A MONOGRAPH OF THE EXISTING CRINOIDS 127 



In arms arising from IBr axillaries the first syzygy is between brachials 3 + 4; 

 in arms arising from IIBr axillaries the first syzygy is between brachials 1+2, and 

 the second on the outer arms is always between brachials 3 + 4, while on the inner 

 arms it is usually between brachials 3 + 4, though sometimes between brachials 

 4 + 5 or 5 + 6 ; rarely this second syzygy is omitted on the inner arms. 



PI is from 15 to 18 mm. long, and is composed of about 45 segments, of which 

 the first 5 or 6 are about twice as broad as long, pointed dorsally, and the following 

 become gradually less broad and about as long as broad after the tenth. The distal 

 comb arises gradually; it is composed of 3 or 4 rudimentary and 16 well-developed 

 teeth which are rounded triangular, higher than broad, slightly incurved, well sep- 

 arated basally, and about equal in height to the width of the segments which bear 

 them. The more proximal teeth are separated basally by a space about equal to 

 their own basal width, but this space decreases distally. P 2 is from 9 to 12 mm. 

 long with about 40 segments, and resembles PI but is less stout basally. P 3 is from 

 8 to 9 mm. long with 32-35 segments, resembling P 2 but slightly more slender. P 4 

 is similar to P 3 and of about the same length. P 5 is 6 mm. long, slightly stouter than 

 P 4 , and more evenly tapering, with about 16 segments, of which the first is short 

 and the following gradually increase in length, becoming about as broad as long after 

 the seventh and about twice as long as broad terminally; this pinnule bears no comb. 

 The following pinnules are similar but slowly increase in length, P u and Pj 5 being 9 

 mm. long. The distal pinnules are about 12 mm. long with 24 segments, of which 

 the first 2 are very short, the fourth and fifth are about as long as broad, and those 

 following gradually become elongated, being about twice as long as broad distally. 



The pinnules in the proximal portion of the arm are more or less carinate dorsallv, 

 especially in the basal part; this character gradually becomes less and less marked, 

 disappearing at the end of the proximal third or half of the arm. 



The disk is naked, or more or less covered with large or small calcareous concre- 

 tions. The anal tube is usually subcentral and the mouth submarginal; but either 

 the anal tube or the mouth may be quite central in position. 



The color in alcohol is white, straw colored, dark gray, or light or dark brown, 

 either plain or more or less mixed with dirty lilac. Most of the specimens which I 

 have examined are straw colored with a median dorsal line of light brown on the arms. 



This description was drawn from typical specimens in the Albatross collection and 

 does not take into account extreme and unusual features exhibited by a small 

 minority of individuals. These are considered in the discussion following. 



Notes. Among the multibrachiate specimens which Hartlaub referred to this 

 form he noted three marked varieties which he designated as pulchella, alata, and 

 planata. He remarked that the last is so very different that he was long in doubt 

 whether it ought not rather to be considered as a valid species; but he found in the 

 collection a few intermediates between it and true pulchella. 



The characters of the variety planata are found in the division series, which are 



broad and flattened, broadly in contact with their neighbors laterally, and broadly 



'wall-sided." Very young individuals sometimes exhibit not only these features, 



but in addition also have a very large number of arms. The extreme phase of this 



variety was found in a lot which unfortunately had no locality label. Except for the 



