GOM. — GON.] 



ECHINODERMA TA. 



249 



and grooves beset with small plates ; 10 

 to 13 pectinated rhombs ; column short, 

 tapering to a point. Type G. multiporus. 

 anatiformis, Hall, 1847, (Echinoencrinites 

 anatiformis,) Pal. N. Y., vol. 1, p. 89, 

 Trenton Gr. 

 forbesi, Billings, 1857, Rep. of Progr. Geo. 

 Sur. Can., p. 283, and Can. Org. Rem., 

 Decade 3, p. 59, Ohazy Gr. 

 logani, Billings, 1857, Rep. of Progress, 

 Geo. Sur. Can., p. 282, and Can. Org. 

 Rem., Decade 3, p. 57, Trenton Gr. 



logani var. gra- 

 cilis, Billings, 

 1858, Can. Org. 

 Rem., Decade 3, 

 p. 59. Trenton Gr. 

 multiporus, Bill- 

 ings, 1854, Can. 

 Jour., vol. 2, p. 

 215, and Can. Org. 

 Rem., Decade 3, 

 p. 54, Trenton Gr. 



GOMPHOCYSTITES, 



Hall, 1869, 20th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 351, 

 [Ety. gomphos, nail or rudder; kustis, 

 bladder.] Elongate pyriform, narrow 

 r 



-.o" 



Fig. 317— Glyptocys 

 tites multiporus. 



rrmn 



: : v /" a •! ' l J 



: i Yf, .•' v-^v'-- ■■' ' 



'. . ;«iH. r r ■>-- .^ — - — . , 



V- 1 .,- 



indianensis n. sp., Niagara Gr. Upper 

 part elliptical in outline and regularly 

 convex ; five ambulacral grooves curve 

 spirally outward from an ambulacral 

 orifice within the 

 groove near the 

 mouth, and extend 

 below the summit ; 

 mouth round, sit- 

 uate between two 

 of the ambulacral 

 grooves ; each arn- 

 bulacral groove 

 has a suture in the 

 bottom of it, but 

 there is no other 

 evidence of the 



subdivision of the *Su82; | -^ on,pll i " 

 , • , , , cystites indianensis. 



top into plates; Summit view, 

 even the mouth 



appears as a hole through a solid test; 

 whole surface tuberculated, and each 

 tubercle pierced with a pair of pores. 

 Collected by J. F. Hammell in Jeffer- 

 son County, Indiana, 

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

 Mus. Nat. Hist., p. 352, Niagara Gr. 

 Goniastekoidocrinus, Lyon & Casseday, 

 1859, Am. Jour, Sci., vol. 28, 

 2d series, p. 233. [Ety. like 

 the recent genus Goniasler; 

 krvnon, lily.] Body short, cyl- 

 indrical, or subglobose ; baeals 

 5 ; subradials 5, often protuber- 

 ant ; primary radials 3x5; 

 secondary radials 2 to 4 x 10 ; 

 \ \ arms numerous, delicate, pend- 



Q$m?// 



Fig. 318.— Goniasteroldocrinus flscellus. Diagram 2 diam. 



Fig. 320. — Dia- 

 grammatic view 

 of Gilbertsocri- 

 nus bursa to 

 show it is dis- 

 tinct from Goni- 

 asteroidocrinus. 



below, inflated above ; plates spirally ar- 

 ranged ; ambulacral orifice central on the 

 upper surface ; mouth excentric ; arms 

 sessile, and curving from the ambulac- 

 ral orifice outward to or below the point 

 of greatest diameter. Type G. glans. 



clavus, Hall, 1864, 20th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 353, Niagara Gr. 



glans, Hall, 1864, 20th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 352, Niagara Gr. 



ent, supporting pinnules ; interradials 

 10 to 18 in each area ; vault depressed and 

 extending in five or six pseudo-brachial 

 appendages star-like, which bifurcate, 

 then spread, curve, and terminate each 

 in a point ; these brachial appendages 

 separate the interradial areas from the 

 dome ; excurrent orifice sublateral, not 

 protruding. Type S. tuberosus. There 

 are some who use Ollacrinus as the 



