25 



(JANUARY, 1862.) 



LITUITES APOLLO. (N. sp.) 



Description Coil 5 or 6 inches across ; the first 2i whorls in contact, 

 after which they gradually separate so that at the completion of the third 

 whorl they are 1 inch distant from each other. The diameter of the coil 

 is then about 6 inches and the tube about 1 inches in the lateral diame- 

 ter of the transverse section, in the dorso-ventral a little less. In the 

 third whorl there are about five septa to the inch. The surface is marked 

 by numerous shallow concave undulations which curve backwards from 

 the umbilicus and make a deep retral sinus on the ventral aspect. The 

 ridges of the undulations are narrowly rounded and not so wide as the 

 concave grooves between them ; the latter are 2 or 3 lines in width. 

 Siphuncle unknown. 



This species somewhat resembles L. undatus Pal. N. Y. Vol. 1. p. 52. 

 PL 13, figs. 1. la, but the tube does not taper quite so rapidly and is not 

 flattened on the ventral side as it is in that species, the transverse section 

 being nearly circular and rounded on the ventral as on the lateral 

 aspect. 



Locality and Formation. Mingan Islands, Calciferous formation and 

 also apparently in the Chazy. 



Collectors. Sir W. E. Logan, J. Richardson. 



LITUITES PALLNURUS. (N. sp.) 



Description. The coil in the largest specimen seen is 4J inches across 

 and consists of about five whorls very compactly inrolled, each deeply 

 indented by the ventral side of the one next preceding. The transverse 

 section of the tube (with the exception of the indentation on the dorsal 

 side made by the preceding whorl) is nearly circular. The diameter at 

 about the end of the fifth whorl varies from 11 to 15 lines. The septa in 

 the only specimen in which they have been observed are (in the third 

 whorl) five or six to the inch. Surface and siphuncle unknown. 



Of this species I have seen only one specimen that shews any part of 

 the free portion of the tube. The separation commences about the middle of 

 the fifth whorl. The length of the produced free portion is not known. 

 No other species known in our rocks is so compactly coiled as this, there 

 being about i of the diameter of each whorl overlapped and concealed by 

 the one next succeeding. 



Locality and Formation. Mingan Islands, Calciferous formation. 



Collectors Sir W. E. Logan, J. Richardson. 



c 



