282 UNITED STATES GEOLOGICAL SURVEY OF THE TERRITORIES 



However that may be, judging from his figure of the New Jersey shell, I should 

 think it entirely distinct from our species, which differs in form, and almost 

 certainly has not two plications on the columella, while Mr. Gabb's enlarged 

 figure of the surface-markings of his shell does not show any indications of 

 punctate striae. He doubtless also wrote the name Actceonina by a slip of the 

 pen for Action or Actceonella, as the plications mentioned on the columella 

 would exclude it from Actceonina; but its other characters would also exclude 

 it from Actaoneila ;is properly restricted 



As with the last, in adopting the conclusion thai Aileron would have to 

 be regarded as a synonym of the older name Solidula, we have elsewhere 

 ranged this species under the latter name. It' the two are to stand as distinct 

 genera, however, this shell must fall into Actceon, and not into Solidula, both 

 on account of its extreme thinness and almost certainly in consequence of not 

 having more than one fold on its columella. 



Locality and position. — Yellowstone River, one hundred and fifty miles 

 from its mouth; from beds containing a blending of the fossils of the Fort 

 Pierre and Fox Hills groups of the Upper Missouri Cretaceous series. 



RINGICULID/E.* 



Genus CINULIA, Gray. 



Synon— Cinulia, Gray (1840), Synou. Brit. Mus., 62,90; and (1842) ib., 62, 00 ; also (1847) Proceed. Zool. 

 Soc, L60.— Woodward (1856), Man. Conch., 180.— Meek (1863), Am. Jour. Sci. and 

 Arts, XXXV. 93 : and ( lsii4) Smithsonian Check-List X. Am. Cret. Fossils, 16.— Briart 

 and Cornet ( 1865), Descr. Min. Geo], et Paleont. de la Menle de Braconegines, 30. 

 Avellana, d'Orbigny (1843), Paleont. Fr. Terr. Cret,, II, 133.— Reuss (1844), Verst. Bouui., 50.— 

 Chenu (1859), Man. Conch., 1,223.— Meek (1863), Am. Jour. Sci. and Arts, XXXV, 92 (as 

 a subgenus under Cinulia). — Gabb (I860). I'ala-ont. California, II, 2t>4 (as a genus). — 

 Stoliczka (1870), Palaxmt. Indica, II, 405 (as a distinct genus). 



Etym.— ? 



Type. — Auricula globulosa, Deshayes. 



Shell globose, or subglobose ; body-volution comparatively large ; spire 

 short, sometimes abruptly attenuate; aperture narrow, arcuate, sometimes a 



* In a note appended to the .Smithsonian Check-List of North American Cretaceous Fossils, pub- 

 lished i . isd4, I mentioned having been permitted by Dr. Stimpson to examine a drawing, made by him, 

 of the animal of a Rmgicula that he had dredged alive on the coast of Chiua, and remarked that from the 

 structure of the animal of this genus, as shown in this drawing, I regarded it as being typical of a new 

 family Ilingiculidat, including Bingicula, Cinulia, Avellana, and Luplyrha (siuce changed by me to 

 Eriptycka, Eitptycha being pre-occupied). 



According to Dr. Stimpson's carefully-prepared drawing, the animal of Ringicula would seem to 

 lie entirely without eyes, and to have its foot produced beyond the head"( which it equals in breadth), 

 its anterior extremity being transversely truncated, and a little sinuous. It is also provided with a 

 huge siphon-like organ that it carries folded back on the shell between two short and broad tentacular 

 lobes, also folded back. The foot likewise shows a curious longitudinally oval opening, with crenate 

 margins, on the left side. 



