264 SIDNEY F. HAEMEK. 



S. neozelanica, Busk, var. maguifica, Busk (MS,). 

 Figs. 5, 26. 



The habit is encrusting, this variety covering large areas 

 and appearing to have a special fondness for oyster shells. 

 There are no I'ootlets. The basal wall is equal in size to the 

 upper wall, as in other encrusting species. The edge is more 

 distinct from the post-oral shelf, and the latter from the 

 cryptocyst, than in the Vincularian form. The oral shelf, as 

 in the latter, is represented by a mere line. The condyles are 

 not well marked. The oral arch is thick and more raised than 

 in the Vincularian form. The cryptocyst is thick, proximally 

 horizontal and tubercular, not much depressed, and it is 

 slightly thickened at the angle formed by the commencement 

 of its descent, which is vertical, the insertion being into the 

 basal wall. The pores are rather small. The opening of the 

 cavity of the median process is rounded or subtriangular, 

 not slit-like as in the Vincularian form, with which, however, 

 this variety agrees in the deep flask-shaped cavity of the 

 median process. The expanded mouth of the median process 

 does not meet the side of the zooecium, which has no tooth in 

 this position. The lateral recesses are bounded proximally 

 by a vertical portion of the cryptocyst. The tube is little 

 more than a circular perforation in the cryptocyst, being well 

 separated both from the basal and the lateral walls, and so 

 differing from that of the Vincularian form. As the opening 

 of the tube does not nearly reach the lateral walls of the 

 zooecium, the proximal boundary of the lateral recess is not 

 cut off by the tube from the deeper pai*t of the cryptocyst. 

 Tlie basal wall shows the insertion of the cryptocyst, which 

 marks off a distal chamber whose base is more or less semi- 

 circular or biconvex, the diameter of the semicircle (if of this 

 form) being constituted by the base of the distal wall of the 

 zooecium. 



The epithecal sclerites are subparallel, nearly straight, 

 rather short, and do not reach the operculum. 



The opercula (fig. 26) resemble those of the Vincularian 



