456 E. A. ANDREWS. 
branches from the main system found in the trunk and 
directly continued into the main terminal. The side terminal 
repeats all the organs of the main terminal, having digestive 
tract, nerve, blood-vessels, muscles, reproductive cells (male), 
and anal opening, just as in the main terminal. It is an 
exact repetition, and differs only in small size, fewer somites, 
and abnormal coloration upon its left dorsal half. 
The following table will serve as a summary of the general 
character of the above eight abnormal specimens of Podarke. 
The first column gives the number of somites anterior to the 
bifurcation, the second the number in the right terminal, the 
third those in the left, the fourth the entire number in the 
chief or main axis, while the entire number of all the somites 
is given in the last column. 
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B; Dine iy SQ eee AK edb eG 
CG, J 1S. ett 98) oe wllOe. 2acSb ene 
Ne 2 DO nth aE OO be ope fOr ones tak O pee 
W, 3 Bb ee Ose 8 ee ee 
x, OO ee Sf et LS. oe werden) aD 
yy, 9 OF sw Ee Oe 8a ee 40-5 
(Ane LGriy.) (eaWBeas WAAR eae: eee 
CoNncLUSION. 
From the above description we find that these ten cases of 
bifid monsters agree with those previously described amongst 
the Annelids in that we have to deal with a complete duplica- 
tion of part of the body, the main axis and all its appurtenances 
being exactly duplicated for a certain distance. The only 
exception, and a very marked one, is the earthworm B, which 
has a side duplication in which the entodermal part is absent. 
This absence of entoderm in what is otherwise a normally 
developed and metameric region of the Annelid, is of consider- 
able interest with reference to the ccelom theory and its appli- 
cations to the explanation of metamerism. When so perfect a 
metameric part of an Annelid may be formed, even abnormally, 
without the presence of an entodermal core, we have an addi- 
tional reason for doubting that the ultimate explanation of 
