. Morse.] 362 [March 19, 
est allusion to Prof. Steenstrup’s views on the subject, and until quite 
‘recently I had thonght that to myself belonged the entire credit of 
the views advanced in this paper, until I was made acquainted with 
the fact that twenty-five years ago Steenstrup had not only considered 
‘the Brachiopods as worms, but had placed them near the tubico- 
‘lous Annelids. Before presenting the views of this distinguished 
‘naturalist, it is proper to go back to the relations that many nat- 
-uralists, as Agassiz, Deshayes, Owen and others, believed to exist 
‘between Terebratula and Anomia. : 
In the light of our present knowledge of the subject, it seems as 
incomprehensible that such views were held, as that the Cirrepeds 
-were ever included with the Mollusca, and it is still more a matter 
of astonishment'that to this day there are a few naturalists who have 
a vague idea that Anomia forms a sort of connecting link between the 
Brachiopods and the Lamellibranchiates.? 
In the year 1853, Forbes? wrote as follows: “ Linnzeus included in 
his genus Anomia the species of Terebratula. Mislead by a false 
analogy, he considered these very different Mollusks to be organized 
on the same plan, and the perforation of one of the valves in each, to 
be of similar origin. ; 
“Lamarck, in like manner, fancied that in Anomia he saw a passage 
into Terebratula and the Brachiopods; and some anatomists even 
believed that they had discovered transitional characters. A close 
examination shows that there is no relationship of affinity between 
them, but only a resemblance through formal analogy. 
“The parts which seem, at first glance, in each to be identical, prove 
not to be homologous upon investigation. Anomia has really very 
close relations with Pecten, and is connected to the latter by the 
curious genus Hemipecten of Reeve. The perforations in one of the 
valves of Anomia is chiefly a greater extension of the auricular sinus 
in Pecten; and when the very young fry of this genus shall have been 
carefully observed, we believe they will be found spinning a byssus, 
which passing through this in the first instance, before a portion of 
it becomes attached, eventually becomes detached with a part of the 
adductor muscle, and forms the opercular process.” 
Lacaze-Duthiers,? in an elaborate memoir on Anomia, refers to 
1 At one time Vogt and Agassiz believed the dorsal and ventral plates of the 
Brachiopoda to be right and left, like the bivalved shell of the Lamellibranch! 
2 British Mollusca. Vol. 11., p. 322. 
8 Annales des Sciences Naturelles, 1854. 2d Series, v., p. 38. 
