A Review of American Diodontidce. 305 



2. D. hystrix Gunther. " Frontal spines of medium size." 

 8. I), maculatus, var. 0, Gunther. 'I The front spines being sometimes 

 shorter than the eye." 



/. In specimens referred to 1). hystrix, var. holacanthus. 



1. D. holacanthus Linnaeus. " Aculeis longissimis teretiformibus in capite 



imprimis collo." 



2. I), spinosissimus Cuvier, (Les epines) " du dcssus de la tete, qui sont 



aussi longs que ceux des flancs. " 



3. I), novemmaculaius, etc. Cuvier. "Ceux du dos sont assez egaux" (6 



inches long). 



4. D. maculatus, var. a, Gunther. "Spines, especially those in front, long, 



much longer than eye." Var. y. " Frontal spines longer than eye." 

 Var. <5, "Frontal spines longer than eye." 

 g. In specimens examined. 



1. No. 3728. Frontal spines about half length of post-pectoral spines, about 



as long as eye (= hystrix). 



2. No. 3229. Frontal spines not half length of post-pectoral spines. 



3. No. 876. Frontal spines not half length of post-pectoral spines, shorter 



than e} T e (= hystrix). 



4. No. 1244. Frontal spines about two-thirds as long as post-pectoral spines, 



little longer than eye (= hystrix). 



5. No. 383. Frontal spines longer than post-pectoral spines, about twice 



as long as eye (= holacanthus). 



6. No. 141. Frontal spines about three-fourths post-pectoral spines, as long- 



as eye (= hystrix). 



7. No. 3727. Frontal spines a fourth longer than post-pectoral spines 



(== holacanthus). 



8. "Nasal spines one and one-fourth times in longest post-pectoral spine" 



(= holacanthus). 



9. "All the spines from snout to dorsal much shorter than those behind 



pectoral " (= hystrix). 



C. Pre-dorsal spines. 



h. In specimens referred to D. hystrix. 



1. D. punctatus Cuvier. "La troisieme racine - - - n'est guere que la con- 



tinuation du piquant principal " (not stated what part of body*. 



2. I), hystrix Gunther. Spines "of the posterior part of the back short 



and broad." 



3. D. maculatus Gunther. " Spines varying in length ; those on the 



posterior part of the back sometimes fixed by the projecting ante- 

 rior ridge of the spine." 



4. D. hystrix Klunzinger. Ich finde immer 3 Wurzeln, die mittlere Wurzel 



oder die Fortsetzung des Stachels nach vorn ist aber bei den vorderen 

 Stacheln Kurz bei den hinteren wird sie langer und dann oft so 

 lang oder langer als der Stachel selbst. " 



