ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 331 
trunks, and finally into one collecting canal. There is, as Vejdovsky 
described, a urinary vesicle between the collecting canal and the 
exterior, but the Bohemian authority did not describe this accurately. 
It consists of two superposed cavities ; the upper, into which the col- 
lecting canal opens, is spherical ; the lower, in open communication 
with the upper, is cylindrical or pyriform ; the two cavities are sur- 
rounded by the same cellular material as occurs around the collecting 
canal and the canalicules ; there is not a trace of a special cellular 
boundary. 
New Tubificidse.* — Dr. Harriet Randolph establishes a new genus 
Embolocephalus, with two species — E. velutinus ( = Ssenuris velutina 
Grube) and E. plicatus sp. n. The worms have a sheath of viscid 
secretion, with which bacteria and extrinsic particles are associated. 
There are no eyes, but there are sensory papillm in rings around the 
body. The head is retractile. There are dorsal setae on all the setiferous 
segments. 
Salivary Glands of Hirudinea.t — Prof. Leuckart states that the 
efferent ducts of the unicellular salivary glands of Hirudo all run for- 
wards, and are gradually collected into three thick cords ; these lie on the 
inner 3ide of the three long abductors of the jaws, and may therefore be 
easily taken for parts of these muscles ; their granular appearance and 
their histological characters show their true nature. These cords pass 
into the substance of the jaws, where they spread out ; the number of the 
bands correspond to the number of the teeth, but before the cords reach 
the roots of the teeth they divide into two diverging halves which pass 
to the spaces between the teeth, where they open. These facts explain 
how the wounds made by the jaws are at once moistened by the secretion 
of the salivary glands, and have an important bearing on Haycraft’s 
discovery of a substance secreted by the Leech which prevents the 
coagulation of the blood. 
Terrestrial Leech from Chili. :J — M. R. Blanchard has a note on 
Grube’s Hirudo brevis , which he thinks should be placed in a new genus 
to be called Mesobdella , as it is intermediate between the Glossiphoniidas 
and the Hirudinea. Among the latter it approaches Hsemadipsa in its 
mode of life and the arrangement of its eyes; there is, however, a 
marked condensation of the somites. 
Notes on Hirudinea. — Dr. R. Blanchard gives a description of 
Glossiphonia marginata ; § though one of the most common of European 
species, no one has ever given a rational description of it, or fixed its 
distinctive characters in a certain way. With affinities to G. tesselata, 
it is distinguished by its distinct head, which carries only two pairs of 
eyes, the clearer tinge of its yellow spots, and the presence of a medio- 
dorsal row of similar spots. 
In his next notice || Dr. Blanchard gives a description of G. sexoculata, 
* Jenaisclie Zeitschr. f. Naturwiss., xxvii. (1893) pp. 463-76 (3 pis.), 
t Ber. Verh. Ges. Leipzig, vi. (1893) pp. 556-8. 
t Comptes Rendus, cxvi. (1893) pp. 446-7. 
§ Bull. Soc. Zool. France, xvii. (1892) pp. 173-8 (2 figs.). 
|i Tom. cit., pp. 178-82 (2 figs.). 
