696 Recent Literature. | November, 
as the cephalic end of our bilateral figure, and looking inwardly 
we shall see the flat stomach forming the sectant plane, which, 
extended in imagination in two opposite directions, would strike 
the periphery of the body along two dorsal and ventral lines one 
undred and eighty degrees from each other, and then, projected 
still further away from the mouth, would terminate finally in the 
posterior, adherent discoid end. Parallel-wise with this plane all of 
the partitions of the digestive cavity trend, like a series of super- 
posed shelves or galleries, in direct lines from the region lying 
right and left of the mouth, and of the flattened parallel sides of 
the stomach, backward along the inner face of the cylindrical 
periphery, so as to subdivide the included space into as many 
longitudinal corridors. It is these partitions which, by their mul- 
tiplied sameness, constitute, among others, the elements that 
embody the dorso-ventrally repetitive type; the true ideal, as we 
firmly believe, upon which this grand division is founded. 
“ We think we shall be understood now when we say that the 
multitudinous chymiferous canals of the disciform Atquorea and 
the quadruple channels of the cylindrical bell of Sarsia are two 
widely separated extremes of dorso-ventrally repetitive fae ee 
the 
or that the numerous ambulacea of Solaster and ve of 
Asterias represent two extremes of dorso-ventral repetition, 
hrown d, ‘into rank,’ to the same line with the m uth ; 
ficial feature, not always constant in Cuvier’s Radiata, though 
h 
tiful memoir was evidently designed to cover at least fifteen por 
as reference is made to several chapters composing Part xv, On y 
two parts having an actual existence. A broken s i 
represent both the author’s life and this posthumous work, rig 
symmetrical and thoroughly finished to the point where they 
suddenly broke off. : 
Recent Books AND PAMPHLETS.—Appunti Ittiologica sulle collezioni Ber" 
Civico di Genova. Per D. Vinciguerra. 1. Enumerazione di alcune specie ole 
ii O. Beccari, 1879. (Ext. from Ann. del Mus. ©! T 
io, 9 Giugno, 1879.) 8vo, pp. 14- „1i ask 
(Tay. 1.) (Ext. from the same J urnal, 
_ Vol. x1v, Agosto, 1879.) 8vo, pp. 19. From the author. ; 
