200 CLASS VI. 



Stephanoceros EHRENB. Body campanulate, surrounded by a 

 transparent vagina. Tentacles five around the mouth, covered with 

 cilia in whorls. 



Sp. Stephanoceros Eichhornii EHRENB., Der Kron-Polyp EICHH. 1. 1. Tab. i. 

 fig. i ; EHKENB. Organis in d. Richt. d. Id. Raum. $tter Beitrag, Tab. xi. 

 fig. i, Infusionsth. Tab. XLV. fig. 2. 



Family II. Melicertina. Botatory organ simple, with margin 

 entire or lobate. Two stapediform maxillae, with teeth transversely 

 incumbent. Body affixed by a pedicle. 



Ptygura DuJARD. (Ptygura, (Ecistes, Conochirus EHRENB.) 



Lacinularia OKEN, SCHWEIGG. (Megalotrocha EHR. 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. Lacinularia socialis SCHWEIGG., Hydra socialis L., Brachionus socialis 

 PALL., Vorticella socialis MUELL., Infusor. Tab. XLIII. figs. 13 15, (and 

 Vortic. floscidosa MUELL. ibid. figs. 16 20), KCESEL, In*, in. Supp. Tab. 

 94, figs, i 6; EHEENB. Infusionsth. Tab. XLIV. fig. 4. They form 

 minute, white, conical bodies, which adhere to the roots of water-plants 

 (Lemna, CeratophyUum, Chara, &c.), 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 EHR., KOESEL Ins. in. Suppl. Tab. 95, 96, (Megalotr. alba 

 EHRENB., Zur Erkenntniss d. Organis. in der Richtung des Tdeinsten Raumes. 

 2ter Beitrag, Tab. in. f. 15, intestinal canal), EHR. Infusionsth. Tab. XLIV. 

 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 in a 

 gelatinous vagina. 



Sp. Tubicolaria najas EHRENB., Rotifer albo-vestitus DUTROCHET, Ann. du 

 Mus. Vol. xix. PI. 18, figs. 9, 10 ; EHRENB. Infusionsth. Tab. XLV. fig. i. 



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. ed. xn. LEEU- 

 WENHOECK, Phil. Transact. 1704, Vol. xiv. p. 1784, figs. 3, 4 ; Sendbrieven, 

 Delft, 1718, vii e . Brief, bl. 63, &c. ; SCH^EFFER Die Blumenpolypen der 

 siissen Wasser. Mit 3 Kupfert. Eegensburg, 1755, 4to; Rotifer quadricir- 



