86 BEPORT OF THE 



shall Group are rather imperfect ; but I haye had the opportu- 

 nity to examine a large number of transverse sections of the so- 

 called Clymenia, and in every case I find indications of a siphon 

 closely internal, while in an equal number of cases, the best 

 possible observations upon the dorsal surface have failed en- 

 tirely to disclose a siphon in this -position. At the same time, 

 it must be admitted that some of Sandberger's figures of 

 " Goniatites" present a close resemblance to some of my Clyme- 

 nise— for example, Figs. 13, 14a Taf. III., and lie Taf. VIII. 

 Even the sectional view, 11a, Taf. VIII., presents much the ap- 

 pearance of some of my specimens ; but while the specimen 

 here figured may have a dorsal siphon, my own specimens have 

 not. 



Further, many of the Goniatites (now so-called), figured by 

 DeKoninck, afford to my eye no indications of an external 

 siphon. I have specimens from Kockford, Ind , generally re- 

 puted identical with DeKoninck's O. rotatorius and G. princeps, 

 (properly O. Ixion and O. Oweni, Sail, ) and while I admit that 

 the latter has a distinct dorsal siphon, I confess that the former 

 seems to me to have a distinct ventral one ! 



Such were my convictions at the the time of Prof. Hall's 

 visit to Ann Arbor, near the close of November last. In view 

 of the contradictions, I showed him some of my specimens, and 

 without making a critical examination, he did not dissent from 

 my conclusion as to their generic relations. More recently, how- 

 ever, in a letter accompanying a copy of his " Contributions to 

 Palaeontology," for 1858-9, and '60, he says, with reference to 

 specimens in his possession from New York and Indiana: " On 

 reviewing my specimens after my return home, I do not find 

 reason to doubt their Goniatitic character.'' And with reference 

 to my specimens, he adds, " The appearance of siphuncle on the 

 ventral side, which you pointed out, is, I think, deceptive." In 

 accordance with this view, he has referred to Goniatites all of 

 the closely coiled Cephalopods, characterized in this last num- 

 ber of his " Contributions." If, on careful examination of my 

 specimens, Prof. Hall should pronounce them Goniatites, I 



