ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
39 
are monomeric or not metamerically segmented. Of the former there 
are two series ; in some the segmental cavities of the larva persist in the 
adult, while in others the septa are destroyed in such a way that the 
definite coelom resembles that of the monomeric Trochozoaria. The 
former may be said to liave persistent segments, the latter to have the 
segments destroyed ; to the former belong the Archiannelids, Hirudinea, 
Archichaetopoda, and Euchaitopoda, and to the latter Siernaspis and the 
armed Gepbyrea. 
The monomeric Trochozoaria contain a certain number of classes, of 
which it is difiScult to estimate the relations ; three series are, however, 
well marked. In the first are the unarmed Gephyrea, in the second the 
Bryozoa, Brachiopoda, and Phoronis, and in the third the Eotifers, 
Ampbineura, and Mollusca. The relations of these are shown in the 
table. 
Trochozoaria 
Polymeric 
Monomeric 
Polymerii intacti P. destructi 
Acliseta Chaetopoda 
1st series 2nd series 
Hirudinea 
Euchaetopoda 
Armed Gephyrea 
Arcliichaetopoda 
Sternaspidea 
Archiannelids 
Brachiopoda 
Bryozoa 
Unarmed Gephyrea 
Phoronis 
TROCHOZOON- 
3rd series 
Mollusca 
Amphineura 
Rotifera 
Earthworms from Western Himalayas and Dehra Dun.* — Prof. 
A. G. Bourne records the presence of Perichseta houlleti, immature 
examples of what is perhaps a new species of Perionyx, and Typhseus 
Masoni sp. n. from Dehra Dun, which lies at the foot of the Western 
Himalayas. From Masouri, which is at an elevation of between 6000 
and 6000 feet, he has received three species of Lumhricus or of some 
allied genus or genera, and two species of Perionyx; the latter were 
immature, and the author refrains from naming the former as he could 
only give an incomplete description, and the literature with regard to 
the genera and species of Lumbricidae is already in great confusion. 
Fletcher has recorded the presence of the same species of Australian 
earthworm at very various altitudes, but in India all the species from 
hill stations seem to ditfer from those of the plains. Among other 
* Journ. Anat. Soc. Bengal, Iviii. (1889) pp. 110-17 (1 ph). 
