THE observations which are recorded in the following pages were commenced five years ago
with the definite object of attempting a step towards the solution of certain problems which …

During a stay at Naples in the past winter, I became acquainted with a great number of
Nemertini which had escaped my notice on a former occasion (1874), and of which I could have …

It was in September 1884 that the collection of the Challenger Nemertea was handed over
to me for investigation, on the express condition that the whole of the MS. and plates were to …

In the present paper I have attempted to bring together the results of new investigations and
recent reflexions with such as had already been published on earlier occasions, but which, …

Het anatomisch onderzoek van eenige Nemertinen-soorten, waarvan de uitkomsten in de
volgende bladzijden vervat zijn, werd grootendeels gedaan in het Zoologisch Station van Dr. …

An all important question was raised in biology when the Law of Development came to be
recognised as the only true explanation of the facts as they lie before us. This was the question…

In venturing at the close of my Report on the Nemertea, collected by ILM.S. “Challenger,” to
leave the region of demonstrated facts and actual observations, and to enter upon that of …

As a sequel to my investigations on the placentation of the hedgehog ('Quart. Journ. of Microscop.
Science/vol. xxx, part 3, 1889) I was very anxious to collect a similar series of data with …

Zij is geslachtsrijp van Maart tot Mei, bij uitzondering werden somtijds rijpe geslachtsproducten,
geschikt tot kunstmatige bevruchting, in Augustus aangetroffen. De eieren worden …

OF all embryological problems those concerning the gastrulation process of the Amniota and
the formation of their mesoblast and notochord may certainly be said to be at the present …