NicKi.Ks AND BAssi.ER.] CATALOGUE OF GENERA AND SPECIES. 235 



Discotrypa elegans (Ulrich) — Contimiod. 



18!)4. Monticulipora clegaus. J. F. Jaiiu's, .lour, ('iiiciiinati Soc;. Nat. TliHt., 

 XVI, p. 180. 

 Cincinnati (Lorraine): Cincinnati, Ohio, and vicinity. 



DITTOPORA Dybow.ski. Genotype: Dittoporaclava?formi.sDybow.ski. 



1S77. Dittopora. Dybownki, Die Clia'tcticU'u (lerOstbaltischen Silnr-forin., p. 84. 



1881. Dittopora. Nicholson, GenuH MonticnUpora, p. 234. 



Obs. Tiiis genus was established for a group of monticuliporoids occurring 

 in the Silurian of Russia. The name has not become current in Ameri- 

 can literature. 



DRYMOTRYPA Ulrich. Genotype: Retepora diffusa Hall. 



18<)0. Dryinotrypa. Ulrich, Gcol". Surv, Illinois, VIII, p. 399. 

 1892. Drymotrypa. Miller, North American Geol. Pal., First Appendix, p. 684. 

 1897. Thamnocella. Simpson, Fourteenth Ann. Rep. State Geologist New York 

 for the year 1894, jx 525. 



Drymotrypa cisseis (Hall). 



1879. Thamniscus ? Cisseis. Hall, Thirty-second Ann. Rep. New York State 



Museum, p. 176 (reprint 1880, p. 38). 

 1883. Thamniscus ? Cisseis. Hall, Rep. State Geologist New York for the year 



1882, pi. xxii, 2:3-;^0. 

 1887. Thamniscus ? Cisseis. Hall and Simpson, Pal. New York, VI, j). 42, pi. 



xxii, 23-30. 

 1890. Drymotrypa cisseis. Ulrich, Geol. Surv. Illinois, VIII, p. 399. 

 1897. Thamnocella Cisseis. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, pi. ix, 9-13. 

 Lower Helderberg: Clarksville, New York. 



Drymotrypa dichotoma (Ulrich). 



1890. Drymotrypa dichotoma. Ulrich, Geol. Surv. Illinois, VIII, p. 399, pi. 

 hii, 6. 

 Trenton: Montreal, Canada. 



Drymotrypa diffusa (Hall). 



1852. Retepora diffusa. Hall, Pal. New York, II, p. 160, pi. xl C, la-f. 

 1890. Drj'motrypa diffusa. Ulrich, Geol. Surv. Illinois, VIII, pi. liii, 7-7h. 

 Niagara: Lockport, New York. 



Drymotrypa niagarensis (Hall). 



1876. Thamniscus ? Niagarensis. Hall, Twenty-eighth Ann. Rep. New York 

 State Mus. (documentary edition), pi. xi, 22-25; ibid., (Museum edi- 

 tion, 1879), p. 126, pi. xi, 22-25. 



1882. Thamniscus niagarensis. Hall, Eleventh Ann. Rep. Indiana Geol. Nat. 



Hist., p. 254, pi. X, 22-25. 

 1890. Drymotrypa niagarensis. Ulrich, Geol. Surv. Illinois, VIII, p. 399. 

 1897. Thamniscus Niagarensis. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, pi. ix, 15-17. 

 Niagara: Waldron, Indiana. 



Dybowskia Waagen and Pichl. See Fistiilipora McCoy. 



Dybow.skiella Waagen and Wentzel. See Fistulipora McCoy. 



Enallopora D'Orbig'ny. Genotj'pe: Gorgonia perantiqiia Hall. 

 1850. Enallopora. D'Orbigny, Prod, de Pal., I, p. 22. 

 1889. Enallopora. Miller, North American Geol. Pal., p. 300. 



Obs. For objections to the use nf this name, see Geol. Surv. Illinois, VIII, 

 p. 683. 



