— 426 — 



ISehismatobraiiehia Gray. contin. 



Quintus ordo Cryptobranchiorum. Unicum genus : 

 Haliolis. 

 = Aristerobranchia Desh. 



Schismohrancliia (Chisniobranches) Blainv. olim 1817. 



Dict. sc. nat. tom. 8. p. 601. 

 Etym. oxiCo), scindo; ^Qccyxicc, branchiae. 

 Cephalophororuin ordo. Familiae : Megastoma, Hemi- 

 cyclostoma, Cyclostoma, Goniostoma. 

 = Adelobranchia Dum. 

 Schismobrancltia (Chismobranches Blainv.) Feruss. 1821. 

 Tabl. syst. p. XXXVII. 

 Primus subordo Cyclobranchiorum. Unica familia: 



Patellae. 

 Menke olim 1828. Syn. p. 53. — Chismobran- 

 chiata — familia: Patellaceae. 

 = Retifera Blainv. 



Schismobranchiata (male C h i s m o b r a n c h i a t a) Blainv. 

 1824. Dict. sc. nat. tom. 32. p. 258. et 1825. 

 Malac. p. 466. Cf. Sow. jun. Conch. Man. ed. 2a 

 p. 105. 

 Secundus ordo Paracephalophororum monoecorum 

 non symmetricorum. Genera : Coriocella, Sigare- 

 tus, Cryptostoma, Oxynoe, Stomatella, Velutina. 

 = Adeloderma Fer. 



Schismobrancliia (male Chismobranchia) Bisso 1826. 

 Hist. IV. p. 100. 

 Quintus ordo Gasteropodum. Familiae: Paludinidae, 

 Cyclostomadae. 



? Schiismotrema vid. Chimotrema. 



ISchizodesma Gray 1837 in Loudon's Mag. New Ser. I. 



p. 370. * > Wiegm. Arch. 1838. I. p. 86. 

 Etym. o%iC,o)y scindo; diof-ia, ligamentum. 

 Subgenus Mactrae. Typus: Mactra corallina Gm. 



Pariter Swains. 1840. Malac. p. 368. 



