with descriptions of new Fossils. 221 
gently convex, sloping very gradually from thoracic margin to border; 
segments four or five, wide, flattened convex, the anterior one more ele- 
vated than the others, posterior ones nearly obsolete. 
_ An excellent figure of the head of this species is given by Dr, Roemer 
In his “ Kreidebildungen von Texas,” (Taf. xi, fig. 2, a), but the! author 
has proposed no name for the species. Fig. 2 c-d of same plate belongs 
to the head of an Arionellus, which has been erroneously referred to the 
pygidium of this species, 
ceurs in crystalline gray limestone, of the age of the Potsdam sand- 
stone, at the head of Clear creek, Burnet county, associated with Arionel- 
Us Leranus. 
Named in honor of Prof, Ferd. Raemer.—Texas State Collection. 
BRACHIOPODA. 
Discina microscopica (n. sp.). 
Shell very minute, conico-subquadrate, much elevated, nearly as high 
as long ; vertex, nearly: or quite marginal, and marked with a small ats 
_ 4rea triangular, flattened, extending from apex to posterior margin. Sur- 
face marked with extremely fine, concentric lines of growth. — 
This is an extremely minute species, the largest specimen being searcely 
more than +8, of an inch in Jength. 
A few examples of this species were found in the Potsdam sandstone, 
hear the sources of Morgan's ereek, Burnet county. It is associated with 
Arionellus Texanus and Orthis Coloradoensisx—Texas State Collection. 
Camerella (sp. ?). 
There are several specimens of a small brachiopod in the Texas State 
Collection, from the Potsdam sandstone of Morgan’s creek, Burnet 7 
which appear to belong to the genus Camarella recently created by Mr. 
E, Billings. Unfortunately, however, they consist merely of detached 
and imperfect valves, too much weathered for satisfactory determination 
and description. 
GASTEROPODA. 
Capulus (sp.?). : 
: j i dorsum 
A small, smooth species of Capulus with flattened sides, convex 
and narrow curved spits occurs with the preceding at Morgan's te 
Burnet county, but the characters are not sufficiently distinct to warran 
Us in giving ‘a description of it. 
St. Louis, June 12, 1861. 
