FEOM THE TEIAS OP LOMBAEDT. 9" 



III. Saukopterygia. 



Clavicles small, if present, applied to the dorsal surface of the scapulse ; scapulse with much- 

 developed acromial process ; coracoids enormously developed, with their long axes parallel, tlieir 

 inner borders in contact. Limbs paddle-shaped, with the propodials more or less abbreviated, and 

 an increased number of phalanges. Vertebrae biplane or feebly biconcave; dorsals with long 

 transverse processes ; cervical vertebrae 20 to 72 ; sacral vertebrae 1 or 2 '. 



Three families : — 



1. PLIOSAURID.E. — No median prolongation of the scapulae and coracoids, which are widely sepa- 

 rated from each other on the median line, thus enclosing a single large foramen ; scapulae not 

 meeting in the middle. About 20 cervical vertebrae, with forked ribs. 



2. Plesiosaurid^. — Scapulae separated on the middle line; coracoids with median anterior 

 prolongation, meeting the interclavicle and clavicles ; the pectoral arch thus enclosing two 

 foramina. Cervical vertebrae 28 to 40, with forked ribs. 



3. ELASMosAURiDyE. — Scapulae extensively in contact with each other on the middle line, where 

 they join corresponding median processes of the coracoids ; the pectoral arch thus enclosing two 

 foramina. Cervical vertebrae 35 to 72, with single-headed ribs. Propodial bones much modified, 

 simulating mesopodials. 



Refeeences to the Literature on Nothosaubians. 



1. Meyer, H. von. Conchiosaurus elavatus, ein Saurus aus dem Muschelkalke von Bayreuth. 



Mus. Senckenb. i. 1834, pp. 8-14, pi. i. 



2. MtJNSTER, G. zu. Vorlaufige Nachricht iiber einige neue Reptilien im Muschelkalk von 



Baiern. N. Jahrb. Min. 1834, pp. 521-527. 



3. Balsamo-Crivelli, G. Descrizione di un nuovo rettile fossile, della famiglia dei Palaeosauri. 



II Politecnico (Milano), May No., 1839, p. 421.— Abstract in N. Jahrb. Min. 1843,. 

 p. 346. 



4. Braun, F. Verzeichniss der in der Kreis-Naturalien-Sammlung zu Bayreuth befindlichen 



Petrefakten. Leipzig, 1840, 4to. 



5. Meyer, H. von. Simosaurus, die Stumpfschnautze, ein Saurier aus dem Muschelkalke von 



Luiieville. N. Jahrb. Min. 1842, pp. 184-197. 



6. Meyer, H. von, and Plieninger, J. Beitrage zur Palaeontologie Wiirttembergs, enthaltend 



die fossile Wirbelthierreste aus den Triasgebilden. Stuttgart, 1844, 4to. 



7. Meyer, H. von. Zur Fauna der Vorwelt. Die Saurier des Muschelkalkes. Frankfort/M., 



1847-1855, fol. 



8. OuKioNi, G. Cenni sopra un nuovo Saurio fossile dei monti di Perledo sul Lario. Giorn, 



1st. Lomb. xvi. 1847, pp. 157-170, pi. — . 



9. Cornalia, E. Notizie zoologiche sul Pachypleura edwardsii, nuovo sauro acrodonte degli 



strati triasici di Lombardia. Giorn. 1st. Lomb. (2) vi. 1854, pp. 45-58, pis. i. & ii. 

 10. Blainville, H.M. D. DE. Ostfegraphie. Publication posthume. Reptiles. Paris, 1855, fol. 



' This character should probably be erased from the diagnosis. Mr. Andrews (Ann. & Mag. Nat. Hist. 6, 

 XV. 1895, p. 334) states that there appear to be three or four sacral vertebrae in Cryptoclidus. [June, 1895.] 



VOL. XIV. — PART I. No. 2. — April, 1896. c 



