347 



tions as a ^common calcareous crust* and possibly the genus might be preserved 

 on account of this character. 



In his work on the British Zoophytes Johnston gives Fabricius as the 

 author of the genus Cellepora, but the first author who used this name was in 

 reality Linne in the Xllth edition of his Systema Naturae, and the first species 

 he' refers to this genus is C. ramulosa. 



Genus Siniopelta n. g. 

 Cellepora Busk, Hincks, part.; Celleporella Hincks, part.; 

 Schismopora Mac Gillivray* part.; Osthimosia Jullien^ part. 



The endoocEcium has a flat frontal area furnished either with radiating fis- 

 sures or with pores and covered by a membranous part of the ectoooecium. 



To this genus belong C. Costazzi Aud., Celleporella pygmaea Norman (Cel. lepra- 

 lioides Norman), Cellepora Boryi Aud. ^ (Lekythopora Watersi Calvet*), Lagenipora 

 lucida Hincks, Cel. granum Hincks, C el. costal a Mac Gill.^ Cel. platalea Mac Gill.^ 

 Cel. rota Mac Gill.'', Cel. rudis Busk etc. 



The ocecia of Cell. Boryi ai-e not as Calvet states frontal but spring from 

 the distal rim of the aperture. The form of the peristome seems to be somewhat 

 variable. 



Family Holoporellidae n. f. 



Spines may appear in a number of 2—5. The aperture, which only rarely 

 has hinge-teeth, has a concave or almost straight proximal margin, which may 

 sometimes be provided with 2—6 extraopercular teeth of different form. The 

 operculum, which as a rule is weakly chitinized and often grades without bound- 

 ary into the compensation-sac, is frequently provided with a ridge-like projection 

 within each margin. A peristome may be absent or present, but is never strongly 

 developed. A more or less strongly projecting, obliquely placed avicularium occurs 

 as a rule proximally to the aperture, and large, scattered avicularia further often 

 appear. The ooecia, which only occur in a small number of species, are widely 

 open, consisting of a single calcareous layer, and in shape like a cap or bowl 

 without pores; they seem to have no. covering membrane. The zooecia in the 

 basal layer of the colony, which have a rectangular circumference, are provided 

 both on the distal wall and on the distal half of each lateral wall with a row 



1 76, p. 109. ' 45, p. 64. = 98, PI. 7, figs. 3,1-3,6. " 10, p. 68, PI. 2, figs. 10-13. » 61, p. 136. 

 « 68, p. 114. ' 68, p. 116.. 



