TIM I." ' '''.''.' 



AJRTHROPODA. 



su.K-ia.ss CRUSTACEA. 



on.,, TRID HJITA. 



Family ' A I.Y M M K.\ I ! 



us CALYM.MF.Ni:. Hrongniiirt, 1822. 

 CAI.YMMENK CALLICEPHALA Green, 1832. 



Cali/mmfnr eallierphala GKKEN, 1838. Monogr. Trilobltea N. Anier, p. 30, cast 2. 



tnaria MF.KK, 187S. Palaeontology of Ohio, vol. I, p. 171): pi. 14, ttgn. 14a/. 



There are a number of small and quite perfect inli\i<luals from the Galena horizon 

 which agree in all essential features with Ohio fossil. While following Mr. S. A 

 Miller and later writers in employing Green's designation for this species, I feel that 

 there is still a shadow over its accuracy, for the following reason: The specimen 

 upon which the pperies was founded and which was very accurately reproduced in 

 Green's cast No. 2, was an extended individual, showing the peculiarly broad axis of 



i Outli nalon of C<ilymmrnr cnllicej.hnta C7r-<-n. From the cast of Ihi: original. 



the Cincinnati -perimen-. l>ut having a very short glabella. The latter had been 



somewhat al>ra<leil. ^iviiijiit ajinarently aluiormal width, ami I have not seen another 



uplf in which the wi.lth at the base is so great compared with the length of the 



^laliella. and at the same time the anterior edge of the glabella so remote from the 



frontal extremity of the cephalon. T<> indicate this structure I have introduced an 



outline figure of the cephalon taken from this cast. It is stated in the original 



ription that this specimen was labeled in the collection of the Philadelphia 



Mixeam as from Hamp-lr -mia: the author, at the -amr time speaking of 



others from the Miami river and near Cincinnati. There is. thus, no doubt of hi^ 



'ion to include the well known Ilnd-on Hi\er form under thi- name: 



