EMBRYO-LOGICAL SYSTEMS. 361 



I. HYPOCOTYLEDONES, or HYPOVITELLIANS. (Vertebrata.) The vitcllus 



enters the body from the ventral side. 

 CL. 1. MAMMALIA. (Primates, Cheiroptera, Insectivora, Rodeutia, 



Carnivora, Edentata, Proboscidea, Ungulata, Siienoidea, Ce- 



tacea.) 

 CL. 2. BIRDS. (Psittacete, Rapaces, Passeres, ColumbEe, Gallinae, Stru- 



thiones, Grallac, Palmipedes.) 

 CL. 3. REPTILES. (Crocodili, Chelonii, Ophidii, Saurii, Pterodactyli, 



Simosauri, Plesiosauri, Ichthyosauri.) 

 CL. 4. BATEACHIANS. (Labyrinthodontes, Peromelia, Anura, Urodela, 



Lepidosirenia.) 

 CL. 5. FISHES. (Plagiostomi, Ganoidei, Teleostei, Cyclostomi, Lepto- 



cardii.) 



II. EPICOTYLEDONES, or EPIVITELLIANS. (Articnlata.) The vitellus enters 



the body from the dorsal side. 

 CL. C. INSECTS. (Coleoptera, Neuroptera, Strepsiptera, Hymenoptera 



Lepidoptera, Diptera, Orthoptera, Heuiiptera, Thysanura, Pa- 



rasita.) 



CL. 7. MYRIAPODES. (Diplopoda, Chilopoda.) 

 CL. 8. ARACHNIDES. (Scorpiones, Araueae, Acari, Tardigrada.) 

 CL. 9. CRUSTACEA. (Decapoda, Stomapoda, Amphipoda, Isopoda, La3- 



modipoda, Phyllopoda, Lophyropoda, Xiphosura, Siphono- 



stoma, Myzostoma, and Cirripedia.) 



III. ALLOCOTYLEDONES or ALLOVITELLIAXS. (Mollusco-Radiaria.) The vi- 

 tellus enters the body neither from the ventral nor from the 

 dorsal side. 



CL. 10. MOLLUSCA. Including Cephalopoda, Gasteropoda, Poccilopoda, 

 and Brachiopoda. (Acephala, Tunicata, and Bryozoa.) 



CL. 11. WORMS. (Malacopoda, Aunelides, Sipouculides, Netnertini, 

 Nematodes, Acanthocephali, Scoleides, Hirudinei, Treuiatodes 

 Cestodes, Rotiferi, Planarise.) 



CL. 12. ECHINODERMS. (Holothurise, Echiuides, Stellerides, Crinoides.) 



CL. 13. POLYPS. Including Tuuicata, Bryozoa, Anthozoa, Alcyonaria, 

 and Medusae, as orders. (Ctenophorse, Siphonophorse, Disco- 

 phorse, Hydroids, Anthophoridee.) 



CL. 14. RHIZOPODS. Only the genera mentioned. 



CL. 15. INFUSORIA. Only genera and families mentioned. 



Van Beneden thinks the classification of Linnaeus truer 

 to nature than either that of Cuvier or of De Blainville, 

 as the class of Worms of the Swedish naturalist corre- 

 sponds to his Allocotylcdones, that of Insects to his Hypo- 



