Miscellanea Zoologica. 63 



2. Platypeltis, Fitz. Os cervicale vertebralibus conjunctum, in medio 

 tantum rugosum. Testudo ferox, Gm. Am. s. 2. 



3. Pelodiscus, Fitz. Os cervicale a vertebralibus separatum, in medio 

 tantum rugosum. Aspidonectes Sinensis, Weigm. As. or. 1. 



f f Ossa costalia postica interpositis vertebralibus discrete. 



4. Amyda, Fitz. Os cervicale a vertebralibus separatum, in medio tan- 

 tum rugosum. Trionyx subplanus, Geoffr. As. m. 2. 



23. Trionyx, Wagl. (Emyda, Gray. Bell. Cryptopus, Dum.) 



Testa ossiculis marginalibus ancta : sternum latum, lateribus 

 valvis munitum : pedes retractiles. 



Testudo granosa, Schoepf. As. m. Afr. 2. 



FAMILIA III. CHELONIDAE. 



SUBFAMILIA 6. CHELONINA. 



24. Chelonia, Brongn. (Caretta, Merr.) Sternum latum, scutis 



tredecim scutello intergulari, ope scutorum humeralium, pecto- 

 raliura, abdominalium et femoralium metathoraei affixum : scuta 

 disci tredecim. 



1. Chelonia, Nob. (Ckelonees /ranches, Dum.) Scuta disci postposita : 

 nasus prominulus : mandibulae denticulatae : gnatotheca tribus parti- 

 bus constans. Testudo mydas, Linn. Atl. Pac. 3. 



2. Caretta, Nob. ( Chelonees imbriquees, Dum. ) Scuta disci imbricata : 

 nasus produetus : mandibulae integrae : gnatotheca individua. 



Testudo imbricata, Linn. Atl. Pac. 1. 



25. Thalassochelys, Fitz. (Chelonees Caouanes, Dum.) Ster- 



num angustum, scutis duodecim sine scutello intergulari, ope 

 scutorum pectoralium, abdominalium et femoralium metathoraei 

 affixum : scuta disci quindecim. 



Testudo caretta, Linn. Med. Atl. Pac. 1. 



SUBFAMILIA 7. SPHARGIDINA. 



26. Sphargis, Merr. (Coriudo, Flem. Dermochelys, Blainv. 



Scytina, Wagl. Dermatochelys, Fitz.) 



Testudo coriacea, Linn. Med. Ad. Pac. 1. 



V. — Miscellanea Zoologica. By George Johnston, M. D. Fel- 

 low of the Royal College of Surgeons of Edinburgh. Plates II. 

 III. 



III. — The British Ariciae^e. 

 The Annelides, say MM. Audouin and Milne-Edwards,* 

 which we group round the genus Aricia of Savigny, and of which 

 we form the fifth family in the order Errantes, present very con- 

 siderable dissimilarities in their external structure, — a circumstance 



* Ann. des Sciences Nat. Vol. xxix. p. 388. 



