50 H. W00DWAED OK NEW KIMMEEIDGE-CLAT MACEUEA. 



The abdominal segments are 45 millims. in length and about 10 mil- 

 lims in depth (their epimeral borders are falcate) ; they are about 

 6 millims. in length each, and the caudal segment about 9 millims. 



The smaller feet are not very clearly seen ; but they measure 

 about 25 millims. in length. 



I believe the two fore limbs (PL YI. fig. 4) from the Sub-Wealden 

 boring, though imperfect, may be referred to the same species, M. 

 Peytoni ; and in examining one of the specimens I was delighted to 

 observe that it was associated (like that from Boulogne) with Lingula 

 ovalis, Sow. 



In size this species is intermediate between Mecochirus socialis, 

 Meyer, sp., and M. Pearcei, M'Coy, being about 130 millims., the 

 former being 60 millims. in total length (or less than half the size 

 of M. Peytoni), the latter being 175 millims. long, and robust in 

 proportion. 



EXPLANATION OF PLATE VI. 



Fig. 1. A nearly entire specimen of Callianassa isochela, sp. nov. 



2. Callianassa isochela, sp. nor. Another specimen, showing the caudal 



series very well preserved. (Both figures twice nat. size.) From the 

 Kimmeridge Clay of the Sub-Wealden boring, near Battle, Sussex. 



3. Mecochirus Peytoni, sp. nov. From the Kimmeridge Clay, Boulogne- 



sur-mer, associated with Lingula ovalis in the cliff-section ; nat. size. 



4. Hands of M. Peyton i. From the Kimmeridge Clay, Sub-Wealden boring, 



near Battle, Sussex ; nat. size. 



