78 Rev. T. Hincks's Contributions towards 



The appendages placed one on eacli side below the orifice 

 are described as avicularia by Heller; but Manzoni states 

 that they are really vibracula. They do not occur in a perfect 

 condition on any of the Madeiran examples ; but, from the 

 appearance which they present, I should infer that the latter 

 is the correct view of them. 



On the whole, I am inclined to regard the present form as 

 a rather strongly marked variety of Heller's L. Kirchen- 

 paueri. It seems to bear a close relationship to Escharella 

 setigera, Smitt (Floridan Bryozoa, pt. 2, p. 58, pi. x. 

 fig.' 206). 



The following are referable to the genus Lepralia, as 

 limited by Smitt: — L.foliacea, Pallasiana, adpressa, hippopus, 

 edax, and (with less certainty) pertusa and polita (all British) ; 

 lata, Busk (probably identical with adpressa) , Kirchenpaueri, 

 Heller (Adriatic), Poissonii, Audouin, inornata, Smitt, 

 cleidostoma, id., turrita, id. (Florida), depressa, Busk (iEgean 

 sea). I should also feel inclined to rank with the foregoing 

 the following Floridan species, which are placed by Smitt 

 in his genus Escharella, viz. E. Audouinii, rostrigera, and 

 setigera (see Flor. Bryozoa, pt. 2, figs. 56-58). 



PORELLA, Gray. 



Porella nitidissima, n. sp. (PI. X. fig. 2.) 



Zocecia depressed, disposed in linear series, rectangular, 

 bounded by raised lines ; a row of large foramina round 

 the margin, surface punctured and with nodulous ridges, 

 crystalline and lustrous ; orifice not raised, arched and ex- 

 panded above, contracted below, inferior margin straight, 

 frequently a swelling under it ; a round avicularium within 

 it. On each side of the orifice, immediately above the lower 

 mai'gin, a small oval avicularium, placed on a prominence and 

 encroaching on the mouth, so as to give it a trifoliate appear- 

 ance. Ocecium depressed, half immersed, roughened or granu- 

 lous. 



Loc. Madeira (J. Y. J.). 



The real shape of the orifice in this species is masked by the 

 two lateral avicularia, which project over it, one on each side, 

 and make it appear distinctly trifoliate. Before their develop- 

 ment it presents the characteristic form of the genus, such as 

 avc have it in P. concinna, Busk. The surface of the zooecium 

 is much depressed and very bright and glossy. There are 

 frequently nodulous processes on the ovicell. 



Five British species of this genus have been described. 



