Maryland Geological Survey 399 



Actwon gabbana Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 156, 



pi. xix, figs. 13 (?), 23-25. 

 Actwon gabbana Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 19. 

 Actaron gabbana Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 807 (ex parte). 



Description. — " Shell of medium size, elongate ovate or subcylindrieal 

 in outline, spire moderately elevated, entire length and number of volu- 

 tions unknown. Body volution cylindrical in the upper half, obtusely 

 rounded below. Aperture narrow, pointed and very contracted above and 

 rounded below, about four-fifths as long as the length of the body volution, 

 measured on the same side. Columella slightly twisted below and marked 

 by a single tooth near the base as determined by the groove showing on 

 the cast. Surface of the shell marked by fine spiral lines, the number 



undeterminable from the specimens examined There appears to 



have been some confusion in the author's mind in regard to the specific 

 relations of this shell, when the name Actceonina biplicata was applied; 

 and also subsequently, as he refers it to a species described by Meek and 

 Hayden from Nebraska. These latter gentlemen, however, disclaim the 

 responsibility of the name, and as none such appears in any of their works 

 we can only conclude that Mr. Gabb was in some way confused, as sug- 

 gested by Mr. Meek in his Invert. Paleont. of the Territories, that Mr. 

 Gabb intended to refer it to A. attenuata; but it certainly is a very distinct 

 species and can never have had so elevated a spire as that one. As the 

 name A. biplicata has been previously used by d'Orbigny for a very distinct 

 species, and as this one appears to be a true Act won , I see no way to avoid a 

 change of name in this case, and therefore propose the name Actwon 

 gabbana as a substitute for that used by Mr. Gabb." — Whitfield, 1892. 



Type Locality. — Tinton Falls, New Jersey. 



Shell small, cylindrical, exceedingly slender; whorls flattened laterally, 

 minutely tabulated posteriorly; spiral sculpture microscopically fine, 

 irregular and evanescent on the posterior portion of the whorl, the sulci 

 increasingly deeper and wider toward the anterior extremity; suture lines 

 impressed. 



