Measurements. — 



62 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



TENNYSONIA CONTORTA Busk, 1875. 



Plate 11, figs. 11-14. 



1875. Idnionea contorta Busk. Catalogue Marine Polyzoa in British Mus- 

 eum, pt. 3, Cyclostomata, p. 12, pi. 8. 



1887. Idmonea contorta Wateks, Tertiary Bryozoa from New Zealand, 

 (Cyclostomata) Quarterly Journal Greological Society, vol. 43, p. 339. 



Interfascicular distance (in rec- 

 tilinear branches 0.20 mm. 



Width of fascicles . 12-0. 18 mm. 



Diameter of salient peristomes. . 12-0. 16 mm. 



Diameter of larger zooecia .20 mm. 



Maximum zoarial diameter 2.00mm. 



Number of tubes to fascicle 7 to 8. 



The specimens which we have studied were determined and sent 

 to us by Miss Jelly. They are a little different from Busk's figured 

 type, which does not show adventitious tubes, although, as shown on 

 plate 11, figure 12, the mesopores are not always closed. 



The fascicles are very salient and quite close together. Most often 

 the first tube is the larger; rarely it is the second. The peristomes 

 are not always adjacent; the first two or three only are joined to- 

 gether. The tubes are visible longitudinally on the posterior face 

 of the zoarium, which is in addition striated transversally. 



On the anterior face the two or three interfascicular mesopores are 

 more often closed by a calcareous lamella, finely perforated. 



The ovicell is large and finely punctated; it surrounds at least six 

 fascicles over the whole width of the zoarium. The oeciostome ap- 

 pears to be a larger tube than the others; but we are not certain. 

 One of our specimens is supported on a Refepora by very solid cal- 

 careous processes. 



OccurreJice. — Recent: Port Elizabeth, South Africa (Busk, Miss 

 Jelly). 



Family CYTISIDAE D'Orbigny, 1854. 



Tlie ovicell is a vesicle limited, elliptical, globular with special 

 walls. It is parallel to the zooecial axis and formed after the con- 

 solidation of the subjacent peristomes. 



Historical. — D'Orbigny, 1852 has classified the divers genera of 

 this family in his two familites of the Cytisidae and Fascigeridae, 

 according to the form of the tubes. This character was for him 

 fundamental and characteristic. Pergens, 1889, adopted the classifi- 

 cation of D'Orbigny. Gregory, 1909, has distributed the same genera 

 in the three families of Osculiporidae Marsson, 1887, Zonatulidae 

 Gregory, 1909, and Desnieporidae Gregory, 1909, according to the 

 nature of the adventitious pores. Of all these names those of 



