A MONOGRAPH OF THE EXISTING CRINOIDS 71 



9 mm, long and with 14 segments. PS is 8 mm. long with 14 segments. P 4 is 6 mm. 

 long with 13 segments. P 6 is 6 mm. long with 15 segments. P B is 7 mm. long with 

 19 segments. P is 9 mm. long with 14 segments. P b is 8 mm. long with 13 segments. 

 P d is 6 mm. long with 14 segments. 



A sixth specimen from station 10 is of the scabra type with the arms 60 mm. 

 long. The cirri are XXXI, 25-26, with the proximal ridge beginning on the fifth 

 and the distal on the ninth segment. P: is 11.5 mm. long with 16 segments. P 2 is 



10 mm. long with 16 segments. P 3 is 9 mm. long with 14 segments. P 5 is 8 mm. 

 long with 19 segments. P a and P b have 12+ segments. 



In a seventh specimen from station 10 the cirri are XXVII, 24-32, those in 

 the apical row having 24-29 and those in the proximal row 25-32 segments. PI is 



11 mm. long with 15 segments. P 3 has 14 segments. P a has 15 segments. P c has 

 15 segments. P d has 19 segments. 



An eighth specimen from station 10 is of the scabra type with the arms about 

 70 mm. long. The cirri are XXIV (of which two are small), 19-28, those in the apical 

 row having 19-21 and those hi the proximal row 22-28 segments, the cirrus with 28 

 segments being young. In a cirrus from the proximal row with 22 segments the 

 proximal ridge begins on the fifth and the distal on the eighth. PI is 10 mm. long 

 with 15 segments. P 2 is 9.5 mm. long with 14 segments. P 4 is 7 mm. long with 15 

 segments. P a has 14 segments. P b has 14 segments, of which the distal are provided 

 with slight distal prominences, and is 10 mm. long. 



A ninth specimen from station 10 has the cirri XXV, 19-25, those in the apical 

 row having 19-22 and those hi the proximal row 23-25 segments. In a cirrus from 

 the apical row with 22 segments the proximal ridge begins on the third and the distal 

 on the seventh. In a cirrus from the proximal row with 24 segments the proximal 

 ridge begins on the fourth and the distal on the sixth. PI is 14 mm. long with 20 

 segments. P 2 has 18 segments. P 3 is 11 mm. long with 17 segments. P 4 has 20 

 segments. P 5 has 21 segments. P c is 10.5 mm. long with 18 segments. P g is 10 

 mm, long with 24 segments. 



In the type specimens of Lamarck's Comatula adeonae, which I examined at the 

 Paris Museum in 1910, the cirri are about XXX, 17-20 (most commonly 19), and 

 are very stout. The first segment is very short and those following gradually increase 

 in length, becoming nearly as long as broad on the sixth and following. The fourth 

 and following have on the dorsal surface two transverse ridges which appear as two 

 small spines in lateral view. 



The division series and first three brachials resemble those of the species of 

 Tropiometra in being very broad and sharply flattened against their neighbors later- 

 ally. There is considerably more flattening than in the species of Tropiometra, as 

 the plates are deeper dorsoventrally. The four brachials following the first syzygial 

 pair are oblong and very short. The succeeding brachials are triangular, soon becom- 

 ing about as long as broad. 



The proximal pinnules are large and strongly prismatic. P, is the largest and 

 longest, and is composed of 8-10 segments, of which the third and fourth are the 

 largest and longest. The length, size, and stoutness of the pinnules gradually de- 

 crease to P s or P,. The distal pinnules are not much longer than P. 



The three small specimens from off Wardakau, Sungi Barki, as described by 



