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DISCOVERY REPORTS 



broad and thick anterior prongs, of which the outer is the shorter. He gives no measure- 

 ments of his specimens, nor does he indicate at what size the fusion of the tritors takes 

 place. The pectorals are said to extend beyond the middle of the bases of the pelvics. 

 In the species from Chile and Peru, identified by him as C. smythii, the tritors of the 

 palatine laminae are said to persist as separate, elongate, parallel bars, and the pectorals 

 not to reach the pelvics. Among the material collected by the ' Discovery ' Expedition, 

 all the smaller specimens (270-330 mm.) exhibit the elongate parallel tritors, and the 

 same condition is found in two larger examples (495 and 800 mm.). 1 In two other 



Fig. 12. Callorhynchus callorhynchus. Specimen from the coast of Uruguay, x \. 



Fig. 13. Dental laminae of C. callorhynchus. A, female, 330 mm.; B, female, 495 mm.; 

 C, female, 500 mm. ; D, male, 620 mm. x §. 



specimens (500 and 620 mm.) the tritors have the form described by Garman for 

 C. callorhynchus. I find the length of the pectoral fins very variable and quite unreliable 

 as a specific character. There is certainly no correlation between the length of these fins 

 and the form of the dental laminae in the specimens examined by me, and it would 

 appear that the two species callorhynchus and smythii cannot be maintained on the basis 

 of these characters. It is probable that the examination of an adequate series of 

 specimens would show that the nominal species capensis, from South Africa, and milii, 

 from Australia, Tasmania, and New Zealand, are nothing more than varieties of 

 C. callorhynchus. 



1 The same condition is to be seen in a specimen of 550 mm. from off the coast of Uruguay (Marini). 



