630 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



All specimens seen were non-embryos and ranged from ca. 310 to ca. 

 666 mm. 



Distribution. — Australia from Derby, Western Australia, north- 

 ward around to south Queensland. The single specimen from Western 

 Australia had 73 precaudal vertebrae while those (9 specimens) from 

 the Northern Territory and Queensland had 77-80. This may 

 indicate some differentiation in the populations. 



Relationships. — See under R. oligolinx (p. 626). 



NoMENCLATURAL DISCUSSION. — Wliitlcy (1940) gave a figure of a 

 specimen that he mistakenly beheved to be Ogilby's holotype of 

 Physodon taylori. Ogilby (1916) reported his specimen as 657 mm. 

 (Queensland Museum catalog number 112/738) and Wliitley illus- 

 trated a specimen (14539, according to Queensland Museum records) 

 approximately 22 inches long, about 4 inches shorter than the holotype. 

 I failed to find the holotype in a search of the Queensland Museum 

 collections, and a note in the museum files indicated that previous 

 efforts to find it had also met with no success. 



The nature of the teeth and labial furrows and the position of the 

 anal fin in relation to the second dorsal fin, however, make it certain 

 that Ogilby had a species closely related to R. oligolinx. I, therefore, 

 use his name for the only species of such relationship and for which 

 there is no other name available. 



Material. — Australia: Western Australia: Derby, AMS IB1551 

 (1: ca. 390 mm.); Northern Territory: 3.5 miles off Peron Island, QMB 

 17806 (1: ca. 600); Little Lagoon, Groote Eylandt, Gulf of Carpen- 

 taria, USNM 174075 (1: 555); Pellew Islands, Gulf of Carpentaria, 

 AMS IA1611 (1: 542), QMB 13958 (1: 407); Queensland: Cairns, 

 Cooktown Station, MCZ 36653 (1: 598); Townsville, QMB 14539 

 (1: 522); Salamander Rocks, QMB 16886 (1: 666); Deception Bay, 

 DHMB 45 (1: 323); Burnett River, AMS IB7028 (1: ca. 310). 



