342 ESCHARTD^. 



Bihang, 12 and 92, pi. xxiv. fig. 63 ; Floridan Bryoz. pt. ii. 



60, pi. X. figs. 201,202*. 

 ? EscH.iRELLA PORiFERA, S^tiitt, forma MiNuscoLA and forma majuscula, 1. c. 



Krit. Forteckn. 9, 73, and 74, pi. xxiv. figs. 33-35 and 36-38. 

 Esciiarella pertusa, Smitt ( = £". porifera), CEfv. K. Vetensk.-Ak. Forh. 



1878, no. 3,21. 



Zooscia ovate or rhombic, or elongate and somewhat 

 rectangular, in linear series, alternate, separated by 

 raised lines ; walls thin and glassy, punctured round 

 the margin or over the entire surface ; primary orifice 

 suborbicular, or slightly sub quadrangular, a prominent 

 tooth within the lower margin, and a minute denticle 

 on each side of it; peristome raised, especially in the 

 fertile cells, thin, cleft in front into a narrow, spout- 

 like sinus, partially inclosing a small rounded avicula- 

 rium; below it usually a mamillary rising. Ocecia 

 globose or ovate, prominent, punctured, frequently a 

 large, raised, spatulate avicularium placed transversely 

 on each side or on one only. 



Colonies spreading in large subcircular patches, silvery 

 when fresh, and often of a reddish colour; or rising 

 into thin foliaceous expansions, " anastomosing irregu- 

 larly, and undulated on the margin/^ 



The erect form attains a height of .2 inches. 



Form a [crystallina, Norman) (Plate XXXVI. fig. 2) . 

 Zooecia small, lozenge-shaped, rather convex, not very 

 regularly arranged, surrounded by inconspicuous lines, 

 white and silvery, surface covered throughout with 

 round punctures; orifice (secondary) triangular, peri- 

 stome much raised at the sides, in front deeply cleft 

 into a channelled sinus, and immediately below it a 

 small aviculai'ium, with rounded mandible, pointing 

 downwards ; oral spines five (rarely present) ; a central 

 tooth on the lower (primary) margin and two lateral 

 denticles. Ocecia globose, prominent, punctured. 



Colonies foi'ming small silvery-white patches. 



* Of Smitt's figures of Escharella Landsborovii in his ' Catalogue,' only 

 one (fig. 63) seems to me referable to the present species. 



