 8 or 10 

 of which cover the wider part, but not 

 more than two reach the apical disk ; 

 ambulacral areas covered with about 8 

 or 10 rows of plates, each plate having 

 two pores, so arranged that the pores 

 of the central two ranges are at the 

 ends most distant from the median 

 line ; ocular plates, without pores, and 



Fig. 364.— Melonites multiporus. Apical disk, 

 genital and ocular pores. 



much smaller than the genital, which 



have ^numerous pores that differ, in 



number, in the same species ; jaws very 



strong. Type M. multiporus. 

 crassus, Ham- 

 bach, 1884, 



Trans. St. 



Louis Acad. 



Sci., vol. 4, '"~*>. 



p. 548. St. - 



Louis Gr. 

 danse, see Olig- 



oporusdanae. 

 irregularis, 



Hambach, 



1884, Trans. 



St. Louis 



Acad. Sci., 



vol 4, p. 548, 



St. Louis Gr. F«»- 365. -Melonites inulti- 



, , . porus. Oral opening and 



multiporus, jaws, displaced at x so as to 



Owen&Nor- leave an opening. 



wood, 1846, 



Am. Jour. Sci., 2d ser., vol. 2, p. 225, 



St. Louis Gr. 



18 



