A MONOGRAPH OF THE EXISTING CRINOIDS 33 



Cenometra bella. In a specimen with arms 90 mm. long the third brachial has 21 

 septa, of which 10 are complete and 2 are indistinct ventral beams, with the degree of 

 strength 3. The thirtieth brachial (second hypozygal) has 19 septa, of which about 

 6 are complete. Gislen says that this reminds one of the Liparomctra type. 



Cyllometra manca ("disci/ormis"). In a specimen with an arm length of 90 mm. 

 the third brachial has 16 septa, of which 9 are complete and 2 are ventral beams, with 

 the degree of strength 3; the areola is narrow and rather indistinct. The thirteenth 

 brachial (second hypozygal) has 17 septa, the eighteenth has 14, the twenty-third 

 has 15, the twenty-ninth has 13, and the thirty-fifth (sixth hypozygal) has 13. The 

 areola is lacking. The degree of strength is 1-2. 



Oligometrides adeonae. In a specimen with arms 60 mm. long the third brachial 

 has 30 septa, of which 13 are complete and one is a ventral beam; the areola is indis- 

 tinct; the degree of strength is 3. The nineteenth brachial (second hypozygal) has 

 24 septa, of which about 11 are complete; the ventral beam is indistinctly bifurcated. 

 There are traces of synapticulae. 



Austrometra thetidis. In a specimen with the arms about 40 mm. long the third 

 brachial has 15 septa of which 5-6 are complete; the areola is rather narrow, but 

 distinct, with a broad smooth area united with the ventral part of the joint face; the 

 degree of strength is 2. 



Clarkometra elegans. In a specimen with arms 25 mm. long the third brachial 

 had 11 septa, scarcely any complete, and a narrow indistinct areola; the degree of 

 strength is 2-3. 



THOPIOMETRIDAE 



Tropiometra afra macrodiscus. In a specimen with the arm length 190 mm. the 

 distal end of the third brachial has about 52 septa, of which about 25 are complete, 

 some of these being finished. The ventral portion of the joint face has rather irregular 

 pits and a ring of tubercles which is synapticularly arranged. The areola is large 

 and stout, protruding as a small cone that rises from a surrounding concavity. The 

 degree of strength is 4. In another case there were 51 septa, about 27 complete. 



CALOMETRIDAE 



Pectinometra flavopurpurea. In a specimen with arms 70 mm. long the third 

 brachial has 14 septa, 2 complete; the ventral beam is very broad, and the areola is 

 broad and stout; the degree of strength is 2. The thirteenth brachial has 15 septa. 

 The twentieth brachial (third hypozygal) has about 15 septa, which are similar to 

 those of Mariametra. 



Neometra multicolor. In a specimen with the arm length of about 60 mm. the 

 third brachial has 19 septa of which 5 are complete and 2 are ventral beams; the 

 areola is broad and stout, though rather low; the degree of strength is 3. The thir- 

 teenth brachial (second hypozygal) has 15 septa, 5-6 of them complete. 



PTILOMETRIDAE 



Ptilometra mulleri. A specimen with an arm length of 50 mm. has the fifth 

 brachial (first hypozygal) with 21 septa, two of them indistinct ventral beams; the 

 areola is indistinct; the degree of strength is 3. A concentric furrow is present, as 



