Structure of Paleozoic Barnacles. — Clarke. 143 
family are very remote. It would be in much closer accord 
with our knowledge of these bodies, incomplete though it may 
be, to place them in a separate family, the Turrilepadida . 
and to dissociate them at the same time from the somewhat 
similarly constituted but more primitive bodies, Lepidocoleus, 
by placing the latter in a distinct family, Lepidocoleidai. 
Explanation of Plate VII. 
Lepidocoleus sarlei, sp. nov. 
Figs. 1 and 2. Opposite sides, showing the narrow, ribbon-like expo 
sure of the plates upon the lateral surfaces. X2.3. 
Fig. 3. The dorsal edge, showing the axial position of the terminal 
plate and the mode of interlocking of the plates near the extremity. 
The apices of the plates of the two rows do not come into actual contact 
but are separated by a groove, along which it is to be presumed that 
the plates interlock as do those near the caudal end. X2.3. 
Fig. 4. The ventral edge, showing the alternating positions of the 
plates in the two rows. X2.3. 
Fig. 5. The ultimate and penultimate plates of the right side: the 
former is the caudal or apical plate. X4.G. 
Fig. 6. The last two plates of the left side. The ultimate plate here 
is overlapped by the edges of the caudal plate. X4.6. 
Niagara .simles, Rochester, A. V. 
Lepidocoleus polypbtalus, sp. nov. 
Fig. 7. The exposed surface of the original specimen. X2.3. 
Fig. 8. A portion of the flattened dorsal surface of the concealed 
side. X2.3. 
Loirer Helderberg group, Albany county, A. Y. 
Lepidocoleus jamesi (Hall and Whitfield) Faber. 
Fig. 9. An outline copy of one of Mr. Faber 's figures. X2.3. 
Hudson River group, Cincinnati, Ohio. 
Turrilepas wrightiana ide Koninck) Woodward. 
Fig. 10. An outline copy of Woodward's figure. Natural size 
Wenlock limestone, Dudley, England. 
Strobilepis spinigera Clarke. 
Fig. 11. An approximate restoration of the form of this fossil, viewei 1 
from the side, showing the ventral row of spines and the dorsal row of 
small plates. 
Fig. 12. A dorsal view of the same. Slightly enlarged. 
Hamilton shales, Canandaigua lake, N. )'. 
