196 



CCELENTERA TA. 



[mic- mon. 



Michelinia, DeKoninck, 1842, Descrides 

 Anim. Foss. Belg., p. 29. [Ety. proper 

 name.] Corallum composite, forming 

 hemispherical, depressed, or pyriform 

 masses of prismatic or subcylindri- 

 cal corallites; mural pores; tabula? ; tubes 

 having striae or ridges; epitheca con- 

 centrically wrinkled, with root-like pro- 

 longations. Type M. favosa. 



Fig. LBS.- 



Miclicliiiia 

 i-ui^fiieae. 



Fig. 191.— MegaJograptui welehL l'mml, show- 

 cells unci spinous processes. 



convexa, D'Orbigny, 1850, Prodr. de Pale- 

 ont.,t. 1, p. 107, Onondaga and ('ornif- 

 erous Grs. 



dividua, Hall, 1876, Dlost 

 Dev. Foss., pi. I s . Ham. 

 Gr. 

 eugenea', White, lss4, l.Ith, 

 Rep, Geo. Ind., p. 119, 

 Coal Meas. 

 expansa, White, 1880, 12th 

 Rep. U. S. Geo. Bar. 

 Terr., p. 158, Waverly (Jr. 

 favoaitoiaea, Billings, 1858, 

 Rep. of Progr. Can. Geo. 

 Bar., p. 175, l'p. Held. 

 Gr. 



insignis, Rominger, 1876, Foss. Corals, 

 1». 75, Up. Held, and 

 Ham. Gr. 

 intermittens, Billings, 1859, 

 Can. Nat. and Geo. Sur., 

 vol. 4, p. 113, Cornifer- 

 ous Gr. 

 lenticularis, Hall, 1874,26th 

 Rep. N. Y. St. Mus. Nat. 

 Hist., p. 113, Low. Held. 

 Gr. 

 placenta, White, 1880, 12th 

 Rep. U. S. Geo. Sur. Terr., 

 p. 157, Waverly Gr. 

 stvlopora, Eaton, 1832, eugenere. An- 

 '(Astrea stylopora,) Geo. J™ •*■£?& 

 Text book, p. 40, and larger eoral- 

 Illust. Dev. Foss., pi. 18, Htes. 

 Ham. Gr. 

 trochiscus, Rominger, 1876, Pal. Foss., p. 

 76,syn. for Pleurodictyum americanum. 

 Microcyclus, Meek & Worthen, 1868, Geo. 

 Sur. 111., vol. 3, p. 420. [Ety. mikros, 

 small; kuklos, circle.] Corallum free or 

 with a minute central point of attach- 

 ment, discoidal; no columella; calice 

 shallow, with a single fossula; septa 

 short, radiating regularly, or those 

 nearest the fossette converging a little 



Ki<; II 

 Micnell n ia 



toward its sides; epitheca well de- 

 veloped. Type M. discus, 

 discus, Meek a Worthen, 

 1868, Geo. Sur. 111., vol. 

 3, p. 4l'0, Ham. Gr. 



Millepora repens, see Alveo- 

 li tes repens. 



Monograpti IS, K in m o n s , 

 18 5 6, (Monograpsns, ) 

 Am. Geo., p. 106. [Ety. ' " ; •'■"■ ; Mtoro- 



i "t CVellls discus. 



uwnos, one; grapho, I y 

 write.] Serrations confined to one edge 

 of the stipe; axis none. Type M. ele- 

 gans. 

 convolutus var. coppingeri. Etheridge, 

 1878, Qoar. .lour. Geo. Soc, vol. .">i, p. 

 ">77, Silurian, 

 elegans, Emmons, 1856, Am. Geo., p. 106, 



Up. Taconic. 

 rectus, Emmons, 1856, Am. Geo., p. 107, 

 Up. Taconii . 

 HoMOTSTFA, Nicholson, 1879, Pal. Tab. Cor- 

 als, p. 320. [Ety. monos, one; impa, 

 hole.] Corallites of two kinds; the 

 larger aggregated into clusters (monti- 

 cules ; thf smaller occupying the space 

 between the monticules; both larger 

 and smaller thin-walled, polygonal tab- 

 ulae remote. Type M. undulata. This 

 was proposed as a subgenus for Monti- 

 culipora; upon microscopial examina- 

 tion and upon such a state of facts, 1 

 prefer, at present, to leave the species 

 under the genus Monticuliporm. 

 (?)spinulosa, Hall, 1887, Pal. N. Y., vol. 1, 

 p. (i7. Low. Held. Gr. 

 Monotrypella, Ulrich, 1882, Jour. Cin.Soc. 

 Nat. Hist., vol. 5, p. 168. [Ety. mono- 

 Irypn ; and illtu, diminutive.] Ramose, 

 smooth or tuberculated, cells of one 

 kind only; walls thin, in the axial re- 

 gion, and" thicker toward the periphery ; 

 diaphragms straight; no spiniform 

 tubuli. Type M. tequalis. 

 abrupta, Hail, 1*7!), (Chetetes abrupt us, i 

 32d Rep. V Y. St. Mus. Nat. Hist., p. 

 L48, Low. Held. Gr. 

 sequalis, Ulrich, 1882, Jour. Cin. Soc. Nat. 



Hist, vol. 5. i-. 247, Hud. Riv. Or. 

 arbuscula, Hall, 1887, Pal. N. Y., v. ,1.6, p. 



12, Low. Held. Qr. 

 briureiis, Nicholson, 1875, (Chetetes bri- 



areus,)Ohio 



Pal., vol. 2, 



p. 202,Utica 



Slate. 



c o n s i m i 1 i s, 



Hall, 1876, 



(Chetetes 



consimilis, ) 



28th Ren. 



N. Y. St. 



Mus. Nat. 



Hist., p. 110, 



Niagara Gr. 



densa, Hall, 



1874, (Trem- 



atopora densa,) 26th Rep. N. Y. St. 



Mus. Nat. Hist., p. 105, Low. Held. Gr. 



MR. 



Fig. 195.— Monotrypelln qttad- 

 rata, nalural size and mag- 

 nified. 



