A MONOGRAPH OF THE EXISTING CRINOIDS 127 



is unusually great, exceeding that of the lower pinnules. Pa is present on four arms. 

 These arms are small and stunted, and arc obviously regenerated. 



In the specimen from Port Galera, Mindoro, the cirri arc XXVI, 53-55, 40 mm. 

 long. The longest segments, the seventh-twelfth, are not quite so long as the proximal 

 width. The arms are 145 mm. long. Pi is 11 mm. long and is composed of 18 seg- 

 ments of which the first is twice as broad as long, tlie second is shghtly broader than 

 long, the third is as long as broad, the eighth is twice as long as broad, and the eleventh 

 or twelfth and following are three times as long as broad. The pinnule is stiff, but 

 not spineUke, and is more or less flexible in the outer half. The last 6 or 7 segments 

 have a small tuft of spines on the distal edge. The segments in the proximal half 

 have a sharp middorsal crest which is not raised into a carination. P2 is 15 mm. long 

 with 17 segments, stiff and spinelike, about as stout basally as Pj but tapering with 

 extreme slowness. The first segment is twice as broad as long, the third is about as 

 long as broad, and the last thee or four are about three times as long as broad. The 

 fourth and following have the distal edge armed with fine spines which soon become 

 long and conspicuous, forming a flaring distal spinous collar which overlaps the base 

 of the segment succeeding. P3 is 14 mm. long with 14 segments, resembling P2 but 

 slightly stouter distally. P4 is 15 mm. long with 15 segments and resembles P3. 

 P5 is 16 mm. long with 16 segments and resembles P4. Pe is 16 mm. long with 18 seg- 

 ments. P7 is 15 mm. long with 16 segments. Pj to T^ are slightly stouter distally 

 than the pinnules precedmg and are composed of shorter segments which are never over 

 twice as long as broad. After P7 or Pg the pinnules become more slender with more 

 elongated segments in the outer half. 



The specimen from Vatek van Toeal has the arms 170 mm. long. Only a single 

 cirrus remains; this has 52 segments. The longest segments of the best developed 

 cirri are not so long as the width of their expanded ends. Pi is 14 mm. long with 13 

 segments. P2 is 21 mm. long mth 16 segments. P3 is 22 mm. long with 15 segments. 

 P4 is 20 mm. long with 14 segments. Pj is 19 mm. long with 14 segments. Pj is 17.5 

 mm. long with 15 segments. P7 is 16 mm. long with 15 segments. 



Remarks. — In 1909 I wrote that this species appears to be quite distinct from 

 C. perspinosa. It has fewer cirrus segments, all of which are short, none being so long 

 as broad. The cirri are comparatively short, and are stout basally, tapering distally. 

 P2, P3, and P4 are enlarged and spinelike, nearly equal, but Pi is much shorter and 

 less stiff. The middle and distal pinnules are shorter than they are in C. perspinosa, 

 and have the distal ends of the segments but slightly expanded and bearing only 

 minute spines. After an examination of the type specimen of C. perspinosa I wrote 

 in 1911 that its proximal pinnules are comparatively slender, not so stout as are those 

 of C. vepretum. Further experience has shown that there is really very little difference 

 between these forms. It is probable that they represent geographical races of the 

 same specific type, perspinosa in its typical form occurring on the coasts of northern 

 Australia and in the regions adjacent, and vepretum farther north, the two intergrading 

 in the vicinity of Amboina. 



Localities. — Bantayan reef, Cebu, Philippines; Dr. Lawrence E. Griffin (5, 

 M. C. Z., 385, 393). 



Dr. Th. Mortensen's Pacific Expedition 1914-1916; Port Galera, Mindoro; about 

 9 meters; February 3, 1914 (1). 



