1869.] 289 [Shaler 



Length of carapax in a male, excluding the teeth of the front, 9.3 

 inillim.; breadth, 11.2 millim.; ratio of length to breadth, 1:1.20; 

 length, including spines of the front, 10.0 millim. Another male 

 gives, length of carapax, 7.3 millim; breadth, 8.5 millim.; ratio, 

 1:1.16; length including spines, 7.8; length of meros in larger cheli- 

 ped, 6.4; length of hand, 10.4; breadth of hand, 4.3; length of meros 

 in smaller cheliped, 5.8; length of hand, 9.4; breadth of hand, 3.3. 

 Length of carapax in a female, 8.0 millim. ; breadth, 9.6 millim.; ra- 

 tio, 1:1.20; length including spines, 8.6 millim. 



In young specimens the sides of the carapax are less convex than 

 in adults. 



Pacheca, one of the Pearl Islands, Bay of Panama, six to eight 

 fathoms among pearl oysters ; F. H. Bradley. 



Q. coronata Dana, the only other described species of the genus, 

 was from the Sooloo Sea, or Balabac Straits. 



