24 



ft. in. lin. 



Length from tip of muzzle to angle of mouth O 7 9 



Length of dorsal fin (along the anterior margin). ... 1 05 



Helght of ditto O 6 4 



Length of pectoral, (along anterior margin) 1 2 8 



■Wi(lth of taa 1 4 5 



Girth of body before dorsal fin 3 O 6 



Girth of body before pectoral fin 2 S 2 



Girth of body before tail fin O 7 8 



Girth of head over the eyes 2 O O 



Ęabitat, Coast of Patagonia, lat. 42° 30'. (April). 



" This species, which I have taken the liberty of naming after 

 Captain Fitzroy, the Commander of the Beagle, approaches, in some 

 respects, to the Delphinus superciliosus of the ' Voyage de la Co- 

 ąuille/ but that aniraal does not possess the obliąue dark-gray bands 

 on the sides of the body; it like\vise \vants the gray mark \vhichex- 

 tends from the angle of the mouth to the pectoral fins. In the figure, 

 the under lip of the Delph. superciliosus is represented as almost white, 

 Avhereas in the present species it is black : judging from tlie figures, 

 there is likewise considerable difference in the form. The figure 

 ■which illustrates this description agrees \vith the dimcnsions, which 

 were carefully taken by Mr. Dar\vin immediately after the animal 

 ■vvas captured, and hence is con'ect." 



Mr. Gould exhibited two species of the genus Ptilotis, \vhich lie 

 characterized as Ptil. ornata, and Ptil. flavigula. 



Ptilotis ornata. Ptil. vertice, alarum marginihus externis, nec 

 non cattdcB olivaceis ; dorso uropygioąue brunneis ; gula, genis- 

 que olivaceo-fuscis ; pectore corporeque subtiis ciiierescentibus, 

 singulis plumis nota latd brunned in medio ornatis ; crisso 

 pallidė badio plumis fusco strialis, jJenicilld nitidė Jlavd utrum- 

 que colli latus ornante ; notd longituditiali sub oculos olivaceu; 

 primariis rectricibusgue catida: fuscis, his ad apicem externum 

 albis ; rastro nigrescente ; pedibus brunneis. 



Long. tot. 6|^ unc; rostri, į; al<e, 3^; caudce, 3^; tarsi, į. 



Hab. Swan River, Australia. 



Ptilotis flavigula. Ptil. capite, nuchd, genis, corporegue infe- 

 riore nigro-griseis, hoc colore apud abdomen crissumgue olivaceo 

 tincto ; j)lumis auricularibus argenteo-cinereis et post kas gutld 

 Jlavd; gula Jlavd; alis, dorso, cauddqtie, Jlavescetiti-olivaceis ; 

 femoribus olivaceis ; rostro pedibusque nigrescentibus. 



Long. tot. 8 unc; rostri, 1; ala, 4į; caudce, A\; tarsi, 1. 



Hab. Van Diemen's Land and New South Wales. 



