NATURAL HISTORY. xcix 



X X, systemic sinuses; y, systemic ventricle; z, aortae; 1 1, ovisacs in the ovary 

 appended to filamentary pedicles ; 2 2, ova in the oviduct ; 3 3, glands which secrete 

 the nidamentum, or connecting substance of the ova. 



R. 0." 



PTEROPODA. 

 2.— CLIO BOREALIS. 



CLIO BOREALIS. — Cuv ; Rig. Anim. — vol. iii., p. 27. Lamarck — vol. vi., p. 286. 

 CLIO LIMACINA.— P/(i>;)S, Ellis Zonph.—^. 15, figs. 9 and 10. 



Leach, Ross's Voyage — oct. edit., vol. ii. p. 172. 

 Sab: Supp. to Parry's 1st Voyage — p. ccxxxix. 



Ross, App. to Parry's 3d Voy. — p. 120 ; and Parry's Polar Voy. — p. 206. 

 CLIO RETU SA— i^aft: Faun. Grcenl.—^. 3ZA. 

 CLIONE PAPILIONACEA.— Pa//as, Spicil. Zoo/.— vol. x., p. 37, pi. 1, figs. 18 and 19. 



Very numerous in most parts of the Arctic Ocean. Less abundant in Regent's 

 Inlet and the Gulf of Boothia. 



3.— LIMACINA ARCTICA. 



LIMACINA ARCTICA.— Cuy; iZf^. ^nim.— vol. iii., p. 28. 

 Lamarck — vol. vi., p. 290. 

 Leach, Ross's Voyage — oct. edit., vol. ii., p. 172. 

 Sab : Supp. to Parry's \st Voyage — p. ccxxxix. 



Ross, App. to Parry's 3d Voyage — p. 120. Parry's Polar Voyage — p. 206. 

 ARGONAUTA ARCTICA.— ii'ai ; Faun. Grcenl.—p. 386. 



A very abundant species; peopling as it were the Polar Seas, and constituting the 

 chief source of subsistence to the Greenland whale. It is indeed most truly won- 

 derful that so small and apparently insignificant an animal can be made to fulfil the 

 most important purposes ; from the smallest species of Crustacea to the enormous 

 whale, all derive their food directly or indirectly from this little creature. It is in fact 



*N 2 



