6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



the final whorl is separated something like 3^ mm. from the crest of 

 the nearest part of the previous whorl. The homologous distance on 

 the smaller holotype is less than i mm. This indicates continued 

 divergence of the final whorl. 



Occurrence. — The three specimens were collected in 1889 by the 

 late C. D. Walcott from boulders in the Levis conglomerate near the 

 cemetery at Point Levis, Quebec (Walcott's locality number 115a). 

 Species recorded as being associated are Loganellus logani (Devine), 

 Agnostus americanus Billings, Palaeostrophia elax (Clark) and Levi- 

 sella sp. These are said to indicate the Hungaia zone of the Upper 

 Cambrian. The Hungaia zone however has not yet been placed ac- 

 curately in the standard Upper Cambrian sequence of the Mississippi 

 Valley (Rasetti, 1944, p. 231). However, it is not older than the 

 upper third of the Franconian stage or later than the Trempealeauian, 

 In the opinion of Dr. Christina Lochman Balk ^ the Hungaia zone 

 is close to the upper Dikelocephalus zone in the Trempealeauian. 



REFERENCES 

 Knight, J. B. 



1947. Some new Cambrian bellerophont gastropods. Smithsonian Misc. 

 Coll., vol. 106, No. 17, pp. i-ii. 



KOBAYASHI, T. 



1939. Restudy of Lorenz' Raphistoma broggeri from Shantung with a note 

 on Pelagiella. Jubilee publication in commemoration of Prof. H. 

 Yabe's 60th birthday. 

 Rasetti, F, 



1944. Upper Cambrian trilobites from the Levis conglomerate. Journ. 

 Paleontol., vol. 18, pp. 229-258. 



EXPLANATION OF PLATE 1 

 la-m. Strepsodisciis major Knight, new species. 



la-d, im, the holotype (U.S.N.M. No. 114277). la, left side view. 



lb, posterior view to show skewness. ic, anterior view showing V- 



shaped sinus, id, right side view, all X i- im, right side view, X 2. 

 le-g, a paratype (U.S.N.M. No. 1 14278). le, posterior view, X 2. 



if, g, left and right side views, respectively, X !• 

 ih-j, a paratype (U.S.N.M. No. 114279). ih, posterior view, X 2. 



li, j, left and right side views respectively, X I. 

 ik-1, a paratype (U.S.N.M. No. 114280). Left and right side views, 



respectively, X i- 

 2a-c. Chalarostrepsis praccursor Knight, new species. 

 The holotype (U.S.N.M. No. 1 14282), 

 2a, oblique anterior view to show slit, X 4- 

 2b, left side view, X 4. 

 2c, a portion of the carina (just to right of break shown right of center 



on 2b) showing selenizone with lunulae, X 8. 



^ Oral communication. 



