188 



PICTURESQUE SKETCHES 



water, that they are perfectly manageable in that 

 element, and when used as spades in the soft wet 

 sand, the animal moves with great rapidity, and in 

 any direction by their aid. Most of the animals of 

 this group inhabit the shore, or moderate depths at 

 no great distance from shore. 



The oolitic Crustacea include an extensive series 

 not very different from the lobster, the prawns (see 

 fig. 67), and the king-crabs of the existing seas. Most 



Fig. 67 



LONG-CLAWED OOLITIC SHRIMP. 

 (Megackirus.) 



of these are found in one particular spot in the 

 north of Bavaria, in a peculiar fine-grained absorbent 

 stone, much used for lithographic purposes. This 

 stone is calcareous ; it has a peculiar aspect and 

 a remarkably delicate texture, and has, doubtless, 

 Fig. 68 Fig. 6.9 been deposited from 



an impalpable mud. 

 The numerous 



X^^SBr**^ fossils it contains, 

 Qli*Liuhh \ and they are even 

 more remarkable for 

 their perfect condi- 



INSBCTS OF THE SECONDARY EPOCH. ^ ^ ^^ num _ 



ber, include but few remains of ordinary mollusca, 



