GYMNOSOMATA. 121 



Order II. GYMNOSO'MATA, De BlainviUe. 



BOBY naked or not having a shell : head distinct : gills 

 external. 



The only member of this order which seems to have 

 been observed on the British coasts is Clione papilio- 

 nacea of Pallas (Clio borealis, Bruguiere = Clio retusa, 

 Miiller and Fabricius), a native of the Arctic Seas, and 

 partly the reputed food of the true whale. Dr. Leach 

 says that during a tour to the Orkneys (query He- 

 brides?) in 1811 he found several mutilated speci- 

 mens on the rocks, and succeeded in capturing one 

 alive while rowing along the coast of Mull. Dr. 

 Morch reminds me that in the f lsis' for 1823 (ii. 

 p. 459) Oken mentions a specimen in the Museum of 

 the Jardin des Plantes from Falmouth, and that Faber 

 noticed this mollusk as found in the Cattegat at Lesso. 

 This latter statement may have been the authority for 

 the locality given by Loven in his ' Index/ 



Class CEPHALO'PODA*, (CEPHALO- 

 PODES) Cuvier. 



BODY cylindrical or oval, fleshy, covered with pigment-spots 

 (chromatophores): mantle pouch -like, in some kinds expanded 

 on each side into a fin or lobe, and in every kind forming 

 above in the middle of the ventral area a pipe or inverted fun- 

 nel, analogous to the fold in the Siphonobranchiate Gastropods : 

 tentacles, in the Decapods, 2, long, flexible, contractile, and 

 armed with cup-shaped suckers (acetabula) on the inner side, 

 and usually only on that part, of their club-shaped extremities ; 

 in Nautilus they are numerous, short, and unarmed : head 

 large and distinct : mouth circular, with a muscular lip : jaws 



* From the head being surrounded by feet. 

 VOL. V. G 



