REVIEWS AND BOOK NOTICES. 49 
Considering the arms alone we are told that a transverse section 
of: a right arm of Amphitrite (Fig. 24) resembles that of Lingula, 
(Fig. 25) much more than ‘corres- Fig. 24. Fig: 25. 
ponding sections of two Brachiopods l 
resemble each other.” 
Bristles like those of worms, moved 
by muscles, and quite unlike the stiff 
spines of the Chitons occur in the 
Brachiopods. The muscles of the 
integument bear the closest resem- 
blance to those of worms. The peri- 
visceral cavity is shown to be, like 
: ; Transverse sec- 
that of worms, lined with a delicate sectionofarm tion of arm of Lin- 
of Amphitrite gula pyra amidata. 
trilubrum. 
ci, cirri; bf, brachial fold; s, sinus. 
eo 
2 
membrane and strongly ciliated. 
_ Prof. Morse has succeeded in finding 
a vessel on the dorsal surface of the intestine of Lingula, but not 
the vesicle described by Hancock. But still he, as well as others, 
Fig. 26. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
À 
\A 
\ 
A 
NA 
MA 
Amicula Emersonii. Nerine cirratulus. Discina. 
ihe papae Deciduous seta Deciduous seta 
— muscular pi EAk worm, of larval Discina, 
layer cirratulus, from Fritz Miiller. 
the girdle; Som C Claparède. 
bristles ime magni- 
2 f girdle; b, 
has never succeeded in studying the vascular system satisfactorily. 
He, however, alludes to a pseudo-hæmal system of organs, being 
a set of membranes which invest the oviducts, and has traced the 
circulation in living arip hae This subject, and the circula- 
AMER. NATURALIST, VO. 4 : 
