2 ON THE HYPOSTOMA OP ASAPHUS CANADENSIS. 



torn a was attached to the under side of the glabella, 



are also in part concealed. Delicate, irregular striae 



are seen on each side of the hypostoma ; and two 



small pits occur, one on each side, at about two-thirds 



of the distance between the buccal points and the 



base — our specimen agreeing in this respect with the 



hypostoma of Asaphus jolati/cejpJialus (= Isotelus Amph^rcZtdZni. 



gigas^). The space in the centre, between the pits, is somewhat 



raised. 



This hypostoma is chiefly interesting as proving our species to be 

 a true Asaphus, and not an Ogygia, with which in other respects it 

 has certain affinities. In the Ogygia type, the hypostoma presents 

 an oval outline at its buccal extremity. 



II. ASAPHTJ8 HIFCKSII. 



(A New Species.) 

 Our colleague, the Rev. William Hincks, Professor of Natural 

 History in University College, Toronto, having been lately on a 

 botanical excursion to the Blue Mountains near CoUingwood, in 

 Canada West, collected at the same time a few fossils ; and these he 

 has had the kindness to place in our hands. Together with the 

 more common or typical species of the TJtica slate (Qraptolithus 

 priodon, Triarthrus BecTcii, Asaphus Canadensis, &c.), there is a 

 nearly perfect specimen — so far as regards its outline — of a trilobite 

 closely related to Asaphus platycephalus. It occurs in a piece of 

 limestone, a portion apparently of one of the calcareous bands inter- 

 stratified amongst the bituminous shales of the Utica slate. Tor 

 the information of distant readers, and those unfamiliar with our 

 geology, it may be stated that the TJtica slate belongs to the Lower 

 Silurian series — beyond which, with us, as in Europe, the genus 

 Asaphus does not appear to pass. Although exceedingly opposed to 

 the extreme multiplication of species, so prevalent amongst palseon- 

 tologists of the present day, we are compelled, almost against our 

 will, to regard this CoUingwood trilobite as new. "We beg therefore 

 to name it after the E-ev. Professor Hineks, from whom we received 

 the specimen. The general form is that of a narrow oval, with the 

 longer to the shorter or transverse axis about as 5 to 3« The length, 

 in proportion to the breadth, appears somewhat greater than this, 



* Also mtta that of A> tyrarmws, Murchison, and other European species. 



