Galtensis is a little the older name, as may be seen from the fact that the 

 first part of this volume is quoted from, more than once, in Professor Lind- 

 strom's monograph. 



EuoMPHALUs ciECiXATUS, Whiteaves. 



Ecculiomphalus circinatus, Whiteaves. This volume, pt. 1, p. 35, pis. 5, figs. 4, 4, a-c, 

 and 8, fig. 5. 



Gait and Hespeler, T. C. Weston, 1867; Elora, D. Boyle, 1878; Dur- 

 ham, J. Townsend, 1878-84. 



Professor Lindstrom says *that the genus Ecculiomphalus was originally 

 based by Portloek upon two shells which are expressly stated to bear 

 " great resemblance to an unrolled Euomphahis." Since then Ecculiom- 

 phalus has been made to include " species of evolute Euomphali and like- 

 wise evolute Pleurotomarice. It must, consequently. Professor Lindstrom 

 thinks, " be broken up and its species distributed in these genera." In 

 view of these remarks, Ecculiom-phalus circinatus appears to the writer to 

 be a sinistrally coiled evolute Euomphalus. Further, Professor Lindstrom 

 has shownf that in Euomphalus Ootlandicus the shell may be either 

 involute with the whorls everywhere in contact, or evolute and loosely 

 coiled, also that its volutions are coiled indifferently to the right or to the 

 left. Hence it is not at all improbable that E. circinatus may prove to 

 be merely an evolute sinistral variety of E. Galtensis, though at present 

 no specimens with characters intermediate between these two forms have 

 been seen by the writer. 



Professor James Hall has applied the name Phanerotinus, Sowerby, to 

 the uncoiled species of Euomphalus, but the type of the genus Plianero- 

 tinus, the Euom,phalus cristatus of Phillips, is stated by that palaeontolo- 

 gist to be provided with a "large double dentated keel, continued to the 

 inner whorls." 



LOXONEMA BOYDII, Hall. 



Loxonema Boydii, Hall 1843. Rep. Fourth Geol. Distr. N. Y., p. 138, fig. 



3 {?). 



Murchisonia Boydii, Hall 1852. Pal. N. York, vol. II., p. 346, pi. 83, fig. 3. 



" " Billings 1863. Geol. Canada, p. 399, fig. 345. 



Gait, A. Murray, 1847, and E. Billings, 1857 ; Hespeler, T. C. Weston, 

 1867 ; and Durham, J. Townsend, 1878-82. 



After the brief description of Murchisonia Boydii in the second volume 

 of the Palaeontology of the State of New York, Professor Hall says : " the 



^Silurian Gastropoda and Vteropoda of Gotland, p. 138. 

 +Ibid., on pi. xiii, figs. 19-31. 



