ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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ductive organs, and gives some account of the eggs and six-hooked 
oncospheres. 
Regeneration in Planarians.* — Miss H. Randolph finds that if 
Planaria maculata Leidy is divided longitudinally or transversely, each 
part regenerates a new individual. Fragments hardly visible can re- 
generate a complete whole, except as to pharynx. Double heads, double 
tails, extra eyes, &c., seem to be readily producible. 
Prof. 0. Fuhrmann j reached similar results. A posterior half 
regenerates head and eyes, an anterior half regenerates the posterior 
part and the pharynx. Each of 10—15 fragments showed itself able to 
regenerate. Longitudinal division also succeeded ; if the cut is oblique, 
the regenerated part is perpendicular to the plane of the cut. Monstro- 
sities with 2-4 heads and as many tails were produced. 
New Planarians.^ — Mr. W. McM. Woodworth describes some new 
forms from the Great Barrier Reef: — Pseudoceros devisii sp. n., of a 
bright orange-yellow colour and brilliant markings (only one specimen) ; 
Idioplana australiensis g. et sp. n., differing from other Planoceridm 
chiefly as regards the reproductive organs ; DipostJius corallicola g. et 
sp. n., with male organs so peculiar that a new family (Diposthid^e) is 
required. The salient feature is the separation of the penis and pro- 
state gland into two distinct organs, both of which are doubtless intro- 
mittent. 
Incertae Sedis. 
Sexual Conditions of Myzostoma glabrum.§ — Dr. J. Beard returns 
to a subject which he discussed in 1884, and publishes an interesting 
critical paper on the researches of Nansen, Prouho, and Wheeler, with 
an account of additional observations of his own. His results, apart 
from suggestive obiter dicta on hermaphroditism and the like, may 
almost be summed up in the last paragraph of his paper. 
“ Owing to the various kinds of parasitism presented by the numerous 
species of the genus, parasitism, which in some cases has tended to the 
preservation of the males, in others to their extinction, in yet others to 
their conversion into hermaphrodites, we can, so far as at present known, 
divide the species up into : — 
1. Purely dioecious forms with small males (von Graaff, Prouho). 
M. pulvinar and some cysticolous species. 
2. Hermaphrodite forms with true males which remain males (Beard). 
M. glabrum. 
3. Hermaphrodite forms with males which, retaining their positions 
on the hermaphrodites, afterwards become female (Prouho) 
M. alatum. 
4. Hermaphrodite forms, in which the males have lost their dor- 
sicolous position, and have either become extinct or converted 
into protandric hermaphrodites.” M. cirriferum and others. 
* Arch. Entwickmech., v. (1897) pp. 352-72 (10 figs.). See Zool. Centralbl., v. 
(1898) p. 263. 
t CR. Soc. Sci. Nat. Neuchatel, 1898. See Arch. Sci. Pkys. et Nat., v. (1898) 
pp. 478-9. X Bull. Mus. Zool. Harvard, xxxii. (1898) pp. 63-7 (1 pi.). 
§ MT. Zool. Stat. Neapel, xiii. (1898) pp. 293-324 (1 pi.). 
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