A MONOGRAPH OF THE EXISTING CRENOIDS 329 



the middle of the arm the brachials are frequently, though not always, ornamented 

 with beadlike tubercles of which the middle one is the largest. Pourtales said that the 

 first pinnule is the longest and very broad on the first brachial, by which he probably 

 meant the epizygal of the first syzygial pair. 



Hartlaub remarked the absence of any statement regarding the number or state 

 of preservation of PourtaleV specimens. In view of Hartlaub's observations the most 

 striking deviation is that the ornamentaoion of the arms is confined to the middle, 

 while he found it developed only on the arm bases. Pourtales' statements regarding 

 the proximal border of the saddle-formed brachials are in complete agreement with his 

 observations. 



The differences between Pourtales' original description and Hartlaub's redescrip- 

 tion are probably explained by a specimen in the Museum of Comparative Zoology 

 (No. 267) from Blake station 45 which is labeled "Antedon granulifera" and is probably 

 the one on which Pourtales' original description was mainly based; it was not seen by 

 Hartlaub. 



In this specimen the longest cirrus has 18 segments and is 33 mm. long and rather 

 slender. The IIBr series are of 4 ossicles of which the two outer are not united by 

 syzygy. The division series and arm bases are perfectly smooth dorsally, rather strongly 

 convex, and sharply flattened laterally. The earlier brachials have prominently and 

 rather abruptly everted ends, and usually a more or less prominent tubercle in the middle 

 of the distal edge. 



Both the specimens from Blake station 34 are very poorly preserved. Almost all 

 the arms are broken off close to the base. The larger lacks the disk. This specimen 

 shows the closest agreement with that from Blake station 45, while the smaller is 

 remarkable for its more strongly spiny ornamentation. 



The larger specimen has well preserved cirri, one of which exceeds the others, 

 reaching a length of 35 mm. Especially to be noticed, according to Hartlaub, is the 

 fact that in this specimen the small prominences in the middle of the ossicles of the 

 division series are not knoblike, but take the form of feeble elongate ridges. This type 

 of ridge is found highly developed in a specimen from Montserrat (Blake station 157) 

 that Carpenter has apparently referred to granulifera but which Hartlaub described 

 under the name of Antedon angusticalyx (see var. angusta, p. 335). There is a single well 

 preserved PI. It is about 12 mm. long and is composed of 25 segments which from the 

 ninth onward are elongate. The lowest segments, like those on the two following 

 pinnules, are carinate. The pinnules immediately following have more uniform, 

 strongly broadened, segments. The elongate form of the pinnule segments forms a 

 very noteworthy contrast to the conditions in the specimen from Blake station 45. 

 Hartlaub remarked that if we wish to form a correct estimate of the range of forms in 

 such a variable type as granulifera we must present the small individual variations 

 with the greatest care. 



In the larger specimen from Blake station 45 Hartlaub noted on individual arms 

 saddle-shaped brachials with spiny ends. In the smaller specimen from Blake station 

 34, of which the arms are about 75 mm. long, he found the distal ends of all the ossicles 

 from the IBr axillary to about the thirteenth brachial beset with small, stout, erect 

 spines. Isolated small spines are also found on the dorsal surface. On the ossicles 

 of the division series there is a small knoblike elevation in the middle. The proximal 



