On some Ungual Phalanges. 307 



EXPLANATION OF THE PLATES. 

 Plate XV. 



Fig. 1. Sucking-disk of Remora. After Jordan and Evermann, lflOO. 

 Fig. -J. Leptechcneis naucrates. After Jordan and Evermann, 1900. 

 Fig. 3. Remora brachyptera. After Jordan and Evermann, 1900. 

 Fig. 4. Echeneises adhering to a vessel. After von Cuba, 1536. 



Plate XVI. 



Fig. 5. Imperato's " Echenei, sev Remora/' 1599, the earliest-known 



figure of scientific value. 

 Fig. 6. Aldrovaudi's Remora, 1013. 

 Fig. 7. Sucking-fish attached to a shark. After Geare. Courtesy of 



'Scientific American.' 



Plate XVII. 



Fi'j. 8. Ko nmandorkaptein Kroepelien's sketch of a vessel in " Dead- 

 Water.'' After Ekman. 



Fiij. 9. Photographs (from the side) of ' Fram ' model in experimental 

 tank; fresh water coloured light, salt water dark. A, R, 

 and C in dead-water with the towing-force gradually in- 

 creasing ; D at high speed, without dead-water. 



XXX. — The Ungual Phalanges termed Mylodon australis by 

 Krefft, Spelaean Animal vel Thylacoleo by Owen, and 

 Tliylacoleo by Lydekker. By R. Etheridge, Jnr., 

 Director and Curator of the Australian Museum, Sydney, 

 New South Wales. 



[Plates XVIII.-XX.] 



I. The Ungual Phalanges (Mylodon aubtbalis) 

 of Krefft. 



When a name has crept into print and is in the course of 

 time practically forgotten, or overlooked, as the case may 

 he, it is only fair to the author thereof to resuscitate it, if 

 found to he stable and of value. On the other hand, if 

 established under a misconception, and found to be of no 

 value, it were better relegated to the limbo of synonymy, or 

 the society of abolished names. 



There are several such names in the early annals of 

 Australian Palaeontology, and in the present paper I purpose 

 dealing with the name Mylodon australis, Kretit, and the 

 objects it represents. 



23* 



