56 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. . 



TRIPHYLLOZOON, new genus. 



{Trlphyllon, trifoliate, alluding to the trifoliate ovicell.) 



" The ovicell has a ' trifoliate stigma.' There is generally a minute 

 avicularium on the lip to one side. The opercula generally are fairly 

 similar with a nearly straight proximal edge, and in shape rather 

 wider than long, v^ ith the muscular attachments rather high up and 

 near the border. Apparently all have the labial pore which is often 

 the end of a long tube opening into the zocecium ( = ascopore) proxi- 

 mally to the operculum" (Waters). 



Oenoti/pe. — Triphyllozoon {Retepora ) monUifenim ]Mac( Hlli vray, 

 18G0. Eecent. 



Genus RHYNCHOZOON Hincks, 1891. 



1881. Rhi/nrhopora Hincks, British Marine Polyzoa. p. 38.5, (Preoccupied, 

 replaced by Rhynchozoon in 1891.) 



" This genus seems to be characterized by the possession, of a more 

 or less well-developed sinus on the apertura, by its ovicell which has 

 an entire frontal surface, and is provided with an incomplete ooecial 

 cover, and by the possession of pore-chambers (dietella?.)" (Levin- 

 gen.) 



Genotype. — Rhynchozoon {LepraUa) hhpinosa Johnston, 1849. 

 Eecent. 



Genus SCHIZOTHECA Hmcks, 1877. 



1877. ScMsotheca Hincks, On British Polyzoa, pt. 2, Classification, Annals 

 Magazine Natural History (4), vol. 20. p. i"t28; 1880, British Marine 

 Polyzoa, p. 283. 



" Zooecia with a suborbicular primary orifice, the lower margin 

 sinuatecl; the secondary orifice raised, tubular, notched in front. 

 Ovicell terminal, with a fissure in the front w'all, never closed by the 

 operculum." 



Genotype. — Schizotheca {LepraUa) fissa Busk, 1856. Eecent. 



Levinsen classified this genus in the Eeteporidae, where we also 

 believe it better placed. 



Family GALEOPSIDAE Jullien, 1903. 



The ovicell is hyperstomial and opens into the peristomie above 

 the operculum. A spiramen introduces into the peristomie the wa- 

 ter destined afterwards for the compensatrix. 



In the family of the Adeonidae as in that of the Eeteporidae this 

 spiramen also exists; it is in evident relation Avith the hydrostatic 

 system; it might have another use, another function mifortunately 

 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 

 compensatrix simply closed by a rimule or by a poster of an oper- 



