) 
: 
126 TRANSACTIONS OF THE [MAR. 17, 
Trans. Roy. Soc. Can., vol. iii., sec. iv., p. 35., pl. v., fig. Lla 
to é. 
This species is not uncommon in the upper part of Band 6. 
especially in Assise 5, whence it ranges upward through the 
Paradoxides beds. 
ACROTRETA, Kutorga. 
ACROTRETA GEMMA, Bill. ? 
Paleozoic Fossils, vol. i., pr. 216., fig. 201 a to f. 
U.S. Geol. Surv. Bull. 30, p. 98, pl. viii, figs. 1, la and 10. 
A small brachiopod of the size of this species is found 
sparingly in the lower part of Band. b., but owing to the coarse- 
ness of the matrix and the delicacy of the shell, the latter is 
greatly distorted and cannot be positively identified with this 
species. 
Horizon and locality. Dark sandstones of Assise 1, at Han- 
ford Brook. 
The conical ventral valve and high deltidial area shows that 
this shell is an Acrotreta. 
ACROTRETA GEMMULA. PI. v., figs. 5 a to d. 
Trans. Roy. Soc. Can., vol. xi., sec. iv., p. 87, pl. xvi., figs. 2a 
to d. 
This pretty little shell, the smallest of its kind, originally de- 
scribed from the sandstones of Assise 3, has been found in As- 
sise 2, thus extending the range downward. It has the pecu- 
liarity of a foramen opening behind the apex. 
LINGULELLA (?) Cc&LATA, Hall. 
Orbicula celata Hall, Pal. N. Y., vol. i., p. 290, pl. Ixxix., fig. 
9a to c. 
Lingulella celata Walcott, U. S. Geol. Sury. Bull. 30, p. 95, 
pl. vil., figs la to d. 
Two examples of the ventral valve of this little shell have 
been found in the sandstones of Assise 1. They show the low 
radiating ribs and the peculiar cancellated surface of this spe- 
cies. One, also, has an apical depression, or minute pit in the 
position where the foraminal opening would be in an Acrotreta 
or Linnarssonia. 
This species differs from LZ. (?) inflata, with which it occurs, 
in having the beak elevated, so that when seen from the side 
the valve is straight along the median line; whereas in Z. (2) in- 
Jlata it is strongly arched. 
