Miscellanea Zoologica. 63 



2. Pi.ATYPELTis, FiTZ. Os ccrvicale 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. 



t f Ossa costalia postica interpositis vertebralibus discreta. 



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 aucta: 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 metathoraci affixum : scuta 

 disci tredecim. 



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

 iiasus prominulus : mandibulae denticulatae : gnatotheca tribus parti- 

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



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

 nasus productus : 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 metathoraci 

 affixum : scuta disci quindecim. 



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



SUBFAMILIA 7. SPHARGIDINA. 



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



Scytina, Wagl. Dermatochelys, Fitz.) 



Testudo coriacea, Linn. Med. Atl. Pac. I . 



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

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

 III. 



Ill — The British Ariciad^. 

 The Annelidas, 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 



* Aim. des Sciences Nat. Vol. xxix. p. 888. 



