PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 435 



The color in life is very variable. The entire specimen may be straw-colored, 

 very light grey, flesh-colored, pale or brilliant yellow, orange brown or purple; the 

 greater part of it may lack stronger colors except for bands of dark brown or purple 

 on the cirri or the arms, where the bands often coincide with the syzygial pairs, or 

 the pinnules, or all three; alternatively, portions of a specimen, such as the pinnules 

 or the distal parts of the arms, may be brown or purple or yellow. Different specimens 

 from one station may range in color from cream to dark brown or purple. 



Azotes. — Gauss (German South Polar Expedition), May 6, 1902, 172 meters; a speci- 

 men vnth 12 arms borne on 6 radials; the arms are 80 mm. long; the longest cirri are 

 28 mm. long with 28 segments; the dorsal surface of the ossicles of the IBr series and 

 lower brachials is rather prominently spinous; the covering plates are highly developed 

 but lack the narrow produced distal portion. The left posterior ambulacrum on the 

 disk supplies 4 arms. 



Gauss, June 20, 1902; 385 meters; the arms are 50 mm. long; the longest cirri are 

 18 nrun. long with 22 segments. 



Gaiiss, January 28, 1903, 380 meters; the arms are about 40 mm. long; the ossicles 

 of the IBr series and the lower brachials are very spinous. 



Gatiss, January 3, 1903, 380 meters; the arms are 30 mm. long; the longest cirri 

 are 9 mm. long and are composed of 17 segments. This specimen in all ways resembles 

 the preceding one. 



Gauss, June 20, 1902, 385 meters; the longest cirri are 17 mm. in length and are 

 composed of from 23 to 25 segments. The ossicles of the IBr series and the lower brach- 

 ials have the dorsal surface thickly covered with fine spines, and possess everted and 

 very spinous edges, as in the young of Heliometra glacialis. On the disk the left pos- 

 terior ambulacrum divides half way between the mouth and the edge of the disk, each 

 of these two derivatives supplying two arms; the other ambulacra are as in ordinary 

 10-armed endocyclic species. 



Of the 2 specimens from Aurora (Australasian Antarctic E.xpedition) station 8, one 

 is about two-thirds fuU size, with 8 rays and 16 arms, and the other is about half-grown 

 with 6 rays and 12 arms. 



The 5 specimens from Aurora station 9 all have 10 raj^s and 20 arms, which in the 

 largest are about 150 mm. long. In the smallest the middle two-thirds of the outer 

 half of the fourth and folIo\ving brachials is abruptlj- elevated and densely covered 

 with very smaU erect spines. In lateral view the dorsal profile of the arras shows an 

 abrupt and rather high rounded elevation occupying slightly less than the distal half 

 of each brachial. 



Two small specimens from Aurora station 10 have 10 rays and 20 arms. The 

 third specimen is fairly large with 8 rays and 16 arms. A single complete cirrus 80 mm. 

 long, with 40 segments remains. On the si.\th and following brachials a triangular 

 portion with the base occupying the entire dorsal portion of the distal edge and the 

 apex about in the middle of the brachial is abruptly elevated and studded with fine 

 spines, the dorsal profile of the lower portion of the arms being very conspicuously 

 scalloped. This disappears at about the thutieth brachial, after which the brachials 

 have a slightly produced and strongly serrate distal edge. 



Of the 8 specimens from Aurora station 12, one is large with 22 arms, one of the 

 IBr axillaries bearing 2 IIBr series, which exactly resemble the IBr series. Three of 

 the others are fully grown, with 10 rays and 20 arms. One, also with 10 rays and 20 



556-622—67 29 



