ONONDAGApSALT group. 
347 
713. 24. MURCHISONIA TURRITIFORMIS (n. sp.). 
Pl. LXXXIII. Fig. 6 a, 6. 
Spire elongated, turritiform, composed of numerous flattened volutions; surface unknown j 
columella small. 
This species is readily distinguished by its flattened volutions, which, in the cast, present 
the marks of a carina near or a little below the centre. One specimen preserves five volu¬ 
tions, being imperfect at both extremities : the shell, originally, had probably not less than 
fifteen volutions. 
Fig. 6 a. The cast of two volutions, near the base of the shell. 
Fig. 6 b. A cast of five volutions, imperfect at both extremities. 
Position and locality. In the limestone at Galt, Canada West 
714. 2. SUBULITES YENTRICOSA (n. sp.). 
Pl. LXXXIII. Fig. 7 a, 6. 
Subulate ; volutions about six, somewhat rapidly increasing, the last one ventricose and 
equalling in length all the others; surface unknown. 
The two specimens are both in the condition of casts. In neither of them have I been able 
to see the aperture; but the general form of the shell, the mode of convolution, and the form 
of the last whorl, are so similar to the other species of the genus, that I have thus referred it. 
Fig. 7 a. A small specimen having much of the last volution broken off, but preserving the spire 
complete. 
Fig. 7 b. A large individual with the spire incomplete, but preserving the last volution entire. 
Position and locality. In the limestone at Galt, Canada West. 
715. 5. CYCLONEMA SULCATA. 
Pl. LXXXIV. Fig. la-d. 
Shell ventricose; volutions about four, subangular, rapidly increasing from the apex, last 
one ventricose; surface marked by strong spiral striae, which appear to be arranged in pairs, 
with a deeper groove between each pair; aperture rounded, the columellar side nearly straight; 
umbilicus small. 
The original of this species is given in fig. 1 c; and from the close similarity of the other 
specimens, I have been induced to refer them all to one species. Neither of them are perfect; 
the shell being removed from a great part of the surface, and exfoliated when remaining. The 
umbilicus, which is represented in the woodcut, is seen in a cast, and in the larger specimens it 
[ Paleontology — Yol. ii.] 44 
