PAGE. 



Figs. 33 to 35 LOPIIOSPIRA (?) NOTABILIS Ulrich 990 



Three views of an almost perfect silicifled shell of this remarkable species. 

 Black River limestone of central Tennessee. 



Figs. 36 to 39 LOPHOSPIRA TROPIDOPHORA Meek sp., instead of MULTIGRUMA Miller sp.* 978 



36 and 37 Opposite views of a large specimen showing the usual characters of the species. 

 Lorraine group, Newport, Kentucky. 



38 Portion of the last whorl of a smaller example on which the surface markings 



are better preserved, x2. Richmond group, Butler county, Ohio. 



39 A variety from the Richmond group at Madison, Indiana, in which the whorls 



descend more slowly, causing a wider apical angle. 



Figs. 40 to 43 LOPHOSPIRA BOWDENI Safford sp 986 



40 A large specimen, imperfect at both ends, presenting the usual characters of 



the species. Richmond group, Boyle county, Kentucky. 



4! and 42 Two specimens, from the same locality, showing the extremes, respecting the 



relative hight of the spire, so far observed. 

 43 Last whorl, with aperture slightly restored, of the original of flg. 41. 



Figs. 44 to 47 LOPHOSPIRA SPIRONEMA U. and S 983 



44 and 45 Opposite views of a specimen from the Ctenodonta bed of the Black River 

 group, at Chatfleld, Minnesota. 



46 Another specimen from the same bed near Cannon Falls, Minnesota. 



47 Portion of surface and outline of right side of last whorl of flg. 46, X 10, showing 



the delicate cancellation of the surface and the angular form of the peripheral 

 band. 



Figs. 48 to 50 LOPHOSPIRA TENUISTRIATA Ulrich 983 



48 Nearly perfect example from the Utica group at Newport, Kentucky. 



49 The peripheral band of another specimen from the same locality, xlO. The 



fine revolving lines which occur both above and beneath the band are not 

 shown in the drawing. 



50 Small portion of the surface between the band and the lower angle, xlO, 



showing the strong lamellar lines of growth, fine intermediate lines, and an 

 unusnal degree of irregularity in the direction of the spiral lines. The 

 remarkable preservation of the more delicate markings on these specimens 

 is due to the fact that they were protected by a thin parasitic bryozoan 

 (Leptotrypa clams Ulrich) which, on being removed, left them as distinct as 

 during the life of the mollusk. 



Figs. 51 to 55 LOPHOSPIRA SERRULATA Salter sp 968 



(See also plate LXX1II, flg. 67.) 



51 An average cast of the interior. Stones River group, Belolt, Wisconsin., 



52 The empty mould of the exterior of a specimen of about the same size and 



character as that of which flg. 51 represents an internal cast. Beloit, 

 Wisconsin. 



53 Gutta percha impression of a natural mould of the exterior of a shell having 



the whorls in contact through a longer period than usual. Shows the wavy 

 peripheral plate very distinctly. Janesville, Wisconsin. 



54 A small cast of the interior from Minneapolis. The four or flve other specimens 



of this species seen from the limestone at Minneapolis are all like this in 

 size and character. 



f"> The cast of the last whorl of an unusually large shell, figured so as to show 

 the anter or outline of the outer lip. (Compare with flg. 26.) Janesville, 

 Wisconsin. 



Figs. 56 to 69 LOPHOSPIRA (?SEELYA) LIRATA Ulrich 988 



56 A specimeh with numerous spiral ridges on the basal part of the volutions. 



Utica group, Newport, Kentucky. 



Portion of the lower part, including the band, of the last whorl of same, X 3. 

 Part of the last whorl of a specimen of the form (var. obsokta) having but a 

 single spiral line beneath the peripheral band, X 3. Also from Newport, 

 Kentucky. 

 69 Upper surface of whorl viewed from above, x3, showing interpolation of strise. 



Since page 978 as printed we have come to the conclusion that this species Is not distinct from Meek's Pleuroto- 

 maria IropMopftora (I'al. Ohio, vol. 1, p. 1M, pi. XIII, flga. 6<i and 6/<). Our references to the shell should therefore be 

 corrected by changing the name to Istphotplm troplduphurn Meek sp. 



