APPENDIX. 



427 



To the list of Pteropoda from the Devonian rocks of lakes Manitoba 

 and Winnipegosis, on pages 342 and 343, add the following : 



TeNTACTJ LITES PARVULUS. (N. Sp.) 



Fig. 5. T( nfaculiltx luirml iix. :i. Side view of a specimen natural size; h, the 

 same enlarged six times ; and c, portion of the same, enlarged twenty-four 

 times, to show the surface mar]cings. 



Shell (or rather cast of the interior of the shell) very small for the genus, 

 averaging about three, and rarely exceeding three and a half millimetres 

 in length, of the usual narrowly attenuate-conical shape. Surface of the 

 cast marked by very numerous, close-set, minute annulations or transverse 

 raised ridges, which are rathei' variable in their arrangement and propor- 

 tionate size. In some specimens, or in different parts of the same 

 specimen, they are either very close-set and uniform in size, or alternately a 

 little larger and a little smaller, or of equal size but not quite so close 

 together. Test unknown. 



North side of Manitoba Island, J. B. Tyrrell, September 19, 1897; a 

 flat piece of limestone of irregular shape but (roughly) about five inches 

 by three, with its exposed and weathered surface strewn with numerous 

 specimens of this species, which seems to be well characterized by its very 

 diminutive size and close set, rib-like annulations. The lengths of the 

 smallest of the Devonian species of Tentaculites described and figured by 

 Hall in the second part of the fifth volume of the Palwontology of the 

 State of New York, are stated to be as follows : Tentaculites spiculus, 

 longest specimens, eight to ten millimetres, ordinary ones, four to six ; 

 T. attenuatus, ten to twelve mm., rarely a little more ; T. heUulus, fifteen 

 to twenty-two mm. 



