200 CLASS VI. 
Stephanoceros EHRENB. Body campanulate, surrounded by a 
transparent vagina. Tentacles five around the mouth, covered with 
cilia in whorls. 
Sp. Stephanoceros Hichhorniti EurEens., Der Kron-Polyp Exouu. |. eas ane 
fig. 1; EHRENB. Organis in d. Richt. d. kl. Raum. 3lter Beitrag, Tab. Xi. 
fig. 1, Infusionsth. Tab. Xtv. fig. 2. 
Family II. Melicertina. Rotatory organ simple, with margin 
entire or lobate. 'T'wo stapediform maxille, with teeth transversely 
incumbent. Body affixed by a pedicle. . 
Ptygura Dusarp. (Ptygura, Gicistes, Conochirus EHRENB.) 
Lacinularia OKEN, Scuwerac. (Megalotrocha Eur. and Laci- 
lunaria ejusd.) Rotatory organ large, incised on one side, hence 
bilobed or reniform. Animals often social, and sometimes covered 
by a gelatinous envelope. | 
Sp. Lacinwaria socialis ScuwEiac., Hydra socialis L., Brachionus socialis 
' Paur., Vorticella socialis Munut., Infusor. Tab. xu. figs. 13—15, (and 
Vortic. flosculosa MUELL. ibid. figs. 16—20), Rasen, Jns. 11. Supp. Tab. 
94, figs. 1-6; Exrens. Infusionsth. Tab. xutv. fig. 4. They form 
minute, white, conical bodies, which adhere to the roots of water-plants 
(Lemna, Ceratophyllum, Chara, &e.), and consist of fifty or more such 
wheel-animalcules, whose extremities are all directed to the centre. After 
a time the young ones separate themselves from this connexion, move 
away and adhere to different plants, to form new colonies. Megalotrocha 
albo-flavicans Eur., Rasen Jns. 11. Suppl. Tab. 95, 96, (Megalotr. alba 
Eunrens., Zur Erkenntniss d. Organis. in der Richtung des kleinsten Raumes. 
ater Beitrag, Tab. 11. f. 15, intestinal canal), Eur. Infusionsth. Tab. XLtv. 
fig. 3, is distinguished from the former species by the absence of an 
envelope, though united with it by former writers. 
Tubicolaria LAM. (in part), EHreNB. Body clavate, with rota- 
tory organ four-lobed, and respiratory tube double, included im a 
gelatinous vagina. 
Sp. Tubicolaria najas EHRENB., Rotifer albo-vestitus DuTROCHET, Ann. du 
Mus. Vol. x1x. Pl. 18, figs.9, 10; EnRENB. Jnfusionsth. Tab. XLv. fig. 1. 
Melicerta SCHRANK, OKEN. Body clavate, with rotatory organ 
four-lobed, and double respiratory tube, retractile within a vagina 
conico-tubular, granulose, opaque. Two ocelli in the younger age. 
Sp. Melicerta ringens ScHRANK, Sabella ringens L., Syst. nat. éd. x11. LEEU- 
WENHOECK, Phil. Transact. 1704, Vol. XIV. p. 1784, figs. 3, 4 ; Sendbrieven, 
Delft, 1718, vi1e. Brief, bl. 63, &c.; ScHmrreR Die Blumenpolypen der 
siissen Wasser. Mit 3 Kupfert. Regensburg, 1755, 4to; Rotifer quadricir- 
