Prof. E. W. ClaypoU — On a New Carboniferous Trilohite. 303 



EXPLANATION OF PLATE IX. 



Fig. 1. Onustus ornatissimus, D'Orb. Dogger, Blue "Wyke. Leckenby 



Collection. Back view. 

 ,, 2a. b. Onustus pi/)-amidatus, ThilliT^s. Dogger, Blue Wyke. York Museura. 



Type refigured. Back and basal views. 

 ,, Sa, b. Onustus pyramidatus, Pbil. Dogger, Blue Wyke. Leckenby Col- 

 lection. Back and apical views. 

 ,, 4a, b. Nerita minufa, Sowerby, var. tumidula, Pbil. Dogger, Blue Wyke. 



Jermyn St. Museum. Front and back views. 

 ,, 5«, b. lb. lb. var. tumidula, Phil. Dogger, Blue Wyke. 



Leckenby Collection. Front and back views. 

 ,, 6. lb. lb. var. tumidula, Pbil. Dogger, Blue Wyke. 



York Museum. Type of Natica tumidula, 



Phil., EEFiGURED. Frout view. 

 ,, 7,8,9. iVmte ^sewf^o-coste^a, D'Orbigny. Dogger, Blue Wyke. Leckenby 



Collection. Three specimens, each enlarged 



twice. 

 ,, 10a, b. Nerita costidata, Deshayes. Scarborough Limestone, White Nab. 



Herries Collection. Back and apical views, 



enlarged twice. 

 ,, 11a, b, c. Neritopsis near to Bajocensis, D'Orbigny. Dogger, Blue Wyke. 



York Museum. Front, back, and apical views. 

 ,, 12a, b. Neritopsis canaliculata, D'Archiac. Corubrasb, Scarborough. 



Leckenby Collection. Front and back views. 

 ,, 13a, b, Neritopsis ? Guerrei, Heb. and Desl. Kelloway Eock, Scarborough. 



Leckenby Collection. Cast. Front and back 



views, 

 {To be continued.) 



HI. — On the Occurrence of the Genus Baluanites in the 



Lower Carboniferous Eocks of Ohio. 



By Prof. E. W. Claypole, B.A., B.Sc. (Lond.) F.G.S., 



of Buchtel College, Akron, Ohio, U.S.A. 



OF the abounding Trilobites which mark the faunas of the Lower 

 and Middle Palgeozoic rocks few survive into the Upper Palteo- 

 zoic. Three genera, if indeed they really deserve that name, have 

 been described from the Carboniferous beds in England — PMllipsia, 

 Griffitliides and Bracliymetoims. Only the first of these is yet known 

 to occur in American Palceozoic strata. But on the other hand two 

 species of Proetus have been announced from America — a genus not 

 yet recognized in England.^ It is true that the distinctions are so 

 slight that possibly these last might be as correctly referred to Pliil- 

 lipsia as to Proetus. As they stand, however, the distribution of the 

 North American Carboniferous Trilobites is as follows : — 



Distribution of North American Carboniferous Trilobites. 

 Coal-Measures Fhillipsia Cliftonensis, Shum. 1858. 



major, Shum. 1858. 

 Sangamonensis, M. and W. 1865. 

 sciifeJa, M. and W. 1865. 

 Chester Grocp „ Meramecensis, Shum. 1855. 



Stevensoni, Meek, 1871. 

 Keok.uk Group \ ,, Lodiensis, Meek, 1875. 



> Froetus ^ auriculattis,? Ha.]l, 1861. 



Cuyahoga Shale ) Fhillipsia bufo, M. and W. 1870. 



^ Dr. Woodward noticed a pygidium of Froetus from the Carboniferous Limestone 

 of DubKn. See Geol. Mag. 1883, p. 446 (woodcut).— Edit. Geol. Mag. 

 2 Assigned in Miller's Catalogue of N. A. Palseozoic Fossils to the Chemung Gr. 



