The extremely long spine shown in the illustration by 

 Le Danois of P. tenuispinus behind the pectoral fin base 

 is hinted at in the specimen in counterpart, but it is not 

 as definite as shown, and could represent either a large 

 spine or the postcleithrum. Most of the spines that are 

 apparent seem to have been relatively short and without 

 massive three-rooted bases, perhaps having been mostly 

 erectile and like those of the Recent Diodon except 

 shorter. The spines just behind the pectoral fin base 

 seem to have been somewhat longer than the others. The 

 placement of the branchiostegals is clear, but the first, 

 presumedly platelike, branchiostegal is not evident. 



In the specimen in counterpart there seems to have 

 been 11 caudal fin rays, one more than in any Recent 

 species, although some of the rays are displaced and the 

 count is not certain. In two of the three specimens there 





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