.954 Mr. A. Hancock on the Larval State of Molgula, 
mity a little constrieted and produced, and the tail with the 
extremity furnished with a long filamentous process. 
This memoir has apparently been overlooked by M. Lacaze- 
Duthiers; and this might easily happen, since we have seen 
that the species was described as an Ascidia. T. 
ut this is not all. We have ourselves detected the tadpole- 
like larva in another species of Molgula, which is described in 
the sequel of this communication, under the name of M. com- 
planata. This is assuredly a true Molgula, having, however, 
one or two peculiar characters, the most striking of which is 
the unusual arrangement of the oviducts, which in this species 
pass from the posterior extremity of the genital masses, and 
are directed towards the dorsal region, while in all the other 
species of the genus they issue from the opposite extremity of 
the organs, and open directly into the atrium ; and, moreover, 
the eggs are retained in the water-spaces between the branchial 
sac and the mantle until the larve are hatched. This is also 
a peculiar feature; for in all the other species that we have 
examined the eggs appear to escape at once by the excurrent 
tube, and to be developed externally. 
There can be no mistake in regard to the fact respecting 
pe Which, however, when seen laterally, is found to be 
Thus we have two species of well-characterized Molgule 
that pass through the tadpole- larval stage. Is it then really 
a fact that in this genus there are two distinct modes of de- 
Alder and Hancock, described in the ‘Transactions of the 
Tyneside Naturalists’ Club’ (vol. i.p. 197); but the charac- 
ters of this species were, on subsequent examination, found to 
differ so much from those of the genus to which it had been 
assigned, that the late Mr, Alder and myself thought it neces- 
