622 
ZOOLOGICAL LITERATURE. 
and in the scuta, walls, and septa, with assimilis j but the well-de- 
veloped shining and peculiarly striped radii, as well as the struc- 
ture of the upper lip, were decidedly those of B. armatus ; the 
number of pairs of bristles at the last cirri was intermediate 
between both. Only four specimens of this intermediate form 
could be obtained during a month among at least 400 speci- 
mens of B. armatus and B, assimilisj which are in countless 
numbers on that coast. It may occur often that one species 
receives spermatozoa from another ; but probably a fecundation 
will be successful only if the same individual does not receive 
simultaneously a spermatozoon from its own species. There- 
fore not where many specimens of both species are living to- 
gether, but only where a specimen is almost solitary among 
many of the other species, is there a good chance of originating 
hybrids. F. MUller, Arch. f. Naturgeschichte, xxxiii. pp. 345, 
356, pL 7. figs. 29-43, and pi. 8. figs. 45 and 49. 
The first stages of development of Balamcs sulcatus and Anatifa 
vulgaris are described by Hesse, Ann.* Sc. Nat. vii. pp. 123-128, 
pi. 2. figs. 1-9, and pp. 134, 135, pi. 3. figs. 1-7. In a footnote, 
p. 142, some biological observations are added concerning Ana- 
tifa; the stalk is fixed to objects by a calcareous layer which 
can be easily taken off with a thin knife from wood, without 
injuring the stalk : if the stalk is seriously w^ounded the animal 
dies j the elongation and tux’gescence of the stalk, as well as the 
lively movement of the cirri, are the best proof of the health 
of the animal arid gradually vanish with it. 
Balams armatus j sp. n.,F. Miillor, Arch. f. Naturgeschichte, xxxiii. p. 329, 
pi. 7. figs. 1-28, on sponges, polypes, and rocks, Desterro, Southern Brazil. The 
third pair of the cirriferous feet is armed with numerous strong hooked teeth j 
similar teeth occur in Acasta, hut on the fourth pair. As both live on and 
in sponges, the author thinks that these teeth serve to tear off and remove 
the overgrowing pieces of the sponge. 
SaCCULINIDtE. 
Sacculinidia gibbsii, sp. n., Hesse, Ann. Sc. Nat. vii. p. 878, on Pisa gibbsvi; 
S. herbstii, sp. n., Ilesso, ibid. p. 880, on Ilarbsiia cotuhjUata. The author 
states it as a rule that one species is always infested by the same species of 
parasites also among Crustacea, p. 877. 
PVCNOGONID^. 
Phoxichilus inermis, sp. n., Hesse, Ann. Sc. Nat. vii. p. 199, found on a 
ship returning from the Mediterranean. 
Oiceobathes, g. n. Two pairs of appendages at the head, called antennae 
by the author, but without doubt homologous to those of Nymphon, Legs 
stout and rather short, as in Pycnogonum. O. arachne, sp. n., Brest, in a depth 
of 60 metres. Hesse, Ann. Sc. Nat. vii. p. 201 and p. 214, pi. 4. figs. 1-6. 
