304 A* Review of American Diodantidce. 



4. 1). hystrix Swain & Smith. "Shorter and stronger spines in front of 

 dorsal, becoming longer again on tail. Length 244 inches." 



c. In specimens referred to D. hysirix var. holacanthus 



1. D. novemmaculatus. sexmaculatus. quadrimaculalus, mulUmaculahts, Cuvier. 



" La queue n'en a que deux (epines) en dessus." 



2. D. spinosissimus Glinther. " Upper part of the tail with a pair of spines 



besides those on the sides." 



3. I), maculatus Giinther. " Upper part of tail with a pair of spines besides 



those on the sides." 



d. In specimens examined by me. 



1. No. 3728, Mus. Ind. Univ.. from Saint Thomas ; 20 inches long, with 



16 spines on tail ; two and a half pairs of spines at base of tail ; no 

 spines on sides ; a series around root of tail ; procumbent spines 

 irregularly placed on upper side (= Hysirix). 



2. No. 3728, Mus. Ind. Univ., from Havana ; 21 inches long, with 15 



spines on tail ; 3 pairs form 2 ridges on the sides above. 2 pairs 

 similarly placed below, others about the root of tail (= hyslrix . 



3. No. 876, Mus. Ind. Univ., from Key West . ; 19 inches long, with 15 



spines on tail ; 5 on lower side ; 4 forming a ridge on one side on 

 top ; 3 with a fourth subdermal spine on opposite side ; none on 

 sides ; the others at the root of the tail >= hysirix). 



4. No. 1244. Mus. Ind. Univ., from Lower California near San Diego ; 11 



inches long with 12 spines on tail, all of them more or less con- 

 cealed under skin ; 2 pairs on lower side, 3 pairs on upper side ; 

 none on sides ; others at root of tail (= hystrix). 



5. No. 383, Mus. Ind. Univ., from Havana ; 7 inches long, wit^i 4 spines 



on tail ; a pair on lower side, a pair on upper (= holacanthus). 



6. No. 141, Mus. Ind. Univ., from Havana ; 5 inches long, with 5 spines 



on tail ; a pair on upper side, others at the root of tail (= hystrix). 



7. No. 3727, Mus. Dr. Jordan, from Havana ; 5^ inches long, with 2 



spines on the tail, one on each side above (= holacanthus). 



8. Specimen from La Paz*f at San Diego ; " 8| inches long. One spine 



on either side at the base. of caudal peduncle at the middle of the 

 side" (= holacanthus). 



9. Specimen from La Paz* at San Diego ; " 11 inches long. 3 spines along- 



upper edge of caudal peduncle and one at the lower edge" (=%.*- 

 trix). 



B. Frontal spines. 



e. In specimens referred to D. hysirix. 



1. D. punctatus Cuvier. " Ceux (epines) de la t£te en general sont moins 

 longs que ceux du dos et surtout que ceux des flancs." 



* Examined at my request by Miss Rosa Smith. 



t This is the specimen mentioned by Jordan & Gilbert. Proc. U. S. Nat. Mus., 1880. 453; 

 1881, 70, as from near San Diego. 



