630 
VEKMES. 
Barrois, in a preliminary note (1) describes the evolution of “ iVe- 
mertes communis^ V. Ben.” {^Lineua sanguineus, McI.J as intermediate 
between the complex metamorphosis of the -type, and the 
simple evolution of the “ Desorian ” larva. 
According to Marion (9), the embryos of Borlasia hefersteini are set 
free in May, developed into worms in June and July ; in October they 
are still asexual or provided only with spermatic vesicles, which in De- 
cember are found in all specimens ; but as they advance in size, the 
female elements begin to appear in February, becoming successively 
equally abundant or ultimately predominating. The eggs are deposited 
in hyaline sheaths attached to the walls of the gill cavity of their asci- 
dian host. 
Graff (2) has contributed observations on fissiparity in ^dme. Micro- 
stomum and on several points of the anatomy of various Turhellaria, 
which are named below. 
Moseley has studied (11) in great detail the anatomy and histology 
of some Ceylonese Land- Planarians, e?;tending his researches compara- 
tively to some European marine and freshwater forms. An analysis of the 
paper being out of the question, as in the case of other works of similar 
scope and importance, a few points only may here briefly be alluded to ; 
e. g., the discovery of a row of papillae and ciliated pits in the anterior 
border of the head in Bipalium, which is often protruded in tentacle- 
like fashion ; the analogies in structure between Leeches and terrestrial 
Planarians ; the anterior position and reduced number (two) of ovaries 
compared with the serial arrangement and large number of testes in 
Bipalium and Rhynchodemus, the numerous widely dispersed eye-spots 
in the former genus, the 2 more developed and forward placed eyes in 
the latter ; the great difference in the form of the mouth in these genera ; 
the homology between the “ primitive vascular system ” in Planarians, 
and the body-cavity in Embryo- Leeches, and in Branchiohdella. The 
ganglionated nerve strings described by Blanchard and Schmarda have 
no existence, ovaries and testes having been mistaken for ganglia. 
Classification : Genera and Species. 
The following review of the genera and species of British Nemerteans 
described by McIntosh (6) will afford at the same time a condensed 
account of the more important anatomical characters, distinguishing the 
suborder and its divisions, families, genera, &c. 
Nemertinea. Worms with more or less elongated, soft, ciliated bodies, 
furnished with a thick glandular cutis, beneath which the body wall is 
composed of several strong, specially disposed muscular layers ; nervous 
system composed of 2 conspicuous ganglia, connected by a double com- 
missure, and 2 main lateral trunks running backwards to the end of the 
body. Through the centre of the body cavity, and entirely beneath the 
nerve commissures in front, passes the digestive system, a ciliated canal 
with 2 well marked divisions, and 2 apertures, an oral anteriorly, and an 
anal posteriorly. Circulatory system consisting of a series of closed 
contractile vessels. The complicated proboscis is placed along the 
