118 ARACHNIDA. 



distention of the intestinal tract — adaptation, that is, of some much less 

 specialised type than Limulus. All the chief organs are dealt with in detail, 

 and, whether the author's conclusions are all of them ultimately confirmed or 

 not, he has succeeded in placing on a new level, not only the controversy 

 regarding the Arachuidan origin, hut also (by his association of physiology 

 with morphology) the science of the whole group. So far his views have not 

 met with much acceptance, and the Scorpiones are still generally regarded as the 

 most primitive Arachnids finding their nearest allies in the Merostomata. — Ed.} 



LITEKATURE. 

 Arachnida in General. 



1. Croneberg, A. Ueber die Mundtheile der Arachniden. Archiv. 



f. Naturgesch. Jahrg. xlvi. 1880. 



2. Eisig, H. Die Capitelliden des Golfs von Neapel. Mono- 



graphic der Fauna und Flora von Neapel. Berlin, 1887. 

 (On the coxal and spinning glands of the Arachnida.) 



3. Fernald, H. T. The Kelationships of Arthropods. Studies 



Biol. Lab. Johns Hopkins University. Baltimore. Vol. iv. 



1890. 

 4a. Grenacher, H. Untersuchungen iiber das Sehorgan der 



Arthropoden. Gbttingen, 1879. 

 4b. Haase, E. Beitrage zur Kenntniss der fossilen Arachniden. 



Zeitschr. Deutscli. Geologisch. Gesellsch. Jahrg. 1890. 



5. Jaworowski, A. Ueber die Extremitaten bei den Embryonen 



der Arachnoiden und Insecten. Zool. Anz. Bd. xiv. 1891. 



6. Lankester, E. Eay. Limulus an Arachnid. Quart. Journ. 



Micro. Sci. Vol. xxi. 1881. 



7. Lankester, E. Bay. On the sceleto-trophic tissues and the 



coxal glands of Limulus, Scorpio, and Mygale. Quart. Journ. 

 Micro. Sci. Vol. xxiv. 1884. 



8. Letjckart, E. Ueber den Bau und die Bedeutung der sog. 



Lungen bei den Arachniden. Zeitschr. f. Wiss. Zool. Bd. i. 

 1849. 



9. Loman, J. C. C. Altes und Neues iiber das Nephridium (die 



Coxaldriise) der Arachniden. Bijdragen tot de Dierlcunde. 

 Aflev. xiv. Amsterdam, 1887. 



10. MacLeod, J. Becherehes sur la structure et la signification de 



l'appareil respiratoire des Arachnides. Archiv. Biol. Tom. v. 

 1884. 



11. Oudemans, A. C. Die gegenseitige Venvandtschaft, Abstam- 



mung und Classification der sog. Arthropoden. Tijdschrift 

 der Nederlandsche Dierlaindige Vereenigung. (2). Deel i. 

 1885-87. 



