366 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Genus EMBALLOTHECA Levinsen, 1909. 



T.I:I. Emballothcca LEVINSEN, Morphological and Systematic Studies on the Cheilostomatous 

 Bryozoa, p. 333. 



The ovicell is hyperstomial and opens above the aperture by a wide orifice which 

 the operculum may close when it opens the aperture. The aperture bears a concave 

 proximal border and a wide rounded rimule. The operculum has muscular attach- 

 ments near the border; that of the ovicelled zooecia is larger. The frontal and the 

 ovicell are covered by the same tremocyst with large pores surmounting a very finely 

 perforated olocyst. 



Genotype. Emballotheca (Eschara) quadrata MacGillivray, 1880. 



Rang e . Jack- 

 sonian-Kecent. 



The known recent 

 species of this genus 



are: 



Em ~b allo theca 



(Schizoporella) fur- 

 cata Busk, 1884. 



Emballothrca 

 (Eschara) quadrata 

 MacGillivray, 1880. 



E mb allo theca 

 (Lepralia] subii7i- 

 tiK'i-sd. MacGillivray, 

 1879. 



I *75 



D E,x23 



FIG. 109. Genus Emballotheca Levinseii, 1909. 



A-D. Emballotheca subimmersa MacGillivray, 1879. A. Zooecia, X 25. 

 B. Decalcified cell, showing lateral tubular connections of the avicularian 

 chamber. C. Operculum of ordinary zooecium, X 85. D. Operculum of 

 ovicelligerous zooecium, X 85. (A-D after Waters, 1889.) 



E-I. Emballotheca quadrata MacGillivray, 1880. E. Zooecia, X 23. 

 Six different zooecia take part in the formation of the ovicell figured. 

 F. Aperture of zooecium, X 75. G. Operculum of ovicelligerous 

 zooecium, X 55. H. Operculum of ordinary zooecium, X 55. I. Avicu- 

 larian mandible, X 75. (E-I after Levinsen, 1909.) 



EMBALLOTHECA LATI- 

 CAPITATA, new species. 



Plate 48, fig. 6. 

 Description. The 



zoarium is free and 

 bilamellar. The zoo- 

 ecia are large dis- 

 tinct, very little elongated, polygonal, enlarged distally; the frontal is convex, 

 formed of a tremocyst closely united to the subjacent, finely perforated olocyst; 

 the tremopores are wide and separated by small tuberosities. The aperture is 

 large, elongated, with a very large, semicircular rimule, with two salient denticles 

 serving as pivot. The ovicell is enormous, somewhat embedded in the distal zooecia, 

 globular and salient. Two large, triangular avicularia are placed above the aper- 

 ture ; their beak is directed toward the medium axis of the zooecia ; they have a 

 strong calcareous pivot. 



Measurements. Aperture of (Aa=0.25 mm. 

 ordinary zooecia I Za=0.20 mm. 



. . . rAff=0.32mm. 



Aperture of ovicelled zooecia , _ 



I fa =0.30 mm. 



. (Zs=0.80mm. 

 Zooecia-' ^ 



Uz=0.70mm. 



