Zoological Society. 147 



paid much attention to by our early voyagers and later naturalists. 

 The present bird differs from all the other species in the extreme 

 caution with which it avoids rather than approaches the neighbour- 

 hood of vessels at sea. It is rather abundant in Bass's Straits and 

 in all the seas off Ya.n Dieraen's Land. 



From its shyness, I propose to name this species 



DioMEDEA CAUTA. Dioni. vcrtice albo ; faciei colore e rnargaritd 

 cinereo ; dorso, alis cauddquc cinereo-fuscis ; rostro pallidevinaceo- 

 cinereo ; culmine, ad basin prcesertim, Jiavo. 



Crown of the head, back of the neck, throat, all the under surface, 

 rump and upper tail-coverts pure white ; lores and line over the eye 

 grayish black, gradually passing into the delicate pearl-gray which 

 extends over the face ; back, wings and tail grayish brown ; irides 

 dark vinous orange ; bill light vinous gray, or bluish horn-colour, 

 except on the culmen, where it is more yellow, particularly at the 

 base ; the upper mandible surrounded at the base by a narrow belt of 

 black, which also extends on each side the culmen to the nostrils ; 

 base of the lower mandible surrounded by a belt of rich orange, 

 which extends to the corners of the mouth ; feet bluish white. 



Total length, 31 inches; bill, 4^ ; wing, 21^ ; tail, 9 ; tarsi, 3. 



Hab. Bass's Straits. 



The above are the dimensions of a female ; the male is considerably 

 larger. 



Nearly allied to, but larger than D. melanophrys. 



Thalassidroma Nereis. Thai, giitture pectoreque fuliginoso- 

 cinereis ; dorso, nropygio tectricibusque cauda cinereis ; abdomine, 

 lateribus et crisso a/bis. 

 Head, neck and chest sooty gray ; lower part of the wing-coverts, 

 back, rump and upper tail- coverts gray, each feather very slightly 

 margined with white ; wings grayish black ; tail gray, broadly tipped 

 with black ; under surface pure white ; irides, bill and feet black. 

 Total length, 6^ inches ; bill, -^j. ; wing, 5^ ; tail, 2^ ; tarsi, 1^. 

 Hab. Bass's Straits, on the south coast of Australia. 

 This beautiful fairy-like Storm Petrel is about the size of Thai. 

 Wilsoni, and is remarkable as differing from most of the members 

 of the group in having no white on the rump and in the pure white 

 of the under surface. 



Mr. Gould exhibited to the Meeting a new species of Hypsiprym- 

 nus, from Swan River, which he characterized under the name of 

 Hypsiprymnus Graii. Hyps, fusco-cinereiis ; corpore subtus aU 

 bescente ; caudd mediocri, fused, flavo lavatd, ad apicem albd; 

 pedibus pallide fiiscis ; auribus mediocribiis rotimdatis. 



unc. lin. 

 Longitudo ab ajjice rostri ad caudoe basin. ... 18 



Cauda; 11 6 



tarsi digitorumque (sine nnguihus). . 4 3 



■ ab apice rostii ad basin auris .... 2 4 



auris I 1 



L2 



