26 F. A. SMITT, 



Escharipora stellata, n. sp. (Pl. VI, figs. 130— 133), 



Char.: Zooecia ovalia, planata, frontem calcificatione reticulatam, poris stellatis 

 pertusam prasbent; aperturam priraariam preebent semicircularera, secun- 

 dariam vero elevatam, transverse oblongam. Avicularia acuta, longirostria, 

 vulgo tria, aperturam zooecii muniunt, quorum duo, intus vergentia, ad 

 angulos illius aperturse proximales posita sunt, tertium vero avicularium, 

 quod interdum deest, proximaliter versum, ad medium marginem distalem 

 aperturse in apice zooecii locum tenet. 



Hab.: Hane speciem Pourtales cepit sat frequentem, Sertularias, Coralia, testas 

 obducentein e prof. 42— 183 org. 



In its young state, and particularly in the less deep regions of the sea, where it 

 seems usually not to be so mucb calcified as in the deep-water, almost the whole front 

 side of the zooecia is perforated by round, stellate pores, between which the wall, in 

 its advancing calcification, raises itself in a reticulated manner, whereby the pores appear 

 deeply immersed. The calcification, in going forth, raises the apertures of the zooecia, 

 giving them a narrower, transversely oblong shape, instead of their primarily semicircular 

 form, with a breadth of about 0,1 mm. At the same time, it raises the tip of the 

 avicularia, which all converge towards the zocecial aperture. In the harder calcification, 

 and, as usual, in the deep-water, the stellate pores are fewer, confined to the median 

 part of the front side of the zooecia, and, consequently, the ridges between them are 

 broader. At last, the pores lose their stellate appearance, and the summit of the ridges 

 then becomes slightly furrowed; these furrows, in their connection, giving a new reti- 

 culation to the surface of the zooecia. On the examined specimens, I never saw any 

 ocecion, were it not the more or less developed tumidness, distally of the zocecial aper- 

 ture, where the third avicularium, as usual, is placed. 



This species seems to be one of the more common ones among the Floridan 

 bryozoa. Pourtales has taken it from six different localities, at a depth varying from 

 42 to 183 fathoms. 



Porellina ciliata ') (Pl. VI, figs. 126—129). 



Of this species Pourtales has taken some very well developed colonies living at 

 various depths of from 7 to 60 fathoms, encrusting shells, corals etc. 



In its ordinary appearance, it perfectly agrees with the European and Arctic 

 form, and, particularly, through she shape of the zocecial aperture, with the Mediter- 

 ranean variety 2 ). The greatest breadth of that aperture here I have ineasured to about 

 0,n mm. 



One of the colonies (fig. 126) shows the manner of development from the flust- 

 rine type, the first (central) zooecion retaining the Tata-form with the primary area of 



x ) Syn. vide Porina ciliata, Krit. Fört., Öfvers. Vet. Akad. Förh., 1867. Bih., p. 6. 



Adde Reptoporellina subvulgaris, D'Orb., Pal. Franc, Terr. Gret., vol. V, p. 477. 

 2 ) Krit. Fört., 1. c., p. 62. 



