248 IOWA GEOLOGICAL SURVEY 



atus. Trunk robust, its maximum depth twice as great as that 

 of the .caudal pedicle. Anal and paired fins situated as in the 

 typical species (C. granulatus Ag.), the greater part of the 

 caudal and both dorsals not preserved. Operculum and cheek- 

 plates ornamented with numerous fine antero-posteriorly di- 

 rected spiniform ridges, their position being indicated in the 

 worn condition by faint tubercles. Scales ornamented with nu- 

 merous fine raised lines of ganoine, more or less continuous and 

 rectilinear, but when worn assuming the appearance of elon- 

 gated tubercles. Scales along the lateral line with prominent 

 raised tubules directed parallel with the body axis. 



The unique and in many respects remarkable specimen answer- 

 ing to the above description, and shown in the accompanying 

 half-tone figure (Fig. 36), was discovered a few years ago by 

 Dr. Stuart Weller, of the University of Chicago, in the course 

 of his investigation of the Kinderhook fauna of Iowa and ad- 

 joining states. In recognition of his important work, and for 

 the rest, as hommage d' esprit, we have pleasure in dedicating 

 the specific title of the new form brought to light by him in his 

 honor. The exact horizon whence the specimen was obtained 

 is the blue shale bed at the base of the Kinderhook limestone 

 near Burlington, Iowa. An analysis of the fauna occurring in 

 this bed, designated as No. 1 in the local section, is given by 

 Dr. Weller in volume X (1899) of the Iowa Geological Survey 

 Reports, p. 69 seq. The peculiar relations of this assemblage 

 are thus noticed by the author in the course of his general re- 

 marks (p. 70) : 



"The fauna of this bed is a most interesting one, it probably 

 being the oldest of the Kinderhook faunas of the Mississippi 

 Valley. The presence of typical forms of the genus Productus 

 gives to the fauna a strong Carboniferous aspect, the undeter- 

 mined species of Productella and Gomphoceras being the only 

 members which are suggestive of the Devonian, unless the fish- 

 remains should show some such alliance. The fauna is really 

 more strongly Carboniferous in aspect than is that of bed No. 

 2, whose large number of pelecypods are for the most part 

 allied to Devonian species in New York. For the satisfactory 

 study of this fauna, however, larger collections than are now 

 available must be secured, and as soon as the necessary material 



