516 
BULLETIN 10G, UNITED STATES NATIONAL MUSEUM. 
Genus HASWELLIA Busk, 1884. 
1884. Haswellia Busk, Report on the Polyzoa collected by H. M. S. Challenger, pt. 1, p. 1TL 
The apertura has its proximal border notched by a very wide rimule not sep- 
arated from the anter. The frontal is a very thick tremocyst. The spiramen is a 
small salient tube. The zoarium is cylindrical. 
Genotype. — Haswellia ( Myriozoum ) australiensis Haswell, 1880 . 
Range. — Jacksonian — Recent. 
Fig. 150. — Genus Haswellia Busk, 1SS4. 
A-K. Haswellia australiensis Haswell, 18S9. A. Zooeeia, X 25. B, C, D, E. Successive 
aspects of the visible orifice, X 50, showing development of the peristomie. F. Zoarium natural 
size. (A-F after Busk, 1S84.) G. Operculum, X 85. (After Waters, 1881.) H. Operculum, 
X 75. (After Levinsen, 1909.) I. Transverse section. (After Busk, 1SS4.) J. Longitudinal 
section, X 25. (After Waters, 1909.) K. Longitudinal section, X 17. (After Levinsen, 1909.) 
ap, apertura; op, operculum closing the apertura; ov, ovicell ; pe, peristome; pi, peristomie; 
pis, peristomice; sp, spiramen; tr, frontal tremocyst. 
