E. §. Morse—Brachiopoda a division of Annelida. 101 
been eliminated from time to time, and referred to their proper 
branches. After long and careful study Mr. Morse was pre- 
pared. . state that the Brachiopods were true Articulates, and not 
Mollusks, and that their proper place was among the worms, 
foentig a group near the tubicolous Annelids. 
He stated that for the past year he had been deeply engaged 
in the study of the Brachiopoda, and more particularly their 
early Senaty Beside material from the coast of New England, 
he had had, through the kindness of Prof. A. E. Verrill, a large 
lot of Discina from Callao, Peru, belonging to the Yale Col- 
lege Museum. From these he had s tudied their early s.ages, 
but as he had in preparation a memoir upon the subject, he 
would now confine himself to the considerations that follow. 
He first spoke of the structure and composition of the Brach- 
iopod shell, and pointed out the relations between the ccecal 
prolongations of the mantle in Terebratula and a similar struc- 
ture in the test of Crustacea. He had also noticed a marked re- 
semblance between the polygonal cells in the shell of a youn 
ma, and a similar feature in certain lower Crustaceans. 
The scale-like structure of the test of Idotaea, resembled the 
scale-like structure of Lingula. The skin of Nereis had similar 
punctures or dots, as seen in Zerebratula and also in the pedun- 
cle of Lvngula. He had submitted the shell of Discina to 
chemical ‘cots and believed it to be chitinous. Gratiolet had 
already given the chemical analysis of Lingula anatina an 
found forty two per cent of gee eeu of lime, and only s 
per cent of carbonate of lime. The position of the valves a 
all Brachiopoda were dorsal and ventral, and this was a stro 
articulate character to be compared to the dorsal and ventral 
plates of the Articulates. The horny setz that fringe the man- 
tle of Brachiopods was a ~~, entirely absent in the Mol- 
lusea, and peculiar to the w 
The —— of worms differ 4 from those of other articulate 
in having sheaths containing muscular fiber, while in 
the epidermal layer In oped orn mee or bristles were se- 
then 
called attention to the resemblance been the lo: ihophore of 
the Brachiopods and a similar structure in the tubicolous worms 
In Sabella the cephalic collar was split laterally, and a portion 
of it reflected. Let this collar be developed so as to cover the 
fringed arms, and a representation of the mantle of Brachiopoda 
would be attained. The thin and sation visceral walls 
suggest similar parts in the worms. The circulating system he 
ad not sufficiently studied, though Dr. “Gritioler had stated 
