I20 The American Geologist. February, 1903. 
sively and then returns on the outer side, following- up and 
down each lacune in turn. As the current approaches the main 
pallial opening-, a part of the current is diverted to the outside 
of the lateral sinus, where it runs to the posterior end of the 
body to return on the inner side of the sinus, back to the main 
pallial opening into which it is directed. The sinuses, lacunae, 
and all details are symmetrically developed on each side of the 
median line. * * * * It is difficult to realize, unless one 
has seen it, the vigorous character of the flow of these cur- 
rents. When the damming of the current takes place and a 
rapid accumulation of blood corpuscles piles up at the closed 
openings, the flood is impetuous when it starts again. The 
volume of this flow is so great that if any special organ was 
implicated in its propulsion it would easily be detected. No 
such organ, however, has been found. =1= * * * From the 
above observations on the circulation of the blood in the Lin- 
gulidae, it is certain that a propellent organ or heart is want- 
ing in these animals" (pp. 351-355). 
Students of fossil or living brachiopods cannot afford to be 
without this work of Prof. Morse, and no review will do it 
justice. In conclusion I will here present Beecher's summary 
of this work : — 
"Morse's observations refer principally to the genera Lin- 
gula, Glottidia, Discinisca, Hemithyris, Dallina, Terehratalia 
and Terebratidina. The points of especial interest comprise 
the discussion of the otocysts, pharyngeal glands, the accessory 
hearts of Hancock, the strand-like spermaries, the pallial cir- 
culation, the life attitudes of different forms, and particularly 
the varied and graceful movements of the brachia. The strand- 
like spermaries and the pharyngeal glands are characters here- 
tofore undescribed, and further details are given regarding 
the external glands first described by the author. The pres- 
ence of otocysts in Lingula and Glottidia are definitely shown 
although Blochmann has doubted their existence in these gen- 
era. The organs described by Hancock as the 'heart' and the 
'accessory hearts' have been frequently investigated by various 
observers, but no final conclusion has been reached. The 
author shows that they cannot well belong to the circulatory 
system, but must be regarded as in some way connected with 
the genitalia, though their precise functions have not yet been 
