SUB- GENUS MONOTRYPA. 177 



which I have here brought forward entitle me to claim that it 

 is not in the meanwhile proved that my M. Winteri is identi- 

 cal with Favosites jibroglobosus, Ouenstedt. Not being myself 

 in the position to examine microscopic sections of the latter 

 form, I do not feel able to deny that the two may prove to 

 be really the same ; but I do not think the evidence would at 

 present be sufficient to demonstrate this. In any case, I may 

 point out that the validity of the section Monotrypa will not 

 be affected by the ultimate fate of M. Winteri, since the type of 

 this section is the M. nndtilata of the Trenton Limestone. 



From AI. ^tnd^Uata the present species is distinguished by 

 its concavo-convex or regularly hemispherical form, by the 

 more rapid intercalation of the new tubes, and by the greater 

 abundance of the tabulae, while it never attains the dimensions, 

 or assumes the lobate habit, of the former. 



I have named the species in honour of Herr Winter of Ger- 

 olstein, from whom I received much friendly assistance while 

 collectinof in the Eifel. 



Formation and Locality. — Not uncommon in the Devonian 

 of Gees, near Gerolstein, Eifel. Also not uncommon in the 

 Inferior Devonian deposits of La Baconniere, Laval. (Coll. 

 Dr Daniel CEhlert.) 



Monticulipora (Monotrypa) irregularis, Ulrirli. 



(Fig. 35-) 



CJicctetes irregularis, Ulrich, Journ. Cincinnati, Soc. Nat. Hist., 1879, ?'■ 

 XII. figs. 10-10/'. 



Spec. Char. — Corallum of small size (generally about three- 

 quarters of an inch in diameter), apparently free, and approxi- 

 mately spheroidal in shape, the surface being usually covered 

 with irregular and well-marked nodulatlons. No monticules 



pores, especially where (from their soft and friable nature) they have been worn 

 away in the process of preparing thin sections. Their true nature is, however, at 

 once recognised when it is seen that they are just as conspicuous in tangential as 

 in longitudinal sections. 



