96 CLIID-iE. 



Order GYMNOSOMATA. 



Animal naked, without mantle or shell; head distinct; fins 

 attached to the sides of the neck, without intermediate lobe ; 

 gills indistinct (Clio), or distinct (Pneumodermon) ; teeth 

 numerous. 



The embryos are at first Thecosomous, having a straight shell, 

 ovoid at the extremity ; thej swim by means of a ciliated velum ; 

 subsequently, they lose the shell, and the body is encircled by 

 rings of cilise (xx, 53, 55), which in turn disappear as the animal 

 assumes its perfect form. 



Family CLIID^. 



Body fusiform ; head with tentacles often supporting suckers ; 

 foot small, but distinct, consisting of a central and posterior 

 lobe. 



Clio (L.), Miiller, 111&. 



JEtym. — Clio J a sea-nymph. Syn. — Clione, Pallas, 17*14. 



Distr. — 10 sp. Arctic and Antarctic Seas, Norway, Mediter- 

 ranean, India. 



Head with two eye-tubercles and two simple tentacula ; mouth 

 with lateral lobes, each supporting two or three conical retractile 

 processes, furnished with numerous microscopic suckers ; fins 

 ovate; foot lobed. Dentition 12'1'12. In swimming, the Clio 

 brings the ends of its fins almost in contact, first above and 

 then below ( Scoresby). 



(7. borealis (xlii. 2, 5) is largely the food of whales; the Clio 

 and other pelagic animals are attracted to the large bodies of 

 Diatomacese which discolor the Arctic seas, and on which they 

 feed. The whale in turn lives upon them, and whalers hail the 

 appearance of these discolored patches of ocean-surface as indic- 

 ative of a good oil-harvest. 



CLiODiTA, Quoy and Gaimard. Head supported on a narrow 

 neck ; tentacles indistinct. 4 sp. Cape, Amboyna. G. fusiformis. 



Clionopsis. Troschel. 



Disfr. — G. Krohnii, Troscli. (xlii, 26). Mediterranean Sea. 



Body ovate, head keeled, mouth armed with three jaws; two 

 lateral tentacles ; fins two, oblong, lateral, anterior, with a trun- 

 cate intermediate lobe ; a ciliated ring around the hinder part of 

 the bod3^ 



The ciliated ring around the base of the head, and similar ring 

 around the middle of the body, seen in Trichocyclus (Pneumo- 

 dermon), are wanting in this genus. 



Pneumodermon, Cuvier, 1804. 

 Etym. — Pneumon, lung (or gill), derma, skin. 



