72 



Nils Rosén 



They show a great variation in the relation of the plate behind the dorsal 

 fin to the carapax. In some specimens this plate is separated from the carapax, in 

 other it is united with it on one side, but separated on the other, and in some 

 specimens the plate is united with the carapax on both sides. There were two 

 plates behind the dorsal fin in a few specimens collected. 



Lactophrys tricornis, L. 

 Several specimens collected at Mastic Point. 



The dorsal caudal spine is present in some specimens, absent in others. The 

 two plates on the tail behind the carapax are not always present. 



Fam. Tetrodontidae. 



Spheroides spengleri (Bloch). 

 Current, Powells Point, Clarence Harbour and Hog Island [Exped. Geogr. Soc). 



Spheroides testudineus, L. 



Common at Mastic Point (Andros) in mangrove-bights, also found in the 

 braciiish ponds which are in connection with the sea. Green Turtle Cay (Edwards). 



Fam. Diodontidae. 



Diodon hystrix, L. 

 Three specimens obtained at Mastic Point, thrown on the beach. 



Diodon holacanthus, L. 

 Common at Hog Island. Clarence Harbour {Exped. Geogr. Soc). 



CMlomycterus geometricm, Bloch & Schneider. 

 One specimen at Mastic Point. 



A rather large tentacle above the eye. Hexagonal black reticulation. It seems 

 impossible to maintain the distinctness of the three species Ch. schoepfi, Walb., Ch. 

 spinosus (L.) and Ch. antillarum, Jord. & Rutter. 



(Printed July 27"', 19ll.) 



