spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by NEEDHAM, A. E.
Right arrow Search for Related Content
PubMed
Right arrow Articles by NEEDHAM, A. E.

Quarterly Journal of Microscopical Science, Vol s2-79, 559-588, Copyright © 1937 by Company of Biologists

Memoirs: Some Points in the Development of Neomysis vulgaris

A. E. NEEDHAM

1. Certain muscle systems, alleged to be ectodermal in origin in Hemimysis, appear to be mesodermal in Neomysis.

They are:(a) The extensor and flexor muscles of the limbs.

(b) The carapace fold muscles of the maxillary and thoracic 1,2, 3 segments.

(c) The interparagnath muscle.

2. There is no clear indication of cellular ectodermal tendons.

3. Evidence is given that the liver is of endodermal origin and derived from the yolk-pyramids in Neomysis.

4. The telson mesoderm appears to be derived from that of the last (7th) abdominal segment, there being no post-segmental mesoderm in Neomysis.

5. The median dorsal organ may be an important agent in the hatching processes. Later it draws in and resorbs the superfluous extra-germinal ectoderm.

6. The dorso-lateral organs probably correspond to the ‘tegumental glands’ of adult Crustacea.

7. During one phase of its development the gonad of Neo-mysis sometimes shows a restricted metameric segmentation.






© The Company of Biologists Ltd 1937