SKELETO-TKOPHIC TISSUES AND COXAL GLANDS. 129 



On the Skeleto-trophic Tissues and Coxal Glands 

 of Limulus, Scorpio, and Mygale. 



By 



E. Ray I/anRester, ]fI.A.« F.R.S., 



Jodrell Professor of Zoology in University College, London. 



With Plates VI, VII, VIII, IX, X, XI. 



1. Introduction. 



2. The entosternites and massive connective tissue of Limulus, Scorpio, 



Mygale, and Apus, and the colloid tissue of Mygale. 



3. The lacunar connective tissue of Limulus and Scorpio : the pignientiferous 



tissue and finer blood-vessels (arterioles). 



4. Keticular connective tissue of Limulus. 



5. The membranous connective tissue of Limulus and Scorpio. 



6. The large-celled (embryonic) connective tissue of Limulus and Scorpio. 



7. The cartilage-like (capsuligeuous) connective tissue of Limulus. 



8. The blood-corpuscles of Limulus and Scorpio. 



9. The coxal glands of the Arachnida. 



10. Minute structure of the coxal glands of Scorpio. 



11. Minute structure of the coxal glands of Limulus. 



12. Minute structure of the coxal glands of Mygale. 



13. General conclusions as to the coxal glands. 



The inquiry into the relationship of Limulus to tlie other 

 Arachnida with which I have now for some time occupied my- 

 self, has led me to institute a detailed comparison of the minute 

 structure of the tissues of tliese animals. Many of my observa- 

 tions have been made by means of sections of whole animals, 

 or of special organs — others have been made upon the fresh 

 and living tissues of Limulus^ of Scorpio, and of Mygale, of all 

 of which I have been able to obtain live examples for study in 

 my laboratory in London. 



VOL, XXIV. — NEW SER. I 



