40 F. A. SMITT, 



As I can find no better place for it, with the genus Gemellipora I conjoin a spe- 

 cies, whose outer appearance most strikingly reminds of the creeping state of Gemelli- 

 pora ebumea. 



Gemellipora limbata (Pl. XI, figs. 212—214). 



Char.: Zocecia repentia ovalia proximaliter in tubum producuntur, aperturam ro- 

 tundam (cujus diam. = 0,09 mm.) secundarie in tuba? formam erigunt. Ooecia sphasrica, 

 libera, crista transversa media, horizontali ornantur, lateri distali tubas secundaria? zo- 

 cecii apponuntur. 



Hab.: Coloniam hujus speciei, per Celleporam serpentem, e prof. 471 orgyarum 



SUStlllit POURTALES. 



The trumpet-shaped raising of the rounded secondary aperture and the narrow, 

 elongated, tubiform proximal part of the zooecia, when unworn, ovate for the rest, 

 very easily distinguish this species; but as the only specimen I have seen is dead, 

 without presenting any sign of the true primary aperture, it is hardly possible to say 

 anything about its true affinities. 



The following genus, nearest in accordance with D'Orbigny, I formerly character- 

 ized and named Mollia x ); but for the reasons given above, that name will be used, 

 more conveniently, for another group of a totally different constitution. Here, then, 

 we must seek for its substitution by another name, and, indeed, an old one, Hippothoa 2 ), 

 seems very well to be used in this sense. At its first constitution, by Lamoueoux, it 

 included only one species, Hippothoa divaricata, which I have shown 3 ) to be a variety 

 of the same type as Hippothoa (formerly Mollia) hyalina. 



In its generic character, of course, we must cast away the form of the colonial 

 growth, founcling it lipon the form of the zocecial aperture. From this genus, in my 

 former papers, I have separated, as a distinct genus, what I then named Myriozoum, 

 fouuded, essentially, upon a modification of the form of the median sinus; buf now, 

 as in the southern species I find this characteristic more nearly combined with the 

 typical form of the Hippothoan aperture, it seems to be the best to restore the name 

 of Myriozoum only to those species, which, in the form of the zooecial aperture, agree 

 with the southern, oldknown Myriozoum truncatum, using the name of Leieschara for 

 those species, which in the shape of the zooecial aperture agree with the Hippothoa, 

 while the great development of their cancellation places them in the nearest relation 

 to the Myriozoum. The genus Hippothoa, then, will be characterised: 



Zooecia incancellata aperturam semiellipticam vel semicircularem margine proximali 

 recto medio sinuatam prasbent. Avicularia mediana desunt 4 ). 



!) Öfvers. Vet. Akad. Förli., 1867, Bill., pag. 14. 



2 ) Lmrx. 1821, Expos. Méth., pag. 82. 



3 ) Öfvers. Vet. Akad. Förh., 18G7, Bih., pag. 112. 



4 J This is almost the same character as that for my subdivisiou marked C among the Myriozoida (1. c. p. 14). 



