256 J- Pl'AYFAIR McMcRRICH. 



The base is adherent and tlie columii cylindrical and low 

 (Fig. 34). its diameter being- greater tlian its heiglit. It presents 

 several more or less marked horizontal folds or ridges due .to con- 

 traction, but no longitudinal ridges; whether or not Verrucae were 

 present on the upper part could not certainly be determined, though 

 it is probable that there were none. The outerniost tentacles were 

 marginal in position and the remaining C3''cles, of which there are 

 abont five (the innermost with twelve tentacles), occupy the greater 

 portion of the diso. Each tentacle has the form characteristic for 

 the Boloceridae and is rigid and usually shows indications of a 

 longitudinal tluting. In one specimen in which a count of the 

 tentacles was made, the total number feil somewhat below the 

 theoretical 192. owing to an incomplete development of the outerniost 

 cycle. The disc was smootli and the month almost circular, the 

 gonidial grooves being but poorly marked ; the stomatodaeum. which 

 was considerably evaginated in several individuals, was longitudinally 

 ridged. 



The label accompanying the specimens No. 232 stated that in 

 life they were "schön rosa", but all traces of color are Avanting in 

 the preserved material. In the largest individuals the height of 

 the column was 1.2 cm and the diameter of the base 3.2 cm, while 

 in smaller specimens the height was 0.7 cm and the diameter 2.3 cm. 

 The innermost tentacles had a length of 1.2 to 1.4 cm, and a 

 diameter at their broadest part of about 0.4 cm. 



Structure. The mesogloea of the column wall is rather thin 

 and at irregulär intervals has horizontal ridges projecting from its 

 outer surface. The circular musculature is well developed and in 

 the distal portion of the column increases in height to form a diffuse 

 endodermal sphincter (Fig. 35), supported upon numerous branched 

 mesogloeal lamellae, the uppei'most of which is situated immediately 

 beneath the bases of the outermost tentacles and is somewhat stronger 

 than the rest and gives rise to secondary lamellae from its lower 

 surface. 



A longitudinal section through one of the tentacles shows that 

 its mesogloea becomes very thin a short distance beyond where it 

 joins the disc and distally to tliis region thickens again quite 

 suddenly (Fig. 34). This is a feature common to all Boloceridae, but 

 in the present species a marked peculiarity is the absence of a 

 tentacular sphincter. I was much surprised to find no trace of it 

 in the first tentacle I sectioned and to make sure of its absence I 



