of the Order Edeniata. 359 



Conspectus Familiarumy Generum^ et Specieruniy Brutorum frondcs 



carpentium. 



pijDO — Bruta, LinnacuSj Fischer {Edentata^ Cuvier). 



Denies nulli ; aut radices, cerviccm, ct adamantum carcntcs. Ungues, 

 falculse raagnco, plemmquc vaginatse, deflectcntes. 



TbIBUS— PlIYLLOniAGA. 



Dentes pauci, c dentino vasculoso, dcntino duro ct ccemcnto compositi, 



dcntino vasculoso axem magnum formante. 

 Apophysis descendens in osse jugali. Acromion cum proccssu cora- 

 coideo-concretum. 

 Familia 1. — Tardigrada. (Syn. Scansoria, Bradypodidte.) 

 Pedes longi, graciles ; antici plus minusve longiores : manibus di-vcl 



tridactylis, podariis tridactylis ; digitis obvolutis, falculatis. 

 Arcus zygomaticus apertus. Cauda brevissima. 

 Genus 1. — Bradypus, Linn., Illig. (Syn. Acheus, F. Cuvier.) 

 Genus 2. — Choloepus, Illig. (Syn. Bradypus, F. Cuv.) 

 Familia 2. — Gravigrada. (Syn. Eradicatoria, Megatheriida;.) 



Pedes breves, fortissimi, sequales aut subsequales : manibus pcnla-vel 

 tetradactylis, podariis tetra-vel tridactylis ; digitis externis 1 aut 2, 

 muticis ad sufiultionem gressumque idoneis, reliquis falculatis. 

 Arcus zygomaticus clausus. Claviculse perfectse. Cauda mediocris, 

 crassa, fulciens. 

 Genus 1. — Megalonyx, Jefferson, Cuv. (Syn. Megatherium, Desm., 

 Fischer.) 



Dentes — subelliptici, coronide media excavatij marginibus praminulis. 



Pedes antici longiores. Tibia et fibula discret£B. Calcaneum longum, 

 compressum, altum. Falculse magnse, compressse. 



Species. — Megalonyx, JefFersoni, Cuv. (Syn. Megatherium Jeffersoni, 

 Desm., Fischer ; Megalonyx laqueatus, Harlan.* 



Genus 2. — Megatherium Cuv. (Syn. Bradypus, Pander et D'Alton.) 



Dentes — contigui, tetragoni, coronide transversim sulcata. Manus 



tetradactyli ; podarii tridactyli, digitis duobus externis muticis. Fal- 

 cula3 magnse, diversiformes ; medii digiti maxima), comprcssae. Femur 

 capite integro ; tibia cum fibula utraque extremitate concreta. Astra- 

 galus pagina antica supra excavata. Calcaneum longum, crassum. 

 Species. — Megatherium, Cuvieri, Desm. (Syn. Bradypus giganteus, 

 Pander et D'Alton.) 



* The species is founded on fossils from Big-bone Cave, Tenessee, described in 

 the Medical and Pliysical Researches, p. 319-3;?1. The author does not prove 

 the specific distinction of these remains from the Mcijalonyx Jeffersoni of Cuvier. 



