PELTIDIUM. 159 



digitate, clawed at the apex (not unlike those of Thales- 

 tris), second pair elongated, 3-jointed, terminating in a 

 strong clawed hand. All the swimming feet have both 

 branches elongated and 3-jointed, but the first pair 

 has the outer branch very long and angularly flexed, 

 the last joint very short, and terminating in two or 

 three prehensile claws. Fifth pair simple, stout, 2- 

 jointed, the second joint much elongated, and strongly 

 spinous on the outer margin and apex. 



Goodsir's figure of the first foot of Garillus oblongus 

 is so characteristic that there can be no doubt of the 

 identity of that species with some member of the 

 present genus, while his representation of the second 

 foot-jaw ("second thoracic leg") would lead me to 

 suppose that the species in view must have been Al- 

 teutha depressa, Baird. As regards Sterope interrupta 

 of the same author the figures and description of the 

 posterior pair of feet also point to the genus Alteuiha, 

 and the general form of the animal to A. bopyroides, 

 Glaus. Though there must, for the present, be some 

 doubt as to the species referred to by Philippi (Weig- 

 mann's Archiv.,' 1839), there can be none, I think, as 

 to the genus, which by the structure of the limbs and 

 mouth-organs, most of which are clearly figured by 

 Philippi, is distinctly shown to be identical with Al- 

 teuiha and Carillus. The name Peltidium being older 

 by six years than those of Baird and Goodsir, must 

 therefore be adopted as the generic appellation. 



Though, in general outline and in the depressed 

 form of the animal, these species exhibit an approach 

 to the previous group Zaus, Scutellidium, and Parcel- 



