484 



PATAGONIAN EXPEDITIONS I ZOOLOGY. 



Order PLECTOGNATHI. 

 Family TETRAODONTID^. 



COLOMESUS Gill. 



Batrachops Holland. 



Type: Tetrodon psittacus Bloch & 

 Schneider. 



Range: Marine and fresh waters of 



tropical America. 



Ai. Colomesus psittacus (Bloch & Schnei- 

 der), J. & E., 1740. 



Cherlichthys asellus Miiller & Troschel. 



Habitat: West Indies; Guiana to 

 Maranon and Para. 



LAGOCEPHALUS Swainson. 

 Physogaster and Gastrophysus Miiller; 

 Promecocephalus Bibron ; Tetrodon 

 Gill. 



Type : Tetrodon pennanti Yarrell = Te- 

 trodon lagocephalus Linnaeus. 

 Habitat : Chiefly .tropical seas. 

 . Lagocephalus Iccvigatus (Linnaeus). 



Tetrodon curvus and mathematicus 

 Mitchill ; Holocanthus melanothus 

 Gronow; Tetrodon lineolatus Poey. 

 Habitat : Cape Cod to Brazil, entering 

 rivers; Para. 



SUMMARY. 



Number of Spe- 

 cies in the En- 

 Families, tire Area. 



Petromyzonidae 5 



Galeidae 2 



Rajidae 2 



Narcobatidae I 



Myleobatidae I 



Dasyatidae 9 



Lepidosirenidae I 



Lepisosteidae 2 



Aspredinidae 22 



Diplomystidae I 



Siluridae 300 



Hypophthalmidae 2 



Pygidiidae 66 



Callichthyidae 34 



Loricariidae 208 



Cyclopidae 23 



Catostomidae 5 



Cyprinidae 21 



Characidae 659 



Gymnotidae 31 



Electrophoridae i 



Synbranchidae I 



Anguillidae I 



Engraulidae 13 



Clupeidae 5 



Number of Spe- 

 cies in the Am- 

 azon Basin. 



5 



i 



10 



139 

 i 



28 

 16 

 81 

 15 



317 



22 

 I 

 I 



7 

 3 



Families. 



Dorosomidae 4 



Elopidae 2 



Osteoglossidae I 



Arapaimidae I 



Paeciliidae 160 



Galaxiidse 7 



Aplochitonidae 2 



Belonidae 8 



Mugilidae 1 1 



Atherinidae 33 



Polycentridse 3 



Centropomidae 8 



Serranidae 5 



Haemulidae 8 



Scisenidae 13 



Percidse I 



Cichlidae 187 



Carangidae I 



Gobiidae 27 



Batrachoididae 2 



Blenniidae I 



Pleuronectidae 2 



Soleidae 12 



Tetraodontidae . 2 



Number of Spe- Number of Spe- 

 cies in the En- cies in the Am- 

 tire Area. azon Basin. 



I 



I 



14 



4 



i 



Totals 1917 



55 

 8 



2 



4 



i 



748 



