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 8-jointed, but the first pair 
has the outer branch very long and angularly flexed, 
the last jomt 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 Carillus 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 Alteutha, 
and the general form of the animal to A. bopyroides, 
Claus. Though there must, for the present, be some 
doubt as tothe 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- 
teutha and Carillus. The name Peltidiwm 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 Porcel- 
