750 SUMMARY OF CURRENT RESEARCHES RELATING TO 



FaM. 11. EUOHLANID^. 



Trochal disk rounded ; wreath in interrupted curves and clusters ; 

 trophi Bub-malleate or virgate ; lorica iu two parts, meeting in a 

 furrow, or entire with additional pieces : foot jointed, feebly retractile, 

 not telescopic or transversely wrinkled — furcate or stylate. 



OEDEE IV. SCIETOPODA. 



That swim with their ciliary wreath, and skip by means of hollow 

 limbs with internal locomotor muscles. 



Fam. 12. Pedalionid^. 



Trochal disk transverse ; wreath two marginal curves with mouth 

 between ; trophi malleo-ramate ; foot replaced by two posterior 

 ciliated processes. 



GENEEA.* 



1. Flosoulariad^ .. Floscularia, Stephanoceros. 



2. Meliceetad^ . . Melicerta, Limnias, CEcistes, Cephalosiphon, 



Lacinularia, Megalotrocha, ConocMlus. 



3. PniLODiNADiE .. Philodina, Rotifer, Callidina. 



4. Hydatinad^ .. Hydatina, Bhinops, 



5. SvNCH^TAD^ .. Synchceta, Polyarthra. 



6. NoTOMMATAD^ .. Notommata, Diglena, Furcularia, Scari- 



dium, Pleurotrocha, Distemma. 



7. Tkiarthrad^ .. Triarthra. 



8. AsPLANOHNAD^ .. Asplcinchna. 



9. Beachionid^ .. BracMonus, Noteus, AnurcBa, Sacculus. 



10. Pterodinad^ .. Pterodina, Pompholyx. 



11. EucHLANiD^ .. EucManis, Salpina, Diplax, Monnstyla, 



Colurus, Monura, Metopidia, Stephanops, 

 Monocerca, Mastigocerca, Dinocharis. 



12. Pedalionid^ .. Pedalion. 



Echinodermata. 



Constitution of Echinoderms.t — C. Viguier, after a reference to 

 the belief that Echinoderms are radiated animals, discusses the 

 view propounded by Duvernoy and forcibly enunciated by Hackel, 

 against which he has already raised some objections, and side by side 

 with which he now pits the doctrine of Perrier taught in his work 

 on ' Colonies Animales.' According to the view of Perrier, the Echino- 

 derm is indeed a colony, but, instead of being formed of five equiva- 

 lent individuals (antimeres), it consists of five reproductive individuals 

 grouped around a nutrient individual ; these may coalesce in various 

 proportions. All Asteroidea are fragile, and all enjoy the power of 



* " The principal ones ; several of Ehrenberg's are omitted for various reasons 

 that cannot here be detailed, and the genus Notommata, though tlie name is 

 retained, is here supposed to have lost a Targe number of Ehrenberg's species." 



t Comptes Rendus, xcviii. (1884) pp. 1451-3. 



