ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
309 
endosternite of the embryo is weakly developed when compared with 
that of the adult. A tubular granular invagination occurs on the 
rostrum behind the eyes, directed towards the brain. 
New Sarcoptid.*' — Dr. E. Trouessart has found on the beaver, already 
remarkable for its parasitic Coleoptera ( Platypsyllus castoris and Lep- 
tinillus validus), a new Sarcoptid, which he names ScJiizocarpus Mingaudi 
g. et sp. n. This new form adheres to the beaver’s hairs by means of 
its peculiarly modified anterior limbs, which are quadrangular discs 
with a deep median groove. It occupies a position between Chirodiscus 
Trt. and Labidocarpus Trt., differing from the latter in having normal 
posterior limbs, and from both in the adherent groove above-mentioned. 
e. Crustacea. 
Abnormality in Crab.'f — Herr A. Bethe describes a specimen of 
Carcinus with a large right-handed walking leg on the left side of the 
fifth abdominal segment. It was innervated from a small surplus half- 
ganglion on the right side between the claw-ganglion and the ganglion 
of the first walking leg. 
Gammarus Berilloni.j: — M. E. Chevreux describes this species, which 
was first determined by J. D. Catta. It has hitherto been found in 
streams and lakes in the region of the western Pyrenees, but Chevreux 
found it at Jersey along with G. pulex. Its distribution is thus some- 
what puzzling, especially since the transport of Gammarid eggs by 
migratory birds is out of the question. 
The Genus Ourozeuktes.§ — Mr. A. Vaughan Jennings describes and 
figures the external characters of this remarkable form, of which only 
dried specimens have been hitherto noticed. The specimen, probably 
from near Kerguelen Island, was nearly two inches in length by more 
than an inch in breadth ; but an enormous brood-chamber, three-quarters 
of an inch in depth, made the body appear almost globular when viewed 
from in front. In the brood-chamber there were several larvm, which 
are also described. Probably the nearest living relative of Ourozeuhtes 
is the remarkable genus lclitliyoxenos , which occurs in cavities of the 
skin of a Javanese fish ( Puntius maculatus). It is less specialised than 
Ourozeuhtes in having the abdominal segments free, the first abdominal 
appendage scarcely modified, and the thoracic limbs unflattened. It 
seems likely that the genus under consideration is a temporarily parasitic 
descendant of some form similar to Anilocra, 
Mexican Terrestrial Isopods. || — M. A. Dollfus describes Armadillo 
Dugesi and Metoponorthus Saussurii spp. nn. The Isopod fauna of Mexico 
seems to be relatively sparse, and not much is known of it. It seems to 
have more affinities with that of the temperate parts of the States than 
with that of the tropical regions of America. 
Hermaphroditism in Apodidae.«[ — Mr. H. M. Bernard notes that 
three species — Lepidurus glacialis, L. productus, and Apus cancriformis — 
* Bull. Soc. Zool. France, xxi. (1896) pp. 22-3. 
f Journ. Mar. Biol. Ass., iv. (1896) pp. 144-5 (1 fig.). 
X Bull. Soc. Zool. France, xxi. (1896) pp. 29-33 (3 figs). 
§ Journ. Linn. Soc. Zool., xxv. (1896) pp. 329-38 (2 pis.). 
i| Bull. Soc. Zool. Frauce, xxi. (1896) pp. 46-9 (2 figs.). 
Ann. and Mag. Nat. Hist., xvii. (1896) pp. 296-309 (2 pis.). 
