86 



ERNEST WARREN. 



It appears that the pinnules invariably spring from the lower 

 side of the pinna?. They are set at an angle of about 30° to 

 the pinna, and project downwards and outwards. These short 

 pinnules are characteristic of the species. 



Length of the pinnate-stem with 11 pairs of pinnfe about 

 12 mm., proximal non-pinnate portion 4 mm., pinnate part 

 8 mm. Diameter of main-stem in non-pinnate region 0"16 mm., 

 thickness of perisarc 21*58 /i. Length of thecate internode 

 about 0*30 mm., width 0'14 mm. The average length of 



Text-fig. 2. 



Internodes of pinna and base of pinnule, x 200. 



pinna with two hydrothecse is about 0'91 mm., and the 

 average length of pinnule is about 0"51 mm. The ccenosarc 

 of the internodes exhibits an ectoderm channel on the posterior 

 surface (text-fig. 3, A, p.e.c). 



Hydrotheca. — Cup - shaped, rather deep, expanding, 

 margin somewhat everted, adcauline surface not adnate for 

 whole length, but free above for about one-half of its length. 

 Plane of mouth of hydrotheca is set at an angle of about 35° 

 to main-stem or pinna. The hydrothecee are placed on the 

 front or anterior surface of the pinnte (text-fig. 1, C). 



Height of hydrotheca about 0*16 mm., width at mouth 

 about the same. 



