ICHTHYOLOGY/ OF THE LESSKK ANTILLES. 



455 



Two tail vertebra, 



One tail vertebra, 



No tail vertebree, 



* * Parietals separated by supraoooipital. 



Two tail vertebree, 



One tail vertebra, 



8 Tail diphycercal, pterotio normal, basis oranii simple. 

 Basal branohihyals and superior pharyngeals each three ; 

 The same bones each two ; 



( ITjiodaniidai. 

 < AlbuUdm. 

 (. Elopidii. 

 i . I ulopidm. 

 • Coregonidce. 

 f Lutodiridce. 

 ( Siti/rii/ti . 

 \ Gonorhynchidm. 



( Alepoce^ 

 \ Salmonidce. 



f ChirocentridcB. 



Osteoglossidce. 



( Ileterotidai. 

 \ Oalaxiidm. 



Haplomi. No praoooracoid arch. Parietal bones separated by the supraoooipital. A sympleotic; opercular 

 hones present ; anterior vertebras unaltered. Pharyngeal hones distinct, the superior directed forwards, three or 

 four in number. No interolavioles. 



1 Basis oranii double ; maxillary entering mouth border. JSsoeidce. 



2 Basis oranii simple; maxillary bounding mouth. Umbridm. 



3 Basis oranii simple ; mouth bounded by promaxillary only ; third upper pharyngeal enlarged. ( dj/pniiodontidm. 



( J/i/pswMo'. 



Glanhnoheli. Parietal bones extensively in contact, distinct ; pterotic normal ; a symplcctic. Opercular hones 

 complete ; mouth bounded by promaxillary chielly: six or seven basilar pectoral rays. No prascoracoid or interolav- 

 ioles. Anterior vertebree united, modified, and with ossicula auditus. Superior pharyngeal bones subequal, con- 

 tinuous. 



One family, the Gymnotidm, which approaches the eel-like Siluridce, the Sternopygidm, and the Monopterus of 

 Java, so as to be in a measure intermediate between them. The characters are, no parietal fontanello ; four superior 

 pharyngeals, three basal branohihyals ; brain prolonged between orbits. The structure of the fins, and the rudimental 

 maxillary bones distinguish this family from the Sternopygidee, with which they have boon heretofore associated. 

 In the first they are like the eels, in the latter the siluroids. 



Iohthtoobphali. Epiclaviole suspended to posttemporal and to cranium; mouth bounded abovo by premaxil- 

 laries, which are in contact on the median line, and in contact with a distinct maxillary by the posterior margin; no 

 Interneural spines, pectoral lius nor symplcctic bone ; two basal branchihyal pairs. Vertebree unaltered. Two pairs 

 basihyals. ■ 



One family, the Monopteridm. Two (8d and 4th) superior pharyngeal bones on each side. The general form is 

 eel-like. 



Holostomi. Epiclavicle suspended to fourth vertebra, posttemporal wanting. Parietals in contact. Mouth 

 bounded by the premaxillaries which are in contact medially and bounded behind by maxillary. Sympleotio present ; 

 vertebra 1 unaltered ; no pectoral fin. Third superior pharyngeal not smaller than fourth. 



One family, the SymbranoMdm, with the genera, Amphipnous and Symh ■rancJms. 



Enchelycephali. Parietals In contact; lower pair of basihyals wanting. Scapular arch suspended to an 

 anterior vertebra, no posttemporal, no sympleotio, maxillary bone absent or connate with promaxillary which forms 

 border of mouth. Premaxillaries separated on the median line by the ethmoid. Superior branohihyals and inferior 

 and superior pharyngeals well developed ; the latter of three bones. Of these the fourth is largest and supports the 

 third, which with the second is directed forwards. 



1. Palatopterygoid arch oomplete ; pectoral fins. Congridm. 



2. Pectoral fins ; palatopterygoid arch represented by pterygoid ; premaxillaries more widely separated. 



Anghiillidm. 



