FEOJVI THE TEIAS OF LOMBAEDT. 



III. Sauroptertgia. 



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

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

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

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

 transverse processes ; cervical vertebras 20 to 72 ; sacral vertebras 1 or 2 l . 



Three families : — 



1. Pliosaurid^;. — No median prolongation of the scapulas and coracoids, which are widely sepa- 

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

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



2. Plesiosaurid.e. — Scapulas separated on the middle line; coracoids with median anterior 

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

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



3. ElasmosauridvK. — Scapulas 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 vertebras 35 to 72, with single- headed ribs. Propodial bones much modified, 

 simulating mesopodials. 



Beferences to the Literature on Nothosaurians. 



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



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



2. MCnster, 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 Palasosauri. 



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

 p. 246. 



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 



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



6. Meyer, H. von, and Plieninger, J. Beitriige zur Palasontologie 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. Curioni, 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. Oste"ographie. Publication posthume. Eeptiles. Paris, 1855, fol. 



1 This character should prohably 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 vertebras in Cryptoclidus. [June, 1895.] 



vol. xiv. — part i. No. 2. — April, 1896. c 



