NOVA SCOTIAN GEOLOGY — HONEYMAN. 131 



m. of the posterior 12 m. m. There is a deep fossette on the 

 back part of the frontal lobe, a little above the anterior furrow. 

 It is papillose or coarsely granular except in the space between 

 the lateral furrows, there being only two tubercules from the 

 curve of the fossette to the occiput. All the species that have 

 been found in the " Upper Arisaig series " with the exception of 

 Dalmania logani occur in B, or Clinton, none of them are 

 papillose. Regarding the species as new, I have named it 

 Dalmanites gilpini. 



9. Strophomena alternate: does not occur in our " Upper Ari- 

 saig series," but it is of frequent occurrence in the " Wentworth 

 series " of the Cobequid" mountains, which I have correlated with 

 the Hudson river or Cincinnati period (Lower Silurian). 



10. Athyris of several species are found in the forms of casts. 

 This genus prevails in the lowest part of the " Upper Arisaig 

 series," being generally associated with corals, which were re- 

 ferred to the genus Petraia by Mr. Salter. The Athyris then dis- 

 appears to reappear in great force in the Lower Carboniferous 

 Limestone. 



11. Spirifera are abundant here as at Nictaux, especially in 

 the Iron mines. It is the prevalence of Spirifera that makes 

 me hesitate in placing the Asaphus ? strata lower than the middle 

 Silurian. In the "Upper Arisaig series" Spirifera are most 

 numerous in the Middle Silurian division. 



14. Maclurea, s. p. — The form which I referred to the genus 

 Maclurea, occurs in the specimen of quartzite referred to in my 

 Diary (Tuesday, lothj associated with the Cruciform organism. 

 It is a cast of the top of the shell or ivhorl. The width of the 

 cast is 2.7 x 2 inches, its depth, .7 inches. 



15. Bellerophon trilobatus. Several specimens of this Het- 

 eropod were found at the mines. It differs from the Bellerophon 

 trilobatus of Arisaig in the form of its middle lobe. It is not so 

 rounded, being rather acute, so that it may be regarded as an 

 older variety. Bellerophon trilobatus is not found in the Middle 

 Silurian of the " Upper Arisaig series." Its first appearance is in 

 its crinoid strata, at the base of C, the Upper Silurian. 



16. Theca, sp. is very much like Theca triangularis of the 



3 



