JAPANESE CHEILOSTOMATOUS BRYOZOA. 



6. Serupoeellaria avicwlarice, n. sp. 



Pl. VI., fig. 4 ; textfig. 4. 



Zoarium erect, dichotomously branching, forming a tufted growth 



30-40 mm. in height, glossy- 

 white. Internodes stiff, con- 

 sisting of from 5 to 16 or 

 more zoœcia. Joints bright 

 yellowish. Zoœcia arranged 

 alternately in two series, 

 elongate, widened above, 

 gradually narrowed below ; 

 their aperture oval, with 

 thin margin, unarmed, oc- 

 cupying more than half the 

 front. Scutum very large, 

 exceeding the orifice in 

 area, widened and raised 

 above, slightly narrowed 

 below, with irregular 

 vein-like sculpturing on 

 surface. Lateral avicularia 

 small, usually present on 

 every zoœcia, placed at 

 the upper outer angle on 

 the dorsal surface. Frontal 

 avicularia rounded, raised, 

 with short and broad 

 mandibles, present on all 

 zoœcia, placed on the inner 

 apertural margin a little 

 below the middle and at 



Fig. 4. Scrnpocellaria avicularia, n. sp. 



A. Portion of a branch in frontal view, showing 

 oœcia, frontal avicularia and operculum, x 4S. 



lî. Dorsal view of the bifurcating parts of a 

 branch, to show the position of vibracula and 

 the origin of rootlets, x 32. 



< '. Mandible of frontal avicularium. x 150. 



D. Mandible of lateral avicularium. x 150. 



E. Vibraculum. x 150. 

 E. Vibracular chamber, x 120. 



