122 FLORA OF. LOWER COAL MEASURES OF MISSOURI. 



I very much regret being obliged to separate frora Callipteridmm inem- 

 branaceum one of the originals used by Professor Lesquereux in the descrip- 

 tion of this species. But the careful examination of the specimen (No. 3181 

 of the Lacoe collection), a part of which is given in fig. 4, on pi. xxvii, in 

 the Coal Flora, shows clearly that we have to do with a Pecopteris, while a 

 comparison of its details shows it to be referable to P. clintoni as figured in 

 pi. xlii, fig. 3, of the atlas to the above-named work, although the nervation 

 is rathei' obscure. Similarly, the original of fig. 6 of the same plate agrees 

 well with many specimens labeled P. clintoni by the author of that species, 

 the villosity so prevalent in the latter species being equally well marked in 

 portions of the original in question. The nervation, too, is plainly that 

 of P. clintoni, seemingly, so far as concerns any rachial nerves, in contradic- 

 tion to the published detail. The reference of this specimen to P. clintoni 

 will not seem surprising after a comparison of fig. 6, on pi. xxvii, with fig. 

 4, on pi. xlii, of the Coal Flora, the latter representing one of the types of P. 

 clintoni. Similar examples of villous Pecopteroid forms, of the type of the 

 latter species, found in Nos. 3185 and 3191 labeled C. membranacewn and 

 in the same collection, are also to be placed with P. clintoni Lx. 



The type of the restricted Callipteridium membranaceum is that illus- 

 trated in Lesquereux's fig. 2, a detail of which is shown on our Fig. 4a., 

 PL XX.XV1II. The same characters, including those of the nervation, are 

 seen in No. 3192, referred by that author to this species, except that the 

 nervation is a little more open, being similar in this respect to that seen in 

 Fig. 3, PI. XXXVIII, the enlarged detail of which is shown in Fig. 3a. 



The specimens from Pitcher's coal bank, seen in Figs. 1 and 2, 

 PI. XXXVIII, are doubtfully referable to this species. Their narrow, dis- 

 tant, obtuse pinnules suggest Callipteridium incequale or C. grandini, to both 

 of which our form is related, although the pinnules difi"er from both by the 

 more acute points and the more complete separation at the base. The dis- 

 tant and narrow appearance of the pinnules is due mostly to the reflexion 

 of the margin, which is consequently buried in the rock. 



Localities. — The original types from Henry County, Missouri, without 



.precise locality, Lacoe collection, U. S. Nat. Mus., 3182, 3187; doubtful 



specimens from Pitcher's coal bank, U. S. Nat. Mus., 6591, 5603, 5604, 



5625, 5691, 5807: typical fragments from Deepwater, U. S. Nat. Mus., 5592, 



58101 



