317 



pared sections, some of wliich that gentleman very kindly [)i-esented to 

 Mr. ^mi. 



Several sul^-excursions were held at which the Trenton formation 

 was examined, and at one of these, the excavations being carried on 

 beside tlie Water Work s office, a fine specimen of Fleurocystitesfilitextus, 

 Billings, was obtained, and close to it a species of C yclocystcides . 



Utica Formation. — Early in the spring (1885) Mr. Ami had 

 an opportunity of visiting the exposures of this formation in company 

 with Prof. C. D. Walcott, Palasoutologist to the Geological Survey of 

 the United States, whose v.-ritings on the " titica " are to well known 

 that mere mention is necessary to associate the two. On this occasion, 

 as usual, a large number of forms were found, so that Prof. Walcott 

 was enabled to examine a number of species regarding which it was desir- 

 able to obtain his opinion. For instance, the graptolite described by 

 himself under the name of Graptolithus annectmis — a form most probably 

 referable to the genus Leptoyraptus — was collected and recognised by 

 liim. The bi'acliiopod at times referred to Orthis testiidinarla, Dalman, 

 and again to some other species, proved to be Zjyospira modesta, Say. 



A Pholidops was also collected Inre, and numerous specimens of 

 Trhrthrus spinobus, Billings, Avith three spines on the posterior thoracic 

 segments, together with T. Becki, Greene, adult and young, and other 

 species. 



Siphonot'reta Scotica, Davidson, is a form which was described by Mr. 

 Whileaves as occurring in this formation, but nothing fuither was known 

 than that the specimens had been collected from rocks of supposed Utica 

 age about the property of Mr. J. W. H, Watts, loose, or from some 

 excavation in the neighbourhood. Having ascertained the association of 

 species and the lithological chai'acter of the rock in which the species 

 was found, ]Mr. Ami proceeded in company with Mr. Fred Hayter, an 

 active worker in geology, to the Gloucester side of the Jjittle Rapids, 

 near the rifle range, on the Rideau river, as the rocks of that locality 

 bore a strong resemblance to those holding the Siphonotretce collected up 

 to date. The first band examined was that holding the Conularia in 

 abundance ; a bed of impure limestone teeming with remains of this 

 jjteropod and brachiopods belonging to the genera Zygospira, Orthis 

 and Loptena. Discina Fdoiiea was also found here, but no trace of 



