510 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



examination of the young zooccia. In most of the species of Galeopsidae the spira- 

 men, if it be in rapport with the hydrostatic system, might have another use. another 

 function, unfortunately still unknown. It is not possible, for example, to compare 

 the size of the spiramen of Galeopsis with the smallness of the orifice of the com- 

 pensatrix simply closed by a rimule or by a poster of an operculum. On the other 

 hand, it is quite frequent to find on the same zoarium some zooecia deprived of 

 spiramen and which nevertheless are still living and contain a polypide. 



In the family of the Tessaradomidae Jullien. 1903, the spiramen opens into 

 the peristomie just at the level of the operculum; exteriorly it is placed much lower, 



always eccentrically and may be confused with the 

 ascopore of the Acroporidae. 



We have no knowledge of the larva of the Gale- 

 opsidae and Tessaradomidae, and we think that it 

 is preferable to unite them provisionally in a single 

 family; the distance of the spiramen from the oper- 

 culum does not seem to us a character sufficient to 

 influence the larval system. 



In the species with thick frontal the tubules cover 

 the ovicell, which becomes invisible exteriorly; the 

 sections permit of their discovery in the vicinity of 

 the zoarial axis. 



Genus GALEOPSIS Jullien, 1903. 



1903. Galeopsis JULLIEN. Bryozoa provenant cles Cam- 

 pagnes de VHirondellc, p. 94 



The spiramen is very large and salient. The 

 apertura has two cardelles. The frontal is a tremo- 

 cyst or an olocyst. 



Genotype. Galeopsis 'rabidus Jullien, 1903. 

 Range. Maestrichtian Recent. 

 The nature of the frontal is not always evident 

 in this genus. As we have not been successful with 

 our tangential sections, we have accepted the genus 

 as it was defined by its author. 

 The known fossil species of this genus are: 



Galeopsis, new species. Cretaceous (Vincentown), Xew Jersey and Delaware. 

 (liilropsis (Eschara) heterostoma Reuss, 1869. Priabonian. 

 Galeopsis (Eschara) duplicata Reuss, 1869. Priabonian. 

 t't'ti'opsis (Porina) cribrana MacGillivray, 1895. Miocene of Australia. 

 Galeopsis (Porina) tuberculosa Maplestone, 1902. Miocene of Australia. 

 Galeopsis (Porina) columnata AVaters, 1881. Miocene of New Zealand. 

 /fi, new species, Plaisancian of England (Collection, Canu). 



FIG. 146. Genus Schizotheca 



Hincks, 1877. 



SchizothccaJissaEusk, 1858. Zooe- 

 cia, X 45, with and without ovicell. 

 (After Hincks, 1880.) 



