7T- 



74 NEW YORK STATE MUSEUM 



Whitfield from the Guelph dolomites of Carlton township, Wisconsin. 1 This 

 so called Loxonema, however, is a species of large proportions (Whitfield 

 states that the probable length estimated from the two whorls which consti- 

 tute the original specimen was fully 8 inches), rather square shouldered 

 whorls and so far as known, smooth surface. The fine preservation of the 

 Rochester specimens does not justify the reference of them to either Loxo- 

 nema or to this species provided it prove a Loxonema. We have little 

 doubt that the Guelph shell figured by Whiteaves (specimens are from Gait, 

 Hespeler and Elora) as L o x. magnum is specifically identical with, if 

 smaller, than the New York specimens of Horm. whiteaves i, and we 

 propose therefore the change of name here adopted, taking however as the 

 type specimens of the species those we have here figured. 



The generic term Hormotoma which was introduced by Salter for Mur- 

 chisonias of terete form and rounded whorls has been quite generally placed 

 by authors back among the synonyms of Murchisonia. Lindstrdm so treats 

 it and at the same time employs the term Loxonema for shells in which 

 among the longitudinal sinuous lines are extremely fine and crowded. 



macrochllina Bayle. 1 880 

 Macrochilina sp. indet. 



Plate 10, fig. 18 



This is a very diminutive shell from the Rochester Guelph, with sub- 

 equally rounded oblique whorls, three in number, the last rapidly increasing 

 in hight, but all relatively narrow. In these respects it is unlike the various 

 species described (mostly by Billings) as Holopea from various Canadian 

 localities of the Guelph. The surface so far as preserved appears to be 

 smooth and without slit band. 



1 Geol. Wisconsin, 4:317, pi. 24, fig. 1. 



