PLEUEACANTHIDiE. 
5 
P. 1728. Eemains of the head and anterior portion of the trunk ; 
Klein Neundorf, near Lowenberg, Silesia. A few teeth 
are shown, having the coronal cusps smooth. 
Egerton Coll. 
P. 3179. A similar specimen, exhibiting more of the trunk, but no 
teeth ; Klein Neundorf. EmiiskiUen Coll. 
P. 3180. Head and anterior portion of the trunk, upper and lateral 
aspect ; Klein Keundorf. The cartilages of the appen- 
dicular skeleton and the axial skeleton of the trunk 
exhibit distinct nodular calcifications, having thus a 
“beaded” appearance. Enniskillen Coll. 
P. 3181. Portion of trunk, showing imperfect pelvic girdle and fins ; 
Klein Neundorf. Triangular calcifications are distin- 
guishable, and may be either the bases of the arches or 
elements in the sheath of the notochord. Enniskillen Coil. 
40046. Portion of trunk, preserved in counterpart, showing the 
supporting cartilages of the dorsal fin more numerous than 
the neural spines ; in nodule from Lebach, near Saar- 
briicken, llhcnish Prussia. The bases of the neural and 
ha3mal arches exhibit triangular expansions, and no dis- 
tinct calcifications are observed in the sheath of the noto- 
chord. Purchased, 1806. 
40047. Head and anterior portion of the trunk, preserved in coun- 
terpart; Lebach. The coronal cusps of the teeth are 
smooth. Purchased, I860.. 
II. Species founded upon spines. 
Pleuracanthus laevissimus, Agassiz. 
18.37. Pleuracanthm Usvksimus, L. Agassiz, Poiss. Foss. vol. iii. p. CO,, 
pi. 4o. figs. 4, 6. 
1843. Pleuracant/ms planus, L. Agassiz, tom. cit. p. 177 (name only). 
1873. Plettraeanthus Imvissimus, T. P. Barkas, Coal Meas. Palroont. 
p. 17, pi. i. figs. 14-lC. 
1875. Pleuracanthus lavissimus, .1. Ward, [Proc.’J N. Staffs. Nat. Field- 
Club, p. 236. 
1880. Compsaeanthus major, J. W. Davis, Quart. Journ. Geol. Soc. 
vol. xxxvi. p. 62, woode. fig. 2. 
1880. Pleuracanthus leevissimus, J. W. Davis, loc. cit. vol. xxxvi. p. 32.5. 
1880. Pleuracanthus erectus, J. W. Davis, loc. cit. vol. xxxvi. p. 320, 
woode. fig. 2. 
