ON FOSSIL rOI.Y/OA. 



141 



Ok' 



tig. o; 



tig. 0; 



ig. / = 



Lamx., 



37. IDMONKA UNKATA, Hilg., H. Till). II. fig. 13 ; Cioldf., 'Pet.' T:lb. 



IX. lig.s. loc, /. =^ lich'purit dt'fficJi(i, (t., in jwrt. 

 3!-!. Tdmon'ka fiinnosA, Hag., H. Tah. II. fig. 14. 

 :5it. Ii)MO\i:a c.KNicui.AiA, Hag., H. Tub. IH. fig. '> ■ Goldf., ' Pet.' Tab. 



IX. fig. 12 <', f = licli'piint rliUJinttd, G., in part. 



40. lUMONKA TETKASTICUA, Hag., H. Tab. IV. fig. 3. 



Some of tlio.se Ilagenow de.scribes as ibund in tlio !^^acstl•i(•llt. and 

 Falkcnberg beds. 1 cannot give tbo range of the specie.s other than tliat 

 givon by the autlior. In my Faxoc material I have several IJmnnpjv., and 

 it wonld bo quite po-ssiblo out of the varied form.s to construct a number 

 of species, but I should bo inclined to place the majoiifcy in three species 

 only oftho.se described above— J. Jurgnht, T. I'nieata, or I. liticndu-distichd. 



Sub-{jcnus Tui'N'CATit.A, llajjenow. 



Out of the Jietrporn. trnvcufii, Goldfnss — with other species as allies — 

 Hagenow constructs the sub-genus Tnnicatuln. Although the facial 

 cliaracter at first sight appears to be like Idmoncn, a closer studj' of tlu* 

 iurm shows certain features altogether different. The more prominent 

 are these : — (1) On the different sides of the mesial line the cells ;ire 

 clustered together and nob separate. This appears to bo a ni.i nial 

 fer.ture. (2) The reverse of one species at least — U. trnnrdta is very 

 peculiarly striated, or, speaking -with more exactness, the lines of stria* 

 seems to bo the line markings of the individual cells seen through a 

 very delicate membrane which covers the reverse. It this be a cori'ecl 

 description, ibunded upon observation of a limited number of si)cciniens 

 from the Faxoe Limestone material, then 1 cannot see the necessity for 

 retaining the sub-generic term. 



41. Ti;cNCATi:i,A mi,ix, Hagonow, tab. iii. fig. 4. 



42. TiaxcATur.A TUiiNCATA, Goldf., Hag. tab. iii. fig. 2. Goldf., 'Pet.' 



tab. ix. fig. \\.= Rflt'pora ibid., Goldf.; Lamk. ; Afilnc-lul. 

 = Lh)iiiiif:a ibid , Blainv. 



43. TitiMiATur.A 1{i:pi;\s, Hag., tab. iii. fig 1. 

 R(ini/c. — Hagenow cites Maestricht and Falkcnberg. 



I have several lists ct' fossils from the C'retaceous beds of America, and 

 a fine suite of fossils as -well, many of which are undescribed as yd. 

 Taking the order of the strata as given by Lyell, Mmraons, and othei's, ;is 

 Upper Cretaceous, the following species of fJniniieic correspond to some; 

 extent with tho Llindintc already given from Hagenow and Goldfnss. 



Tdmonka coNTORTii.is, Lonsdale, 'Qnai't. Jour. (icol. Soe.' vol. i. p. {\>< = 

 Crisisi)Hi and Idiiinnea ibid., D'Orb., ' Pal. Fr.' vol. ii. and vol. v. 

 Lnrah'fi/. — Timber Creek, New Jersey. 



The Tertiary Idmoiun', both of Furope and America, are of a very 

 special character, and the I'acies of the several species wonld all'ord 

 valuable details for the study of the PaUeontology of the grouj). '^riiero is a 

 sliglif diflerenee between some of the American and European forms; 

 hut there is a wide difference in the faeies of others. I know of no 

 American Tertiary ihuovciv similar in (!haracter to those described by 

 Ueu.ss from the Xoi'th Italian de])osits. The localities are those given by 

 the several authors. 



41. Id.mon'ka MAXir.r.AUis, Lonsdale, 'Quart. Jour. Geol. Soc' vol i. 

 p. 523 = C//s('»(';ei ibid., D'Orb, Prod, 2, p. o\^~=Td)nuu(:a ibitl. 



