28 



MEMOIRS OF THE CARNEGIE MUSEUM 



127. Sternarchus oxyrhynchus Miiller & Tros- 



chel, p. 640. 



128. Synbranchus marmoratus Bloch, p. 640. 



129. Chelichthys punctatus Miiller & Troschel, p. 



641. 



130. Chelichthys psittacus Miiller & Troschel, p. 



641. 



131. Chelichthiji asellus Miiller & Troschel, p. 



641. 



132. Syngnathus pelagicus Linnaeus, p. 641. 



133. Carcharias (Prionodon) henlei Valencien- 



nes, p. 641. 



134. Carcharias (Prionodon) oxyrhynchus Miil- 



ler & Henle, p. 642. 



135. Sphyrna tudes Miiller & Henle, p. 642. 



136. Pristis pectinatus Latham, p. 642. 



137. Tamiura motoro Miiller & Henle, p. 642. 



138. Trygon garapa Schomburgk, p. 642. 



139. Trygon strongyloplerus Schomburgk, p. 642, 



140 Hypostomus plecostomus Valenciennes, p. 

 643. 



141. Hypostoynus 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 Miiller & 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 (Miiller & Troschel). 



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

 gon hystrix (Miiller & Troschel). 

 Rupununi, Takutu, and Rio Branco. 8-10 in 

 = Paratrygon orbicularis 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 

 (Miiller & Troschel). 



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

 brevifilis Cuvier & Valenciennes. 



= Myletes pacu Schomburgk. 



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

 chilodus rubrotomiatus Schomburgk. 



Rupununi, Takatu, and Rewa. = Potamotrygon 

 hystrix (Miiller & Troschel). 



