28 



MEMOIRS OF THE CARNEGIE MUSEUM 



127. Sternarchus oxyrhynchus Muller & Tros- 



chel, p. 640. 



128. Synbranchus marmoratus Bloch, p. 640. 



129. Chelichthys punctatus Muller & Troschel, p. 



641. 



130. Chelichthys psittacus Muller & Troschel, p. 



641. 



131. Chelichthys asellus Muller & Troschel, p. 



641. 



132. Syngnathus pelagicus Linnaeus, p. 641. 



133. Carcharias (Prionodon) henlei Valencien- 



nes, p. 641. 



134. Carcharias (Prionodon) oxyrhynchus Mul- 



ler & Henle, p. 642. 



135. Sphyrna hides Muller & Henle, p. 642. 



136. Pristis pectinatus Latham, p. 642. 



137. Tazniura motoro Muller & Henle, p. 642. 



138. Trygon garapa Schomburgk, p. 642. 



139. Trygon strongylopterus Schomburgk, p. 642. 



140 Hypostomus plecostomus Valenciennes, p. 

 643. 



141. Hypostomus squalitus Schomburgk, p. 642. 



142. Phractocephalus hemiliopterus Agassiz, p. 



643. 



143. Pimelodus arekaima Schomburgk, p. 643. 



144. Pimelodus insignis Jardine, p. 643. 



145. Hypophthalmus dawalla Schomburgk, p. 



643. 



146. Myletes pacu Schomburgk, p. 644. 



147. Prochilodus rubro-tceniatus Schomburgk, 



p. 644. 



148. Trygon histrix Schomburgk, p. 644. 



Lower Essequibo. 16-18 in. = Sternarchorhyn- 

 chus oxyrhynchus Muller & Troschel. 



Drains of the plantations. 2-3 ft. = Synbran- 

 chus marmoratus Bloch. 



Sand banks of the coast. 12-15 in. 



Mouths of the Waini and Barima and sand-banks 

 of the coast. 4-6 in. = Colomesus psittacus 

 (Bloch & Schneider). 



Fresh water, Barima. 4 in. = Colomesus psit- 

 tacus (Bloch & Schneider). 



Salt water near the coast. 10-12 in. 



Found on whole coast, especially near the mouth 

 of the Demerara. 4-6 ft. 



Coast, especially near the mouth of the Demerara. 

 6-8 ft. 



Whole coast, especially mouth of Demerara. 4-6 

 ft. 



Coast. 4-6 ft. 



Mouth of the Zuruma. 6-8 in. = Potamotrygon 

 hystrix (Muller & Troschel). 



Takutu and Rio Branco. 8-10 in. = Potamotry- 

 gon hystrix (Muller & Troschel). 

 Rupununi, Takutu, and Rio Branco. S-10 in 

 = Paratrygon orbicidaris Bloch & Schneider. 



Takutu and Rio Branco. 8 in. = Plecostomus. 

 plecostomus (Linnaeus). 



Essequibo, Rio Branco, and Takutu. = Plecos- 

 tomus emarginatus Cuvier & Valenciennes. 



Generally distributed in British Guiana. 2 ft. 11 

 in. to 4 ft. 2 in. = Phractocephalus hemiliop- 

 terus Agassiz. 



All rivers of the savannah. 2-3 ft. = Rhamdia 

 arekaima Schomburgk. 



Takutu and Rio Branco. = Pimelodella cristata 

 (Muller & Troschel). 



Rivers of British Guiana. 2-3 ft. = Ageneiosus 

 brevifilis Cuvier & Valenciennes. 



= Myletes pacu Schomburgk. 



Essequibo and tributaries. 18-20 in. = Pro- 

 chilodus rubrotamiatus Schomburgk. 



Rupununi, Takatu, and Rewa. = Potamotrygon 

 hystrix (Muller & Troschel). 



