144 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
chordal ossifications as most nearly suggestive of the 
calcified annuli of the living Chimeroids. There appears 
to me no inherent objection to referring the animal to a 
kinship with the Hags, merely because its skeleton was 
superficially calcified, especially if Dohrn’s views of the 
origin of Cyclostomata by degradation from a truly 
enathostomatous type, and if Walcott’s recently alleged 
discovery of a Chimeroid notochord in the Ordovician 
strata,* should ultimately prove correct. 
X. Note on the-table (Plate VIII). The accompanying 
table+ is intended to give expression to the views advo- 
cated both in this paper and an earlier one.{ In the latter 
I defined the Euthorchidic vertebrata as those in which 
‘vasa efferentia.are unrepresented, and the Wolffian or 
segmental duct is exclusively renal in function’’ where it 
exists; regarding the Nephrorchidic forms as those in which 
‘“‘vasa efferentia are present and the excretory organ is an 
accessory to reproduction in the male,’’ and referring the 
Ganoids, together with the Teleosteans and Marsipo- 
branchs, to the first named series. Its publication 
immediately preceded that of two important papers bearing 
upon the subject in hand. One, by Ryder,§ containing 
much that is valuable concerning the natural history of 
the Sturgeons, but adding little to our knowledge of their 
genitalia; the other by Semon,| confirming Balfour ‘and 
Parker’s description®! of vasa efferentia in Lepidosteus, and 
* Bull. Geol. Soc., America. Vol. III, p. 165. 
+ In the table ‘‘ Ganoidei? all” is intended to exclude the lige Crosso- 
pterygiil (Polypterus and Calamoichthys) pending a sufficient knowledge of 
their reproductive organs. cf. Semon op. cit., p. 634 and Traquair Proe. R. 
S. Edinb., vol. v., p. 659, 1865—66. 
+ Jour. Linn. ae Lond. Zool. Vol. XXIII, p. 556, 1891. 
§ Bull. U.S. Fish Comm. Vol. VIII for 1888, p. 231, 
| Morph. Jahrb. Bd. 17, p. 623._ 
{] Phil. Trans., 1882, p. 413. 
