1871.] 181 [Wilder. 



a compromise upon a ground between the two extremes seems quite 

 impossible. 



I do not pretend to offer an opinion here, but have not yet seen 

 reason for denying the existence of the radiate idea, and would refer 

 to 45, 14, for suggestions as to a distinction between the morphical 

 term "radiality" and the telical term, "radiation." 



Agassiz evidently includes within the abstract idea of radiality, the 

 existence of a real homology between the several spheromeres; but it 

 is not clear whether the term "radiate" or "radial symmetry" means 

 that each spheromere is symmetrical in itself as is believed by Pittard, 

 293, 850, or with its immediate neighbor, or "antitropically," as im- 

 plied by Agassiz, 200, 3, 260; in short, when any two contiguous 

 spheromeres are compared, do the inner and outer surfaces correspond 

 together, as with two eyes, or does the inner surface of one corre- 

 spond with the outer surface of the other, as with two successive 

 thoracic ribs? is the homology antitropical or syntropical or only 

 general? 



Syntropy. 



Serial homology , Ow., 20, 176; 63, 1, xin. — Symmetry, Ow., Proc. 

 Zool. Soc, 1831, p. 67. — Homology, Gervais, (?). — Unreversed serial 

 repetition, Pitt., 293, 845. — Homotypy, Ow., 63, 2, 361. — Irrelative 

 repetition, Ow., 63, 1, xin. — Reihenfolge oder Nachfolge, Pagens., 54, 

 162.— Serial symmetry, Miv., 277, 292. — Serial actinology, Miv., 278, 

 120. — Homoplastic serial homology, Miv., 278, 119. — Homogenetic se- 

 rial homology , Miv., 278, 119. — Similar parallel repetition, Coues, 70, 

 149. 1 



Syntropy, syntrope, syntropous, syntropic or syntropical. 2 

 Definition. The morphotropic relation between parts upon the 

 same side of a structural plane. 



Example. SeeMekesyntropy, Platesyntropy and Hypsesyntropy. 



Mekesyntropy or Syntropy (nfjxog, length, and syntropy). 



Irrelative or vegetative repetition, Ow., 20, 176, (1846), 63, xin, 

 (1866).— Unreversed serial repetition, Pitt., 298, 845, (1850).— Serial 

 homology, Ow., 63, 1, xn (1866). — Longiserial homology, Wild., 58, 

 Lect. 1, 1867. — Homogenetic serial homology, Miv., 278, 119 (1870). 



1 With few exceptions, the synonyms for the names of ideas are given in chrono- 

 logical order. 



2 The other terms may be similarly inflected. 



