1*^^^] liohevtson. — Incrustiiig Bnjozoa. 301 



I'orclla coHciinia is usually described as having the front wall 

 granulai-. In his report from the Queen Charlotte Islands, 

 Ilincks finds this species punctate as is that occurring in our col- 

 lection, dredged at 32 fathoms near San Pedro, California. 



Escharoides Smitt. 



Escharoides Smitt, 1867. 

 Escliaropsis Verrill, 1879. 

 Escharoides, Hineks, 1880. 



Zoarium erect, ramose. Zooecia with primary orifice subor- 

 bicular; peristome arched above, with a sinus below within which 

 an avicularium is inclosed. 



70. Escharoides sarsi Smitt. 



PI. 22, figs. 66, 67. 



Escharoides Sarsii Smitt, 1867, p. 24, pi. 26, figs. 147-154. 



Escharopsis lobata, Verrill, 1879, p. 196. 



Escharoides Sarsii, Hineks, 1888, vol. 1, p. 218, pi. 14, fig. 1. 



Zoarium partly inerusting, partly forming an erect foliaceous 

 expansion 100 mm. in height, composed of contorted, anastomos- 

 ing two-layered lamina^. Zocecia elongated, alternate, in the 

 young stage convex, smooth, and perforated round the margin ; 

 orifice orbicular, simple (pi. 22, fig. 66) ; in older stages, as cal- 

 cification proceeds, the front wall flattens, other pores develop in 

 the new outer layer, fewer and larger ones on the margin appear, 

 and others scattered over the front of the zooecium (fig. 67) ; 

 secondary orifice, with a well marked sinus; between these two 

 stages an intermediate stage in which an avicularium is found 

 upon one side of the orifice just within the margin. In older 

 parts of colony this hidden under the thickened calcified crust. 

 Ooeciaf 



A large colony growing over a clam shell obtained at Juneau. 



Smittia Ilincks. 



Berenicia (part) Johnston, 1847. 

 Lepralia (part) Johnston, 1847. 

 LepraJia (part), Busk, 1854. 

 Escharella Smitt, 1873. 

 Smittia Hineks, 1879. 



