. i8 



gg. Dwelling in a transparent tube ; body without opaque warts or 

 denticles ; corona heart-shaped and long axis dorso-ventral ; 

 antennse inconspicuous. Lacinularia. 



ff. Free swimming colonies or clusters (fig. 9). Conochiltis. 



ee. Individuals attached, or separate, or in branching non-spherical 

 colonies of few individuals (i to 30) ; or not attached, inhabiting 

 a tube, 

 f. Not attached, inhabiting a tube ; individuals separate or with young 

 (fig. 9). Conochilus sp. 



ff. Attached, separated, or in branching colonies of one to 30 individ- 

 uals, 

 g. Corona of 3 or 4 lobes, ventral antennae obvious, dorsal antennee 

 minute (fig. 8). Melicerta. 



gg. Corona of not more than two lobes, 

 h. Corona broad, of two lobes, with a wide dorsal gap ; dorsal 

 antennse present ; minute ventral antennae ; tube without 

 pellets. Liiiitiias. 



hh. Corona nearly circular or indistinctly two lobed. 

 i. Dorsal antenna very large, with two projections or hooks at its 

 sides ; ventral antennae small or absent. Cephalosiphon. 



ii. Dorsal antenna inconspicuous or absent ; ventral antennae 

 obvious ; dorsal gap minute. Oecistes. 



cc. Corona without setae and with at most a minute ciliary wreath. 



ApSIIvID^. 



d. Corona with one dorsal lobe ; body long. Acyclns. 



dd. Coronal cup a large membranous .sack ; body short and thick ; no 

 foot, but a disk (fig. 7). Apsiliis. 



bb. Not fixed when adult, and but rarely living in a tube in which case is 

 not attached by its foot to the bottom of the tube, 

 c. Body bearing swimming or skipping appendages, in the form of mov- 

 able spines or blades, no foot, uo armor (fig. 41). 



vSCIRTOPODA, Pedawonid.^J, Genus Pedaliou. 



cc. Foot usuall)' present. 



d. Without an unyielding armor, that is, the cuticle of the animal is 



flexible. IIJvORICATA. 



e. Foot ending in a single pointed toe, or with two projections not side 



by side, but one ventral and one dorsal, and corona a circle of 



strong cilia, mouth in the center, form of body conical ; one eye. 



MlCROCODONID.^. 



f. Foot narrow stillette form ; corona heart shaped ; cingulum dor- 

 sally and ventrally slightly interrupted ; brain purple ; always 

 with an accessory claw at the base of the toe (fig. 12). Microdot!. 

 Compare Notoiniiiata monopus with reddish body and Albertia 

 naidis which is eyeless, 

 ff . Foot shorter and broader ; corona circular, without interrujition ; 

 brain not purple. Microcodides. 



ee. Foot absent, or present and with two toes, or otherwise different 

 (If without foot, and spherical in form and with a ciliary wreath 

 see Trochosphaera solstitia/is. ) 



