MONOGKAPH OF THE EXISTIKG CKINOIDS. 719 



Family COLOBOMETRID^E. 



[Cenometra unicomis. Arms light brown with very dark brown or black 

 spots; pinnules silver, with three or four very dark brown rings, wider ventrally 

 than dorsally, some in the proximal half of the arms entirely very dark brown ven- 

 trally ; centrodorsal light brown ; cirri dark brown, the dorsal half yellowish brown ; 

 disk gelatinous and transparent (probably regenerating) with oblong spots.] 



Cenometra delicata. Deep violet, the cirri, P 2 , and the dorsal side of the other 

 pinnules bright yellow. 



Cyllometra albopurpurea. (a) Black and white in narrow alternating cross 

 bands. 



(>) Dark purple and yellow in narrow alternating cross bands. 



(c) Arms dark purple as far as the last axillary, the remainder of the animal 

 white. 



(d) White, with a broad band of deep purple in the basal third of the arms and 

 two or three narrower bands distally. 



(e) Dull white, spotted more or less thickly with grayish or reddish purple. 

 Prometra chadwicki. Purplish black, the arms of one specimen regularly 



striped with yellow. 



Oligometrides adeonce. (a) Very variable, ranging from clear lemon or 

 canary yellow, with bands or purple marks, through variegated purple and yellow, 

 or variegated brown and white, to finely variegated shades of gray and white. 



(&) Dark red, the terminal segments of the proximal pinnules and the arm 

 tips with a silver sheen. 



Family TROPIOMETRID^E. 



Tropiometra afra. Dark purplish brown. 



Tropiometra macrodiscus. (a) Shining deep purple. 



(b) Bright yellow. 



Tropiometra carinata. Golden yellow or orange to somewhat brownish, with 

 uniform black spots along the sides of the arms and cirri. 



Tropiometra picta. (a) Deep purple with large spots of yellowish white on 

 the sides of the rays. 



(b) Varying from a light yellowish brown to a deep violet, with many inter- 

 mediate shades, specimens being usually banded with lighter and darker colorings, 

 and seldom of uniform tint. 



(c) " The first specimens of Tropiometra seen appeared to be uniformly dark 

 purple, purplish brown, reddish brown, or bright brown, but a closer examination 

 showed that uniform coloring was very rare. Almost always a longitudinal dorsal 

 stripe on each arm, or transverse bands of more or less width, or both, are present. 

 The color of these markings is yellow of some shade, often dull and buffy, but not 

 rarely quite bright. In some individuals the pinnules are also cross banded with 

 yellow, and the distal pinnules may be uniformly brownish yellow. The cirri are 

 yellow brown, at least dorsally, but are often more or less dusky or purplish on 



