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struck a subterranean rivulet and with the water from the same were 

 brougth up in the daylight several colorless and blind crayfishes. I 

 obtained two of them {çf) and have now compared them with the 

 description of other blind Cambari from the United States. Heretofore 

 two good species of that kind are known , Cambarus pellucidus Tell- 

 kampf and Cambarus hamulatus Cope and Packard. If we now compare 

 my new specimens from Florida with these, we will find a great 

 difference. Cambarus hamulatus is at once excluded as it belongs to 

 another group of species (according to Faxon) with the third segment 

 ofonly the third pair of legs hooked in the male and the first pair of ab- 

 dominal appendages of the male thick, terminated by two recurved 

 teeth etc. i. But there are still more differences , for instance rostrum 

 has strong, well developed lateral spines and there is a large spine on 

 each side just behind the cervical groove etc. but we need no more 

 characters here. It was not to be suspected either that a form from 

 the Nickasack cave in Tennessee even should be found in Florida. 

 My Florida species is then more related to Cambarus pellucidus. It 

 belongs in fact to the same group of species with the third segment of 

 third and fourth pair of legs hooked, but there is a great difference 

 here too. In the Florida form the rostrum is much shorter, broader 

 and more concave even than in the variety of C. pellucidus , which 

 Cope described under the name Oreonectes inermis'^ from the Wyan- 

 dotte Cave, Indiana. The apical point of the rostrum is short and blunt, 

 on the sides are only slight angles nearer the tip , no spines as in C. 

 pellucidus. The antennal lamellae are much broader and their spine 

 is very small. On the carapax there are no spines at all of any kind 

 (as in C. pellucidus even the form inermis) but only the areola and 

 rostrum are smooth. As well the sides of the head as the branchial 

 region are covered with granules or small tubercles and in this respect 

 different from C. pellucidus too. Terminal segment of telson shorter 

 and broader and less rounded. Opposed margins of fingers straight, 

 unidentate. Chelae subcylindrical granulated. Of course there are 

 other characters too, but as I hope soon to be able to publish an il- 

 lustrated paper upon this subject with full description , I think this 

 already can be enough to show that the mentioned blind crayfish from 

 Florida is a new and well distinguished species and the third blind 

 Cambarus of the United States. It is very interesting to have a species 

 of this kind in Florida and it could nearly a priori be foreseen that it 

 could not be identic with any of the northern forms from Indiana, 



1 Faxon, Hevision of the Astacidae. Mem. Mus. Comp. Zool., Harv. Coll. 

 Cambridge, Mass. J 885. 



2 Amer. Naturalist. 1872. 



