36 Pisces. 
V. PISCES. 
H. Ayers, Am. Nat. xxvii, 1893, p. 919, continues to regard Protopterus as 
generically inseparable from Lepidosiren. 
* Scaumenacia , n. g., for Phaneropleuron curtum, Whiteaves (foss.); Tra- 
quair, Geol. Mag. (3) x, 1893, p. 2G2. 
Dinichthys lincolni , p. 275, Marcellus Shale, clarki , p. 279, Cleveland Shale, 
and gracilis , p. 279, Cleveland Shale, n. spp. (foss.) ; Claypole, Amer. 
Ceol. xii, 1893. 
On the ventral plates of Holonema and Pterichthys ; H. S. Williams, 
Amer. J. Sci. (3) xlvi, 1893, p. 285, figg. 
O. Jaekel, SB. nat. Fr. 1893, p. 178, remarks on the structure of the 
limbs of the Placodermi. 
Remarks on the gigantic Placoderms of Ohio ; Claypole, Amer. Geol. 
xii, 1893, pp. 89-99. 
OSTRACODERMI. 
Cephalaspis magnified , n. sp. ; Traquair, Ann. Scott. Nat. Hist. 1893, 
p. 206, and P. Phys. Soc. Edinb. xii, 1894, p. 269, pi. vii, Old Red 
Sandstone, Caithness. 
ELASMOBRANCHII. 
ACANTHODII. 
^ Traquairia , n. g. for Acanthodes p>yg menus, Fritsch ; A. Fritsch, Fauna 
d. Gaskohle, iii, p. 50, figg., pis. ciii-cv (1893). 
* Protacanthu8, n. g., allied to the preceding, for P. pinnatus, n. sp. ; 
A. Fritscii, t. c. p. 55, figg., pi. cviii, figg. 1 & 2, Carboniferous, 
Pilsen, Bohemia. 
Acanthodes gracilis , Romer, n. var. hendai ; A. Fritsch, t. a. p. 64, figg., 
Carboniferous, Bohemia and Moravia. 
SELACHII. 
On the spiracular gills of the Selachians ; H. Yirciiow, SB. nat. Fr. 
1893, pp. 31-33. 
On the structure of the nidamentous gland of the oviduct of Selachians ; 
Henneguy, C.R. Soc. Philom. 1893, No. 16, pp. 2 & 3. 
On the blood-vessels of the eye in Selachians ; H. Virchow, SB. nat. Fr. 
1893, pp. 33-37. 
W. A. Locy, J. Morphol. ix, 1894, pp. 115-122, writes on the optic 
vesicles of Elasmobranchs and their serial relation to other structures 
on the cephalic plate. 
H. Rabl-Ruckhard, Anat. Anz. viii, 1893, pp. 728-731, figg., writes on 
the lohus olfactorius impar of Selachians. 
