FL0R1DAN BRYOZOA. 45 



This species, by the just-named plate and the open, semicircular median sinus 

 of the zooscial aperture, with the genus Hippothoa, araong the Floridan Bryozoa, coru- 

 bines a series of forms of Celleporine constitution, in the same manner, as, in the 

 northern regions, the Hippothoa hyalina combines with it that group, which I have 

 conjoined under the collective name of Cellepora ramidosa. But before following that 

 continuation of the Myriozoidan type, it is more convenient here to account for a spe- 

 cies, which, through the character of its zooecial aperture, as it comes very near to 

 the Hippothoa Isabelleana, among the Floridan Bryozoa, in another way shows the mode 

 of connexion between the preceding species and that group, for which, as a subgeneric 

 division, in my former papers, I proposed to use the name Herentia. 



Hippothoa mucrovata (Pl. VIII, hg. 169). 



Char.: Zooecia ovalia, porösa, poris ad lineas margin ales prgesertim distinctis, pa- 

 rietem frontis in mucronis formam densant, cujus latera compressa margini secundario 

 aperturas continuantur, aperturam (cujus latitudo = 0,1 ] mm.) prasbent semiellipticam, 

 tuberculis (reliquiis setarum) 6 — 9 coronatam, secundarie valde deraersam, margine 

 proximali recto medio late sinuatam. Ooecia rotunda frontem in tuberculi obtusi 

 formam erigunt. 



Hab.: Colonias duas coloris rubri fragmento testas mortuae insidentes e prof. 29 

 orgyarum cepit Pourtales. 



The blood-red colour and the, relatively, härd calcification as well as the general 

 form of the zooecia, with their well developed mucro on the proximal part of the se- 

 condary raising of the aperture, at the first sight give this species the appearance of 

 one of the forms, which I have brought together ') under the collective name of Di- 

 scopora coccinea 2 ); but the median sinus of the proximal margin of the primary zooe- 

 cial aperture, the principal characteristic of the Myriozoidan type, places it at the side 

 of the preceding species. Still, this character, through the great breadth of that sinus, 

 is very niuch modified, as the straightness of the proximal margin, usually, is reduced 

 to its most lateral parts, although, in some zooecia, the sinus is to be found much 

 .smaller, than what shows the figure. 



The above-named raising of the front-side of the zooecia, as Avell as the obtusely 

 mucronate form of the ooecia, would induce the supposition, that this species might 

 be the same as the Flustra margaritifera, by Quoy and Gaimard s ), from the Falkland- 

 islands; but with the anibiguity of the description and figures, given by those authors, 

 it will be the best to follow Busk in using that synonyme for another species 4 ), of 

 antarctic origin, which seems to belong to the Discoporidan type. 



In my former papers, as, among the northern Bryozoa, i saw the old-known 

 Hippothoa (Lepralia) linearis, in the general form of the zooecia as well as in their 



1 ) Öfvers. Vet. Akiid. lörh. 1867, Bih., pp. 26 and 164. 



2 ) Compare also the Discopora (Lepralia) multispinata, Busk, Qnart. .Tonni. Micr. Se., n. ser., vol. 1, p. 78. 

 Zoopli., pl. XXXIL fig. 5 



3 ) Voij. de VUranie, Zool, p. 606, tab. 92, figs. 7 and *. 



4 ) Lepralia margaritifera, Brit. Mus. Cat. Polyz., p. 72, tab. Cl, figs. 5 and 6. 



