^'^'^^^ Robertson. — In crusting Bryozoa. 289 



58. Schizoporella hyalina (Linnaeus) Hincks. 



PI. 19, figs. 43, 44, 45. 



CcUepora hyalina Linua-us, 1766-1768, ed. 12, p. 1286. 

 Escharina personata Lamarck, 1856, ed. 2, vol. 2, p. 236. 

 Lepralia hyalina, Johnston, 1847, ed. 2, p. 301, pi. 54, fig. 1. 

 Bciytoscharella pcrsonata, d'Orbigny, 1850-52, p. 465. 

 Lepralia hyalina, Busk, 1854, pt. 2, p. 84, pi. 82, figs. 1, 2, 3; pi. 



95, figs. 3, 4, 5; pi. 101, figs. 1, 2. 

 Lepralia discreta, Busk, 1854, pt. 2, p. 85, pi. 1, figs. 3, 4. 

 Lepralia discreta, Busk, 1859, p. 52, pi. 5, fig. 1. 

 Lepralia hyalina var. conferta Busk, 1876, p. 117. 

 Schizoporella hyalina, Hincks, 1880, p. 271, pi. 18, figs. 8-10; pi. 



45, fig. 2. 

 Diazeuzia hyalina, Jullien, 1888, p. i. 29, pi. 4, figs. 1-4. 

 Diazeusia reticulans Jullien, 1888, p. i. 33, pi. 4, fig. 5. 

 Schizoporella hyalina, Robertson, 1900, p. 326. 



Zoaria forming delicate, one-layered, reticulated, circular in- 

 crustations on stems and fronds of seaweed ; or the zooecia piling 

 on top of each other in an irregular way, having much the ap- 

 pearance of CcUepora. Zooecia variously shaped; in the one- 

 layered condition (pi. 19, fig. 43), subcylindrical, elongated, dis- 

 tinct, disposed in radiating rows and separated by large punc- 

 tures, giving the whole colony a reticulated appearance; wall 

 thin, delicate, transparent, hyaline; again, the zooecia may be 

 shorter and more barrel-shaped (fig. 45) ; with wall more opaque, 

 thicker, white; crossed by transverse lines or ridges (fig. 44), 

 with sometimes a distinct, broad umbo (fig. 45, uvti.) just below 

 the orifice and partially hiding it; orifice often orbicular, wide, 

 without a sinus except as the denticles (fig. 45, d.) project- 

 ing on each side define a rather shallow sinus; again the orifice 

 may be large (fig. 44, or.) with or without a well marked sinus 

 s. ; peristome, if present, thin, only slightly elevated on the upper 

 margin. Ocecia large^ globose; in the more delicate, hyaline con- 

 dition (fig. 43) either imperforate, or with pores around the mar- 

 gin; in the form Avith transverse ridges (fig. 44), marked by cor- 

 responding circular ridges, pores few, scattered, sometimes an 

 umbo, iim., in the middle of the occeial wall; in the more opaque 

 variety, offcia (fig. 45) with scattered pores; ooecial zooecia usual- 

 h' smaller than the ordinarv ones. 



