434 INVERTEBRATE MORPHOLOGY. 



appendages in these forms, the following table may represent 

 the honiologies of the appendages of the two groups. 



Crustacean. Liniulus. 



1 segment no appendage no appendage 



o << << " << << 



3 " antennules " " 



4 " antennae chelicerae 



5 " mandibles 1st pair of legs 



6 " 1st maxillse 2d " " " 



7 " 2d 3d " " " 



8 " 1st thoracic appendages 4th " " " 



9 2d " " 5th " " " 



10 3d " " operculum 



LITERATUKE. 



A. Gerstaecker. Crustaceen. Bronn's Klassen und Ordnungen des Tkierreichs, 



Bd. V. 1. Abth., 1866-79. 

 A. S. Packard. The Anatomy, Histology, and Embryology of Limulus poly- 



phemus. Memoirs Boston Soc. Nat. History, 1880. 

 E. R. Lankester. Limulus an Arachnid. Quarterly Journ. Microscopical 



Science, xxi, 1881. 

 S. Watase. On the Morphology of the Compound Eyes of Arthropods. Studies 



from the Biol. L:ib. Johns Hopkins Univ., iv, 1890. 

 W. Patten. On the Origin of Vertebrates from Arachnids. Quarterly Journ. 



Microscop. Science, xxxi, 1890. 

 J. S. Kingsley. TJie Embryology of Limulus. Journ. of Morphology, vn, 



1892 ; Tin, 1893. 

 W. Patten. On the Morphology and Physiology of the Brain and Sense-organs 



of Limulus. Quarterly Jouru. Microscop. Science, xxxv, 1893. 



