566 
POPULAR SCIENCE REVIEW. 
two factors, one of them finding its expression in the trophosome, and the 
other in the gonosome. 
Sphcerularia Bombi. — This curious entozoon, which is found in the 
abdomen of the common humble bee, has been submitted to a minute 
examination by Mr. John Lubbock. These worms are so like the 
normal tissues of the insect’s body that it is exceedingly difficult to 
distinguish them ; and from the fact that they will live for a con- 
siderable period of time in water, it seems probable that they effect 
entrance into the body of the bee when the latter is “ferreting about, 
as it were, among moss and long grass.” The sexes have been clearly 
pointed out, though as yet the male is known rather by negative than by 
absolute characters. The ova are never actually laid until the middle of 
April, and the young are not hatched out till a month later. The ovary 
consists of a mass of elongated lozenge-shaped cells, each with a distinct 
nucleus and nucleolus. No eggs appear to be produced in the lower 
portioffof the ovary, which may be called the uterus, but they seem to arise 
in the upper part of the long single tube which constitutes the female 
generative organ, and to be pushed gradually forward by the pressure from 
behind. — Vide Natural History Review , April. 
The Brain of the Chimpanzee. — When some time ago Professor Huxley 
asserted that man is not the only animal which possesses a cerebrum that 
overlaps the cerebellum, grave comparative anatomists assured him that 
he must have been mistaken. Since that date, his statement has been 
verified .by hoots of observers, and now Dr. Embleton, of the University 
of Durham, gives the following evidence, as deduced from an examination 
of a young ape’s brain : — The vault of the cranium having been removed, 
a correct cast of the whole cerebral^surface was secured. Before the brain 
was in any way disturbed from its natural position, the relation of the 
posterior lobes of the cerebrum to the cerebellum was carefully observed, 
and the persons present, anatomists and naturalists, were unanimous in 
declaring that the former projected backwards over the latter a quarter of an 
inch. In the removal of the brain the disposition of the membranes and 
nerves was observed to be strikingly similar to the corresponding human 
part. The arterial circle of Willis was quite human. 
Alternation of Generations in the Annelida. — Professor Agassiz has 
found lately in the Boston harbour a species of annelid, Autolytus cor nut us, 
which exhibits this phenomenon : the males are very unlike the females, 
and there also exists a third form — the asexual, which produces the 
other by gemmation at * its posterior extremity. The females at the 
moment of their detachment from the agamic individuals possess no 
ovigerous sac ; but this is soon formed and the ova are produced in its 
interior. The embryos are rapidly developed, and their escape from the 
sac appears to cause the death of the female ; at least, Professor Agassiz 
has never met with females after their embryos have escaped. The 
embryos at the moment of issuing from the sac have a triangular outline, 
their body diminishing rapidly towards the posterior extremity. — Vide 
Journal of the Boston Society of Natural History , viii., p. 392. 
