48 REVIEWS AND BOOK NOTICES. 
it is it forms a broad cephalic collar, “covering the base of the 
arms in those worms possessing it (as in Sabella, Fig. 19), while in 
the Brachiopoda the collar covers and protects the arms,” and this 
collar is not to be compared with the mantle of mollusks. On 
Fig. 22. 
‘Longitudinal section of anterior portion of Lingula. 
Fig. 23. 
Longitudinal section of anterior portion of Amphitrite ventrilabrum. 
mouth; æ, esophagus; st, stomach; a, arm; ci, cirri; bf, brachial fold; cb, carti- 
lngmons base of arm; 8, sinus leading to arm; ce, :, cephalic seller or pallial membrane- 
page 27 the cephalic region of the true worms is discussed, and 
the intimate relationship between the head of certain worms, such 
as Sabella and Amphitrite, and that of the Brachiopods, shown. 
This can be seen by a glance at the accompanying figures. 
cannot farther abstract the condensed statement of the author: 
By making a longitudinal section of the worm Amphitrite, and q 
the brachiopod Lingula, the most interesting relationship may 
detected (Figs. 22 and 23). 
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