18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



hence, if future investigations are attempted, the methods will be 

 used in the reverse order from that given above. 



Postscript. — Williams (1966) recently has described a new species, 

 Callinectes similis, from eastern America that had been confused 

 previously with C. ornatus and C. danae. Using the features listed in 

 table 1, we find that the species appears, from the description, to 

 resemble C. danae rather than C. ornatus in three features and to 

 resemble C. ornatus rather than C. danae in two. The new species 

 also differs from the other two in one listed feature, viz. 55. The exist- 

 ence of another species further increases the "cohesion" of the genus 

 and supports its claim for continued generic status. 



