complicated liver of the adult, as seen in E, which represents the 

 animal about an eighth of an inch long. The arms (lophophore) 

 begin " to assume the horse-shoe-shaped form of Pectinatella and 

 other high Polyzoa. The mouth at this stage begins to turn to- 

 wards the dorsal valve (ventral of authors), and as the central lobes 

 of the lophophore begin to develop, the lateral arms are deflected as 

 in F. In these stages (G) an epistome 1 is very marked, and it was 

 noticed that the end of the intestine was held to the mantle by an 

 attachment, as in the adult, reminding one of the funiculus in the 

 Phylactolsemata" (Polyzoa). Turning now to Kowalevsky's me- 

 moir, he shows, according to Mr. A. Agassiz, that the larvae of 

 Brachiopods are strikingly like those of the Annelides. "The 

 homology between the early embryonic stages of Argiope with 



blance between some of the stages of Argiope figured by Kowa- 

 levsky and the corresponding stages of growth of the so-called 

 Loven type of development among Annelides is complete. The 

 number of segments is less, but otherwise the main structural 

 features show a closeness of agreement which will make it diffi- 

 cult for conchologists hereafter to claim Brachiopods as their 

 special property. The identity in the ulterior mode of growth 

 between the embryo of Argiope and of Balanoglossus, in the 

 Tornaria stage, is still more striking. We can follow the changes 

 undergone by Argiope while it passes through its Tornaria stage, 

 if we may so call it, and becomes gradually, by a mere modifica- 

 tion of the topography of its organs, transformed into a minute 

 pedunculated Brachiopod, differing as far from the Tornaria stage 

 of Argiope as the young Balanoglossus differs from the free swim- 

 ming Tornaria. In fact, the whole development of Argiope is a 

 remarkable combination of the Loven and of the Tornaria types 

 of development among worms." 



i close of his first memoir Morse again insists < 



t the close 



lip of the Brachiopods and Polyzoa ; these views, taken 

 with his later views as to the close relationship of Lingula with 

 the Chaetopod worms, show how intimately the Polyzoa and Brach- 

 iopods are bound together with the Annelides. 



' The free lip seemed to perform all the functions pertaining to the ^'j 8 ' 01 " 6 ^" 

 n, t "I i"R the same homologieal position in regard to the flexure of the intestine. 



