OX FOSSIL POLYZOA. 141 



37. Idmonea lineata, Hag., H. Tab. II. fig. 13 ; Goldf., ' Pet.' Tab. 



IX. figs. 15 c,/. = Retepora disticlia, G., in part. 



38. Idmoxea gibbosa, Hag., H. Tab. II. fig. 14. 



39. Idmoxea genicclata, Hag., H. Tab. III. fig. 5; Goldf., ' Pet.' Tab. 



IX. fig. 12 e, f = Retepora clatlirata, G., in part. 



40. Idmoxea tetkasticha, Hag., H. Tab. IV. fig. 3. 



Some of these Hagenow describes as found in the Maestrioht and 

 Falkenberg beds. I cannot give the range of the species other than that 

 given by the author. In my Faxoe material I have several Idmonece, and 

 it would be quite possible out of the varied forms to construct a number 

 of species, but I should be inclined to place the majouty in three species 

 only of those described above — I. dorsata, I. lineata, or I. pseudo-disticha. 



Sub-genus Tecxcatcla, Hagenow. 



Out of the Retepora trwncaia, Goldfuss — with other species as allies — 

 Hagenow constructs the sub-genus Truncatuia. Although the facial 

 character at first sight appears to be like Idmonea, a closer study of the 

 form shows certain features altogether different. The more prominent 

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

 clustered together and not separate. This appears to be a normal 

 feature. (2) The reverse of one species at least — R. truncata — is very 

 peculiarly striated, or, speaking with more exactness, the lines of striae 

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

 very delicate membrane which covers the reverse. It this be a correct 

 description, founded upon observation of a limited number of specimens 

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

 retaining the sub-generic term. 



41. Trttncatula filix, Hagenow, tab. iii. fig. 4. 



42. Telxoatula trlxcata, Goldf., Hag. tab. iii. fig. 2. Goldf., ' Pet,' 



tab. ix. fig. 14:. = Retepora ibid., Goldf.; Lamk. ; Milnc-Ed. 

 = Idmonea ibid , Blainv. 



43. Tbuncatula repexs, Hag., tab. iii. fig 1. 

 Range. — Hagenow cites Maestricht and Falkenberg. 



I have several lists of fossils from the Cretaceous beds of America, and 

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

 Taking the order of the strata as given by Lyell, Emmons, and others, as 

 L pper Cretaceous, the following species of Idinonece correspond to some 

 extent with the Idmonece already given from Hagenow and Goldfuss. 



Idmoxea coxtortilis, Lonsdale, 'Quart. Jour. Geol. Soc.' vol. i. p. G8= 

 Grisisina and Idmonea ibid., D'Orb., ' Pal. Fr.' vol. ii. and vol. v. 

 Locality. — Timber Creek, New Jersey. 



The Tertiary Idmonece, both of Europe and America, are of a very 

 special character, and the facies of the several species would afford 

 valuable details for the study of the Palaeontology of the group. There is a 

 slight difference between some of the American and European forms ; 

 but there is a wide diffei'ence in the facies of others. I know of no 

 American Tertiary Idmonece similar in character to those described by 

 Reuss from the North Italian deposits. The localities are those given by 

 the several authors. 



44. Idmoxea maxillaris, Lonsdale, ' Quart. Jour. Geol. Soc' vol i. 



p. 523 = Crisisina ibid., D'Orb, Prod. 2, p. o97=Idmonea ibid. 



