1 8 Bulletin of Laboratories of Denison University [Voi. xi. 
Gastropoda. Bellerophon sp. 
Crustacea. Proetus crassimarginatus. H. 
The most abundant species is Favosites gothlandicus . The 
brachiopod Spirifera gregaria is interesting because of its un- 
usual width. One individual was found having a width of i i-8 
inches. Hall gives the maximum width of the species 7-8 of 
an inch. These forms also have less curvature of the ventral 
beak than other Ohio specimens. They have 10 ridges on each 
side of the fold and sinus. The unusual width and diminished 
gibbosity of these individuals give them an abnormal ap- 
pearance. 
The common species Artypa aspera and Leptaena rhomboi- 
dalis are here conspicuous by there absence, while Bpirife^a zic- 
zac, which is elsewhere uncommon beneath the bone-bed is 
rather plentiful. 
The section evidently belongs a short distance below the 
bone-bed. This is best shown by Eridophyllum verneuilanum. 
None of the forms restricted to the lower part of the Marble 
Cliff section are found here. 
HARRISBURG. 
The stone is quarried at this place along the banks of Big 
Darby creek. The exposed section does not exceed 12 feet. 
The rock is burned for lime and is used for foundation purposes. 
It is worked on a small scale. The following species were 
collected : 
Ahthozoa. Gyathophyllum corniculum. Cystiphyllum 
ohioense. Nich., Favosites emmonsii. Rom., Favosites turbin- 
atus. Bill., Heliophyllum halli. E. & H., Michelinia cylindrica. 
Syringopora tabulata. E. & H., Zaphrentis compressa. Edw., 
Zaphrentis prolifica. Bill. 
Brachiopoda. Amphigenia elongata. Van., Atrypa retic- 
ularis. Linn.,^Miristella nasuta. Con., Pentamerella arata. Con., 
Rhipidomella livia. Bill., Ryhnchonella tethys. Bill., Spirifera 
acuminata. Con., Spirifera fimbriata. Mort., Spirifera macro- 
thyris. H., Spirifera manni. H., Spirifera varicosta. Con., Or- 
thotetes chemungensis. Con., Stropheodonta ampla. H.^ Stro- 
