100 F. Springer—Burlington Limestone in New Mexico. 
and ae oscar the results of'a detailed study of the collec- 
tions from this and other Lower Carboniferous localities in 
the Rocky Againarie which I am convinced will yield very 
important data bearing upon the relations between the ‘great 
. Mississippi Carboniferous basin and its western equivalent. 
BraAcHIOPODA. 
Productus semireticulatus, var. closely allied to the variety of 
this species gine baie in the Kinderhook, and to the form de- 
scribed as P. setigerus, var. Keokuk, and its equivalent form in 
the Upper Burlington. 
, closely allied to P. ean of the Keokuk, and a repre- 
‘sentative form in the Bur on. 
, of the type of P. eaibeiauiile of the Keokuk. 
* of the type of P. areuatus of the Kinderhook. * 
, of the type P. Shumardianus of the Kinderhook. 
It is possible that the last two forms may be the young of 
the P. semireticulatus. 
Chonetes 
(not Ha 
Strophomena rhomboidalis, of the form found in the Kinder aa 
at Burlington, and also in the Waverly group in Uta 
P. 
oP. 
, closely allied to C. Logani Koren & Pratten 
at Mountain Spring, Nevada, described by Dr.. White in the 
Report of the ee Expedi ition. 
Hemipronites erent 
str 
Orthis res we inata, ver much like the O, Swallovi of the vie 
Burlin 
Orthis ‘Miehelina, strikingly near to the Belgian form of the. re 
specie 
Rhynchonella aoe iagatadliiony small. form of the species de- 
seribed by Shum 
Camarophoria are EEE Miller—closely allied to R. Cooper — 
ensis of the Choteau, and still more to an ip vations form 
_ occurring in the Upper Burlington at Augusta, Iow 
Spirifer extenuatus Hall, of the Kinderhook of Fea apparent 
identical with the form described under this name by Dr. White _ 
sod g™ Mountain Spring, Nevada. Also very similar to S. Car- 
tert Hall (see Meek in Pal. Ohio, vol. i, p. 386), a ay Wa 
verly. Probably only a variety of the Eu uropean 
S. striatiformis Meek, a well marked form closely ‘allied to & i 
striatus of Europe 
S. centronatus Win che lL. 
S. B pater sede (?) Shumard, apparently aaa with the form | 
m Mountain Spring, Nevada, referred by Dr. White to this — 
ines ies. It is well bees a shows hi Ai hana and e 
is probably a new s 
S. Nova Mexicana Miller. 
Spiriferina , Similar to S. spinosa of the Chester. 
