84 



nearly so, two or three lines in diameter. Surface unknown. The follow- 

 ing are the dimensions of specimens : 



1. 42 lines in length ; taj^ers from 22 Unes to 18 ; 13 septa. 



2. — 5 inches in length ; tapers from 24 to 16 lines ; 18 septa. 



3. — 8|- inches in length ; tapers from 30 to 16 lines; 25 septa. At the 

 larger end there are 11 septa in 4 inches ; at the smaller extremity 7 in 

 2 inches. 



4, — Septate portion 8 inches in length ; tapers from 30 to 18 lines ; 20 

 septa. The septa become deeply concave on approaching the chamber of 

 habitation about two inches of which remain. 



Grimsby ; Niagara formation. J. Pettit. 



O. Pylades, n. sp. — Two or three feet in length ; largest specimen 

 seen three inches in diameter near the aperture ; tapering about 1| lines 

 to the inch ; section circular ; septa about five in two inches ; siphuncle 

 small and about half way between the centre and the margin ; chamber 

 of habitation large. Surface unknown. The following are the dimensions 

 of the two specimens examined : 



1. Length 12 inches, including chamber of habitation 6^ inches ; sep- 

 tate portion 5^ inches in length, with 14 septa ; tapers from oj to 2 

 inches. 



2. 4 inches in length ; 10 septa. The specimen is somewhat distorted, 



and the rate of tapering cannot be well determined. 



This species occurs in Grimsby ; Niagara formation. J. Pettit. 



0. Varro, n. sp. — This appears to be a small, slender, closely annu- 

 lated and very gradually tapering species. The septa cannot be very 

 clearly distinguished, but in two of the specimens there appear to be about 

 twelve to the inch. The siphuncle is small and central, or nearly so. The 

 annulations are well defined, uniformly concave in the bottom, and sepa- 

 rated by somewhat acutely rounded ridges. Section circular. 



A specimen 43 lines in length, tapers from 3| to IJ lines, and is orna- 

 mented with about 75 annulations. Most of these pass directly round at 

 ' right angles, but others are oblique, and a few divide into two branches, 

 and then unite again. There are eighteen in the first inch at the larger 

 extremity, but towards the apex they become more numerous. 



Another specimen 18 lines in length, tapers from 4 to 3 Imes, and has 

 29 annulations, all of them at right angles. 



To this species I refer, provisionally a specimen collected by Prof. R. 

 Bell, at Rockwood. It is 42 lines in length, and tapers from 11 lines to 

 8 lines, and has 30 annulations. 



Rockwood and Grimsby ; Niagara formation. Prof. R. Bell and J 



Pettit. 



