and these nine genera are old Tertiary forms. He, therefore, thinks 
that the two faunae have been distinct since the Tertiary. In the At- 
lantic he recognizes two divisions, — a West Indian and a Brazilian. 
'Worms. — The development oi Peripatus novce-zealandicus receives 
elucidation from Miss Lilian Sheldon in the Quarterly Journal of Micro- 
scopical Science for December. The eggs were removed from the uterus 
immediately after the mother had been killed with chloroform. Out of 
forty-five examples, twenty-two were males and nine females without 
ova : the others had from seven to eighteen eggs. The ovum is heavily 
charged with food-yolk. The development is antrolecithal, and the 
protoplasm is mainly at one pole. From the stages of development 
observed on embryos extracted in December, April, January, and 
July, Miss Sheldon concludes that the ova pass from ovary to uterus in 
December, and that the young are born in July. 
Mr. F. E. Beddard {Quart. Jour. Micr. Sci., Dec. 1888) has an 
article on certain points in the strutures of Urochseta, with especial 
reference to the excretory system of it and other earth-worms. The 
paper also includes a description of Dichogaster damonis, n. gen. et 
sp. The uTiter concludes with a review of the various modifications 
of the nephridial system found on earthworms, commencing with 
Perichaeta, in which the nephridial network is continuous from segment 
to segment, and thus distinctly comparable with that of the Platy- 
helminths, and ending with Lumbricus, in which there is but a single 
pair of nephrida per segment. In Dichogaster (as in Acanthodrilus) 
the network of nephridial tubules is discontinuous at the septa, and 
the tubules are longer, less abundant, and occupy less space than in 
Perichasta. In Dichogaster the nephridia of the posterior segments 
are larger, and open by a single coelomic funnel. In Dinodrilus some 
specimens show a slight connection from segment to segment. 
Crustacea.— M. R. Koehler has studied the so-called scales of the 
peduncle of Pollicipes, and states that they are not comparable with 
those of the peduncle of Scalpellum, but have a peculiar and compli- 
cated structure, and are not properly scales. Their form is that of 
rectangles with rounded angles, and they are ranged in longitudinal 
and oblique lines ujjon the chitinous layer of the peduncle. 
MM. A. (irird and J. Bonnoir have discovered a cryptoniscian iso- 
pod parasitic upon the amphipod Angelisca diadema. It is the first 
epicaridan that has been discovered upon an amphipod, and in its 
characters approaches Cryptothiria marsupialis. It has been named 
Podascon dellevalki. Not less curious is the discovery by the same 
