492 THE JOURNAL OF GEOLOGY. 



ion that the North American and Brazilian form is distinct from 

 the European >S\ lineatus, Martin. 



Rhynchonella pipira. — The distinct truncation of the beak of 

 this species would appear to place it in Waagen's genus Terebrat- 

 idoidea. The internal characters are unknown. 



Ca7naraphoria sp. — A small smooth species of this genus is 

 quite abundant in white decomposed chert from Lake Arapicu, Rio 

 Trombetas, and rare in the Itaituba limestone, being at both places 

 too imperfect for determination. 



Orthis morganiana. — Specimens from New Mexico referred 

 with doubt to 0. resupinoides, Cox, by Dr. White, are possibly 

 identical, in which case that name will take precedence. They 

 are smaller and casts do not show the prominent dental lamellae 

 and septum of the Brazilian form, but the material is too poor for 

 a satisfactory comparison. Specimens from Old Baldy near Vir- 

 ginia City, Montana, in the National Museum at Washington, 

 labeled 0. resupinata, Martin, by Mr. Meek, are almost certainly 

 identical. Dr. Waagen describes a closely allied form from the 

 Salt Range under the name of 0. derbyi. 



Streptorhynchus. — According to Dr. Waagen's arrangement, 

 based on well defined internal characters of this perplexing group, 

 vS. correianns takes the name of derbya, S. liallianus remains with 

 that of Streptorhynchus, while 5. tapajotensis becomes orthothetes. 

 The specimens from the shale of Pacoval, Rio Curua, referred to 

 S. {derbya) correianns, are more depressed and less irregular than 

 those from Itaituba, but for the most part attain as large a size 

 and present the strong ventral septum of that species, though 

 possibly some of the smaller specimens not showing internal 

 characters may belong to Orthothetes. 



Chonetes glabra. — Some of the specimens from Pacoval, Rio 

 Curua, referred here are larger than those from Itaituba and have 

 the mesial sinus very indistinct, or lacking, thus approaching the 

 characters of C. amazo?rica, which possibly may prove to be iden- 

 tical. 



Prodiictns scmiretiadatus. — Specimens from Lake Titicaca that 



