34 



PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



type iu a j^iveii direction, J would provisioually propose that they be 

 desifjnated as variety hrevicaudata. 



The specimens from the Saint John's River, Florida, are extremely 

 variable in every respect. Certain individuals show a tendency to 

 elongation of the head and fins, and also a slenderness of the posterior 

 part of the body, and nearly all the individuals from that region are more 

 lightly and gracefully shaped. They all have a tendency to a yellow 

 coloration, especially upon the caudal lobes. I have not felt justified, 

 hovrever, in calling it a variety. 



I have not had an opportunity to study the Maine schools, but am 

 inclined to believe that their differences are very perceptible. 



TahJe of Measurements. 



CunxKl miiiibiv of specimen. 

 Locality 



Extreme kngtb ' 



Body : 



Greatest heigbt 



Lea«t heiu'lit of tail 



Length of caudal jxiduuclo 



Head : 



Greatest length 



Distance from snout to nape 



Greatest width 



Length of suout from perp. from centre of orbit. 



Length of operculum , 



Length of maxillary 



Lengtii of mandible 



instance from snout to centre of orbit 



Dorsal : 



Distance from snout 



Length of base 



Origin of pectoral to origin of dorsal 



End of dorsal to end of anal 



Lengtii of longest ray 



Length of last ray . Z. , 



Anal : 



Distance from suout 



Length of base , 



Origin of anal to origin of doisal 



Length of longest ray 



Length of last ray 



Caudal : 



Length of middle rays 



Length of external ray.s, superior 



interior 



Pec tor il : 



Distance from snout 



Distance of tip from suout 



Length , 



Length of longest axillary appendage 



Ventral: 



Distance from snout 



Length 



Origin of ^-entral to end of dorsal 



Dorsal rays , 



Acal rays 



10,405 = 709 I 10,405 = 0rig. 

 C. A. S. I No. 247. 



"Wood'-s Holl, 

 Mass. 



Millim. lODths. Millim. lOOths 



Wood's lloll, 

 Mass. 



Very fat. 



251 I . . . . 



38i 



32 



20 

 15 

 10 

 9 

 14i 

 ITS 



lOi 



54 

 19 

 41 



12i 

 6' 



73 

 14 

 39 

 Oh 



23 

 26J 



30 



19 

 11 



53 



38 



Plump. 

 243 I.... 



31 



20i 



10 

 9 

 14i 

 171 

 lOJ 



51 



171 



33| 



24 



11 



14J 



33 



51 



4j 



4J 

 20A 

 23' 



32 



48 



n.'> 



20,0(36 a. 



Wood's Holl, 

 Mass. 



Millim. 



lOOths. 



M 

 17 



101- 



49 



17.^ 



35i 



2.5 



12.V 



]5i 

 30 

 0? 



H 



