19 



The vertebral formula was as follows : 



Cervical 7 



Dorsal 15 



Lumbar 7 



Sacral 2 



Coccyeal 8 ? 



The ribs consisted on each side of 8 true and 7 false. 



Mr. Yarrell exhibited a recently preserved example of a new spe- 

 cies of Swan, closely allied in external appearance to the well-known 

 Domestic Swan, but having the legs, toes, and interdigital mem- 

 branes of a pale ash-grey colour, which in the Cygnus olor. 111., are 

 deep black. Mr. YarreU observed, that this species had been known 

 to him for some years past as an article of commerce among the 

 London dealers in birds, who receive it from the Baltic, and di- 

 stinguish it by the name of the Polish Swan. In several instances, 

 these swans had produced young in this country, and the cygnets 

 when hatched were pure white, like the parent birds, and did not 

 assume at any age the brown colour borne for the first two years 

 by the young of all the other known species of White Swans. 

 Mr. Yarrell considered that this peculiarity was sufficient to entitle 

 the bird to be ranked as a distinct species, and in reference to the 

 unchangeable colour of the plumage, proposed for it the name of 

 Cygnus immutabilis. 



During the late severe weather, flocks of this swan were seen 

 pursuing a southern course along the line of our north-east coast, 

 from Scotland to the mouth of the Thames, and several specimens 

 were obtained. The specimen exhibited belonged to the Rev. L. B. 

 Larking, of Ryarsh Vicarage, near Maidstone, for whom it had been 

 preserved. It was shot on the Medway, where one flock of thirty, 

 and several smaller flocks were seen. 



Mr. Waterhouse exhibited a new species of Squirrel from the So- 

 ciety's Museum, and characterized it as : 



SciUKUs suBLiNEATUs. Sc. supvci fusco-oUvaceus flttvescente lava- 

 tus ; lineis dorsalibus quatuor nigris tribus albescentibus, a hume- 

 ris ad uropygium excurrentibus : abdomine fiavescente : caudd ni- 

 gra flavoque annulatd. 



unc. lin. 

 Longitudo corporis ab apice rostri ad caudae basin. . 6 



ab apice rostri ad auris basin 1 2i 



cuudce (pilis inclusis) 5 



tarsi digitorum(\\ie 1 2^ 



auris 2- 



Habitat ? 



" This animal is less than the Palm Squirrel (Sciurus palmarum, 

 Auct.),but like that species has four dark and three pale lines on the 

 back : these lines, however, are very narrow, and occupy only the cen- 

 tral portion of the back ; they are not continued on to the shoulders, 

 neither do they extend over the haunches. The general colour is 



