482 LICHENOPORIDjE. 



Zoarium erect, rising from an irregular, incrusting porous 

 base, more or less stalked and cylindrical below, simple 

 or lobed, sometimes distinctly branched, sometimes 

 merely proliferous, and bearing clusters of expanded 

 lobes, on which the celliferous rays are disposed. Zocecia 

 bi- or triserial, vertical, minutely punctate, united so as 

 to form much elevated, radiating or lamellate rows on 

 the extremity of the lobe, which presents a stellate ap- 

 pearance; general surface of the zoarium completely 

 covered with somewhat hexagonal pores. Ooecia elon- 

 gate irregular inflations, formed of a minutely gra- 

 nulated calcareous crust, and situated on or near the 

 border of the stellate capitula, the " orifice short and 

 round, and variously placed " (Smitt] . 



Polypide with 8 long tentacles. 



THIS very beautiful and characteristic species has long 

 been well known, and has been accurately described by 

 various authors, by none more fully or graphically than 

 by the elder Sars. Much confusion, however, has been 

 introduced into the synonymy by Johnston's mistaken 

 identification of it with the Tubulipora truncata of Jame- 

 son and Forbes. It was first described by Fleming under 

 the latter (specific) name, which Jameson, however, had 

 previously applied to a totally different form. Johnston, 

 assuming the identity of the species which these authors 

 had in view (he had probably only specimens of Jameson's 

 species before him), ranked the Millepora truncata of the 

 latter and the Tubulipora truncata of Fleming as synony- 

 mous ; and the error has pervaded our systematic literature 

 to this day. The species which Jameson originally dis- 

 covered, and which Edward Forbes supplied to Dr. John- 

 ston, has been lost sight of; Fleming's species, in usurp- 

 ing its name, has supplanted it. 



We are indebted to Mr. Peach's sagacity for its resto- 

 ration. He recognized the existence of two distinct forms, 



