12 Dana on the Classification of Animals 
respiration, peraquatic. The latter has been observed on page 
330, (Art. [.) to have a dilutive effect on the materials and 
menopters, and a the other species. Condition a may occur in 
inferior grades, as among Coleopters, apparently through degrada- 
tion.—Inf., (B) prematurative, or passing through no period of 
fest in the young state, as in Insects undergoing no complete 
28 
= 
having the power of budding.—Jnf, (B) hemiphytoid, either in 
accompanied by a fundamental change in plan of structure, but 
not in accordance with any of the methods enumerated, it being 
The distinction between Megasthenes and Microsthenes under Mam- 
mals is of this kind (p. 338); also that of Mammals and Birds; also that 
Insecteans and Crustaceans among Articulates. In the last, there 
se | three segments. Moreover, in the highest Ohaitbeaiein the Crabs, 
includes three more body-segments than in Insects. ‘The differ- 
ences also between Hymenopters and Dipters (see p. 17), Lepidopters 
and Homopters, Coleopters and Hemipters, exemplify a general lower- 
ing of the grade of structure, not referable to any special one or two of 
the methods of cephalization. The general term potential is applied to 
cases like the above on page $22 of Art. I, as a convenient term, though 
Internal eharaeteristies, as those of the digestive, reproductive 
