MONOGRAPH OF THE EXISTING CRINOIDS. 737 



From a cursory examination of preserved specimens it is evident that many 

 additional species of which no color notes have been taken can be assigned to one 

 or other of the classes given above, and also that specimens of a number of littoral 

 species, chiefly belonging to the Stephanometridse, occur in which each brachial 

 bears a dark transverse band. The coloration of preserved specimens will be dis- 

 cussed later. 



As a general rule the coloration of the pinnules follows that of the arms, but 

 occasionally an abruptly different type is found : 



I. Pinnules banded on each segment : 



Capillaster clarki. Pectmometra flavopurpurea. 



This color type is found in a number of species as preserved, and in at least 

 one case is a good specific character. 



The cirri are usually unicolor, less commonly dull at the base, becoming grad- 

 ually or abruptly brighter distally, and rarely show distinctive color types; when 

 this occurs the color types are usually a reflection of the color types of the division 

 series and arm bases, very rarely distinctive (Type I). 



Particolored cirri, except those which are merely brighter distally, as in the 

 case of the cirri of most of the species of Thalassometrinse, fall into the follow- 

 ing classes : 



I. Each cirrus segment with a transverse band : 



Zygometra microdiscus, young. Heterometra nematodon. 



Zygometra punctata. Neometra multicolor. 



Calometra separata. 



II. Cirri unicolor, but of a color not found in the calyx or arms : 

 Zygometra pristina. PtUometra macronema. 

 Lamprometra protectus. Oceanometra gigantea. 



Antedon petasus. 



III. Cirri blotched or spotted : 



(a) Cirri with irregular blotches or irregular bands: 

 Comissia peregrina. Calometra separata. 

 Comissia lutkeni. Daidalometra hana. 

 Pectinometra flaropurpurea. Eumetra ckamberlaini. 

 Neometra conaminis. Perometra diomedece. 



Cyclometra clio. 



(b) Cirri with small spots: Pterometra pulcherrima. 



IV. Cirri longitudinally striped : 



Lamprometra protectus. Heliometra gladalix. 



Longitudinal striping is characteristic of the cirri of a number of species of 

 which no color notes have been taken. 



The very young pentacrinoid is semiopaque. white or whitish, with the reddish 

 brown visceral mass obscurely visible through the body wall. The first color to be 

 assumed is usually yellowish white or yellow, and in Antedon bifida as the animal 

 increases in size the body and the proximal portion of the arms gradually assume 

 the characteristic red of the adults, while the distal portion of the arms remains 

 sulphur yellow. 



