662 REVIEWS. 
special organs, and the latter including those types in which 
we have such special structures in the form of contractile 
vesicles, nuclei, or other differentiated appendages. So far 
as the structure of the sarcode is concerned, Bathybius is 
apparently a true Monera, and such its discoverer considers 
it to be. At the same time, the existence in connection 
with it of Coccoliths and Cyatholiths indicates the necessity 
for separating it from Hickel’s other Monera, which have no 
such special appendages. But the time has not arrived for 
determining the absolute relations of these objects. New 
types, as Hàckel himself admits, are being discovered, ren- 
dering modifications of his groups necessary. Meanwhile 
there can be no question that Bathybius is the lowest of 
those known Protozoa, which, like the Foraminifera, secrete 
calcareous elements. Remembering the extent to which the 
sarcode is diffused through the mud of the Atlantic, there 
appears much that is suggestive and important in the obser- 
vation of Dr. Carpenter, that, had its power of secreting a 
calcareous framework been somewhat increased, so that in- 
stead of detached structures in the form of Coccoliths, ete., 
it had produced a continuous calcareous mass, it would have 
given us a living prototype of the Laurentian Eozoon. The 
discovery of this widely and continuously diffused Bathybius 
strongly sustains Dr. Carpenter in his conviction of the ani- 
mal origin of that primeval structure.— Popular Science 
Review, October, 1869. 

REVIEWS. 
ne 
REsULTS or DEEP SEA DREDGING BETWEEN CUBA AND FLORIDA.*— Mr. 
A. Agassiz makes a “ Preliminary Report on Echini and Starfishes Dredged 
in Deep Water." Part Ist is devoted to descriptions of new genera and 
ang Bulletin of the Museum of Comparative Zoology, No. 9, Preliminary Report on the Echin 
alee 'arfishes Dredged in Deep Water between Cuba and the Florida Reef, by L. F. de Pour- | 
"Mes, Ass’t U. S. Coast Survey, Prepared by Alexander Agassiz, pp. 253-318. j 




