368 CHAS. CHILTON. 



2. Description of Specimens. 

 Specimen 1, Pig. 1. (Block 237, larger impression.) 





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Fig 1. Phreatoicus wianamattensis, (No. 237a); X 5. 



This impression is about 18 mm. in length, but the head 

 and one or two anterior segments of the peraeon are want- 

 ing, and so also is the terminal portion of the pleon. There 

 are indications of five peraeopoda, some of them being 

 remarkably perfect, and enabling the separate joints to be 

 determined with considerable certainty. These apparently 

 represent peraeopoda 3, 4, 5, 6 and 7, that is to say, those 

 attached to the five posterior segments of the peraeon. Of 

 these, peraeopoda 3 and 4 are very distinct, and quite 

 similar. In each the basis is somewhat expanded; the 

 ischium moderately long; the merus broader, subtriangular 

 and produced at the antero-distal angle into a lobe extend- 

 ing fully half way along the carpus; the carpus appears to 

 be about as long as the propod, and of rather greater width; 

 the dactyl is about half as long as the propod and slightly 

 curved, being in both peraeopoda directed backwards. 

 Peraeopod 5 is about as long as either of the two preceding, 

 but evidently belongs to the posterior series of three, having 

 its dactyl facing forwards; the basal joint is about as broad 

 as that of peraeopod 4, and the other joints show a general 

 agreement, the merus, however, being not so much pro- 



