194 Bulletin, Vanderbilt Marine Museum, Vol. II 



diameter of the cornea is from two to two and one-half times that of 

 the stalk. 



Synonymy. — Euphylax dovii Stimpson, Ann. Lye. Nat. Hist., vol. 7, 

 p. 93, pi. 3, fig. 5, I860.— A. Milne Edwards, Miss Sci. Mex., p. 

 204, pi. 38, fig. 2, 1880.— Rathbun, Proc. U. S. Nat. Mus., vol. 

 38, p. 578, 1910. 



Family; GONEPLACIDAE. 

 Subfamily : Goneplacinae. 

 Genus: GONEPLAX Leach. 

 Goneplax tridentata (A. Milne Edwards). 



Plate 66, fig. A. 



Diagnostic characters : Carapace box-like, frontal border straight, 

 anterolateral margin with three sharp anterolateral teeth, including 

 the postorbital. 



Type: The type was taken by the ''Blake" at station 287, Barba- 

 dos, in 7I/2 to 50 fms., and is deposited in the National Museum d'His- 

 toire Naturelle, Paris. 



Distribution : Hitherto known only from the type locality, Barba- 

 dos, 7% to 50 fms., and one specimen from Glover Reef, Caribbean 

 Sea, 484 fms. The " Ara" specimen adds a third record for this spe- 

 cies, off Alligator Reef, Florida, 150 fms., thus substantially extending 

 the northern range of this rare species. 



Material examined: One large specimen dredged off Alligator 

 Reef, Florida, 150 fms., March 30, 1926, by the "Ara," William K. 

 Vanderbilt, commanding. 



Technical description : Carapace about one-sixth wider than long, 

 interorbital space about one-third of width, with the frontal lateral 

 margin straight in a dorsal view, but slightly sinuate and with a 

 minute inferior, median dorsal tooth when viewed from the front; 

 frontal border with the terminal angles acute, slightly deflexed and 

 separated from the inner superior orbital angles by an acute incision. 

 The dorsal orbital margin is elliptical, nearly as long as the frontal 

 border and sinuate. The anterolateral borders are produced into 

 three strong, forward-directed, subequally spaced teeth, of which the 

 first or postorbital is minutely broader basally and more forward 



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