504 Count T. Salvador! on some 



during the voyage of the 'Magenta' on April 6th, 1866, 

 lat. 35° 01' S., long. 85° 00' E. On the same occasion 

 were killed two specimens of Thalassogeron chlororhynchus, 

 fully adult, still preserved in our Museum. The specimen, 

 which has now become T. carteri, was regislered as a young 

 bird of T. chlororhynchus, and Prof. Grigiioli, who collected 

 it, described the bill as uniformly black. 



The circumstance that the three specimens were killed on 

 the same day and in the same spot makes me rather un- 

 certain as regards the specific value of T. carteri. It 

 appears that Grodman has also entertained some doubt as to 

 whether T. carteri was not established on a young bird of 

 T. chlororhynchus. lie says : — *' It is possible that, like some 

 of the true Albatrosses, the members of the genus Thalasso- 

 geron do not assume their fully adult plumage for two or 

 three years, and that the bill remains black for some time 

 before it becomes parti-coloured. '' 



No less interesting is a Thalassogeron of the first group, 

 unfortunately represented in our Museum only by a head 

 and neck, from an unknown locality, but collected by 

 Dr. Cavalli during the expedition of H.I.M. S. ' Liguria.'' 

 (Plate XIX.) 



The specimen, fully adult, does not agree with any of the 

 species figured in the ' Monograph of the Petrels,^ and 

 cannot be identified with the help of the text of the work. 

 But I must remark that the key of the species of the genus 

 Thalassogeron in the Monograph is rather misleading. In 

 it the three species T. culminatas, T. chlororhynchus, and 

 T. eximius are divided as follows : — 



a' . Culuimicorn rounded posteriorly T. culminatus. 



T. chlororhynchus. 



b'. Culminicoru pointed posteriorly s 



T. eximius. 



While the latter character holds good for T. chloroi'hynchus 

 it fails as regards T. eximius. In fact Mr. Verrill's 

 description of the latter species (Tr. Connect. Ac. Sc. ix. 

 p. 440) is accompanied by a good figure of the bill (pi. viii. 



