184 MTJLTICLAUSA. 



Suborder DACTYLETHRATA. 



Diagnosis. Cyelostomata in which the normal zooecia are 

 elongate, simple tubes, of the same general character as those of 

 the Tubuliporidae. Dimorphism occurs, and the zoarium consists 

 of normal zooecia, separated by numerous dactylethrso, which often 

 form the major part of the zoarium. Zoarium usually large and 

 complex. 



Family CLAUSHLE, D'Orbigny, em. 



SYNONYMY : 



Clausidce, pars, D'Orbigny. 

 Tubuliporidce, pars, Haime. 

 Idmoniidce, pars, Marsson. 



Diagnosis. Cyelostomata Dactylethrata with a stout, branching 

 zoarium. The zocecia open on all sides of the zoarium. The 

 dactylethrse are collected into zones, or are scattered regularly or 

 irregularly among the zooecia. 



MULTICLAUSA, D'Orbigny, 1852. 

 [D'Orbigny. Pal. franc,. Terr. cret. t. v. p. 899.] 



Diagnosis. Clausidae in which the zoarium is thick and 

 arborescent. The apertures occur irregularly or quincuncially 

 scattered over the surface of the zoarium. Dactylethra3 very 

 numerous. 



Type species. M. compressa, D'Orbigny, 1852. 



Affinities. D'Orbigny's type species has the apertures arranged 

 quincuncially, but in the case of the Clausidae it does not seem 

 necessary to place the regular and irregular forms in different genera. 



1. Multiclausa haimei, Gregory, 1896. 



SYNONYMY : 

 Multiclausa haimei, Gregory, 1896, Rev. pt. vi. : Ann. Mag. Nat. Hist. ser. 6, 



vol. xvii. p. 291. 

 Berenicea lucensis, Haime, 1854, Bry. jurass. : Mem. Soc. geoL France, ser. 2, 



t. v. p. 180, pi. vii. fig. 4. 



