486 THE JOURNAL OF GEOLOGY. 



thus far proved to be rare and unsatisfactory. So far as their 

 characters have been made out they agree with the prevailing 

 vegetable and reptilian types in presenting a decided Permian, or 

 perhaps early Secondary, facies. Both in its physical and palaeon- 

 tological characteristics this formation of southern Brazil offers 

 considerable analogies with those of South Africa, India, and 

 Australia, containing the Glossopteris flora (see Waagen, Neues 

 Jahrbuch, 1888, II., pp. 172-177). If on further study this 

 analogy is found to hold good, we shall have at, or near, the 

 close of the Palseozoic two strongly contrasted chains of similar 

 formations extending from east to west across the whole present 

 land area of the globe. The one with an abundant and character- 

 istic marine fauna reaches from China to Bolivia with the Salt 

 Range and the Lower Amazonas (also the Pichis river locality in 

 Peru) as intermediate links ; the other, with predominant fresh- 

 water and terrestrial conditions, reaches from Australia through 

 India and Africa to southern central South America. 



Terebratula itaitubeuse. — Dr. Waagen who distinguishes the 

 group of Terebratulas, to which this species belongs by King's 

 name Dielasma identifies this species on the limit between the 

 middle and lower division of the Productus limestone in the Salt 

 Range, India. 



Terebratula sp. — The forms represented by fig. 24, pi. III. of 

 my paper and referred with doubt to the young of the preceding 

 species, prove to belong to a distinct type of short louped Tere- 

 bratuloids without or with only rudimentary septal plates in the 

 dorsal valve. This character, combined with dental plates in the 

 ventral valve, would perhaps place it in Waagen's genus Zug- 

 meyeria, which thus far is only known in the Rhaetic. 



Atliyris subtilita. — Dr. Waagen, who makes a new genus Spirig- 

 erella, for types similar to this, considers the Indian and Brazilian 

 forms as identical and distinct from the North American A. sub- 

 tilita, proposing to distinguish them by the name 5. dcrbyi. His 

 doubt as to whether I may not in my description have somewhat 

 exaggerated the importance of the foramen may be well founded, 



