448 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



•sup.cwic. 



\inf.ayia. 



Fig. 180. — Genus Coslaticella Maplestone, 1899. (Coslicella Levinsen, 1909) 



A-L. Costaticella hastala Busk, 1852. A. General aspect, frontal and dorsal of 

 two branches and zoarium J^ natural size. (After MacGillivray, 1888.) B. A 

 branch bearing a gonoecium; frontal view. (B, C. *After Busk, 1852.) C. The 

 same from the basal surface. D. A zooecium; X75. E. A bizooecial internode. 

 The longitudinal sternal sinus can be seen, X75 m, mother zooecium, d, daughter 

 zooecium; I, the suprascapular chamber; II, the scapular chamber; III, the 

 infrascapular chamber; IV, the pedal chamber, X40. F. Sternal area and aper- 

 ture. The long frontal sinus is distinctly visible, X40. G. A part of the sternal 

 area from the internal surface. Outermost the margin of the cryptocyst plate, 

 further in the frontal surface, X40. H. A terminal gonoecium, lateral view, 

 X40. I. A gonoecium from the frontal surface, X40. J. The distal end of 

 another gonoecium, X55. K. A sagittal section through a gonoecium. The 

 endozooecial ovicell formed from the distal wall and covered by a kenozooecium 

 is seen, X40. (D-K. After Levinsen, 1909.) L. Operculum, X85. (After 

 Waters, 1887.) M. A zooecium of the genotype Costaticella lineata MacGillivray, 

 1895, showing terminology, j, chitinous joint; pm' , distal group of parietal 

 muscles;/, sh., frontal shield; cs, compensatrix; pm, parietal muscles; sup. avic, 

 6upra avicularian compartment; pol., rudimentary avicularian polypide; avic, 

 avicularian compartment; inf. avic, infra-avicularian compartment; cp, septula. 

 (After Harmer, 1902.) 



