306 ZOOLOGY. 
is formed at this stage a large cavity which divides into two partis : 
the upper part, uniting the hollow tentacles at their base, forms the 
so-called circular canal, while below it, and connecting with it, we 
have a large cavity forming the perivisceral cavity, a mode of 
development of the circular ring and of the perivisceral cavity 
totally unlike that observed in Ophiurans, Starfishes, Echini = 
Holothurians. | 
Metschnikoff compares the mode of development of the ti 
and lower cavity to analogous processes in the embryonic growth 
of Alcyonella and other Bryozoa; he traces a striking similarity 
in the structure and position of the digestive organs and ten 
with similar organs of Bryozoa. However that may be, he 
shown conclusively that the larva of Comatula has apparently 
nothing in common with other Echinoderm larvae; but we 
wait for his figures on this intricate subject before we can decide 
if the position he assigns to Crinoids is true to nature—* 
AGassiz, in Amer. Jour. Sci. 
Birds New to Massacuuserrs Fauna.—I send you the 
ing memoranda, of six species of birds, new to the fauna 
state taken within its limits by myself and friends, with 
request that you will publish them in the NATURALIST :— 
Hudsonian Titmouse (Parus Hudsonicus). On 
1870, I took an adult female at Concord, in compan with 
Golden-crested Kinglets (Regulus satrapa). m 
ae! 
European Ruff (Philomachus pugnax). Had a fines 
me in the flesh from Newburyport marshes, May ih 
Upon dissection it proved a female, with the ovaries | 
developed that I judged it would have laid within two oF 
weeks. This, Prof. Baird informs me, is the sixth that 
taken in America. i 
Baird’s Sandpiper (Actodromus Bairdii). AS ee 
Long Island in Boston harbor, Aug. 27th, 1870, by. the fil 
Henshaw of Grantville, Massachusetts. This is I beue 
note of the occurrence of this bird on the Atlantic coasts 
Havel’s Tern (Thallaseus Haveli). A single SP 1870. 
on Ipswich beach by Mr. C. J. Maynard, September m 
Marsh Tern (Geochelidon Anglica). taken ° 
beach, September, 1871, by Mr. C. J. Maynard. il 
Barrow’s Goldeneye (Bucephala ae Lom 
