PART 5 A MONOGRAPH OF THE EXISTING CRINOID3 199 



long as broad and the following become progressively elongated distally reaching a 

 length of about twice their breadth. P 3 is similar to P 2 but very slightly stouter and 

 bearing a genital gland. The following pinnules increase very slightly in length and in 

 the number of their component segments, at the same time becoming gradually more 

 slender; after the tenth, the genital glands, which may be short and well rounded or long 

 and fusiform, gradually decrease in size, disappearing entirely at the twentieth to 

 twenty-sixth (rarely as late as the thirtieth). The distal pinnules are from 12 to 15 mm. 

 long, very slender, composed of about 30 segments of which the first is very short, 

 trapezoidal or crescentic, the second is about as long as its distal width, trapezoidal, 

 the third is somewhat longer than broad, and the following become progressively 

 elongated with slightly enlarged articulations, reaching a length of about two and a 

 half tunes the width distally. The distal pinnules remain very uniform until near 

 the end of the arms when they rather rapidly decrease in length. The segments of all 

 the pinnules have more or less overlapping and finely spinous distal borders. W. B. 

 Carpenter (1866) says that in the middle of the arm the number of segments in the 

 pinnules may average IS, and in the terminal portion this rapidly diminishes from 16 

 to half that number. 



Notes. The size of the Rosy Feather Star varies greatly, the arm length ranging 

 from 20 to 200 mm. 



In the Orkneys, Dalyell (1851) says that the average arm length is about 65 mm. 



Parkes (1891) gives the arm length of specimens from Lamlash Bay, Arran, as 

 from 50 to 90 mm. W. B. Carpenter (1866), speaking presumably of the same region, 

 says that the usual arm length is from 50 to 65 mm., though specimens exceeding this 

 are by no means uncommon, and he occasionally met with individuals with an arm 

 length of as much as 115 mm. 



According to Mr. Elmhirst (in a letter), around Millport the full size is about 125 

 mm. in diameter (with an arm length of about 63 mm.), and specimens 150 mm. in di- 

 ameter (with an arm length of 75 mm.) are rare. He wrote that these full sized examples 

 are probably in the second year. 



Chumley records a specimen from the mouth of Loch Strivan in the Clyde area 

 which had an arm length of 200 mm. 



Norman (1865) gives an average arm length of 57 mm. in shallow water, and of 

 140 mm. in deeper water. 



Hornell (1895), speaking of this species in Jersej 7 , says that the arms are often 90 

 mm. in length. 



Greeff (1882) says that those which he found near Lisbon had an arm length of 

 from 20 to 30 mm., but they were not sexually mature. Two which I examined from 

 Cezimbra, Portugal, had an arm length of about SO mm. 



Professor W. B. Carpenter wrote (1866) that the color of this species as he found 

 it at Lamlash Bay varies greatly. Commonly it is that which its trivial name rosaceus 

 implies; but the crimson frequently deepens to a rich damask hue, especially during the 

 breeding season, while it very frequently gives place to white on portions of the disk 

 and arms so that the animal has a beautifully variegated aspect. Sometimes, again, 

 the predominant hue is a rich orange, and this may be variegated with white or crimson, 

 or with a bright sulphur yellow. 



Dr. Grieve, speaking of material from the Clyde region (186S), says that it is usually 

 of a fine rose color, but sometimes tinted with yellow. 



