PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 67 



white and cream-color" with finely variegated arms, or "dull blackish with not very 

 evident yellowish markings on pinnules and arms." 



DOBOMETRA AEGTPTICA (A. H. CIsrk) 



Antedon parvicirra (not of P. H. Carpenter, 1888) Chadwick, Journ. Linn. Soc. (Zool.), vol. 31, 1908, 

 p. 45 (Suez Bay, 10 fms.). — A. H. Clark, Proc. U.S. Nat. Mus., vol. 40, 1911, p. 5 ( — Iridometra 

 [Dorometra] aegyptica). 



Iridometra parvicirra A. H. Clark, Amer. Nat., vol. 43, 1909, p. 255 (discussion of Chadwick'a 

 specimen). 



Iridometra aegyptica A. H. Clark, Proc. U.S. Nat. Mus., vol. 40, 1911, p. 5 { = Antedon parvicirra 

 Chadwick), p. 9 (northeastern coast of Africa), p. 42 (synonymy; description; localities); Crinoids 

 of the Indian Ocean, 1912, p. 41 i = A. parvicirra of Chadwick), p. 231 (synonymy; localities); 

 Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 53 (description; comparisons). 



Iridiometra aegyptica A. H. Clark, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 53 (typographical 

 error) . 



Dorometra aegyptica A. H. Clark, Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 128 (listed); 

 Unstalked crinoids of the Sibo^a-Exped., 1918, p. 215 (in key; range), p. 217 (references) ; John 

 Murray E.xped. 1933-34, Sci. Reports, vol. 4, No. 4, 1937, p. 102 (range), p. 104 (listed). 



Diagnostic features.— P 2 is intermediate in size and in the number of its component 

 segments between Pi and P3; the cirri are not especially slender, the longest segments 

 being not more than about twice as long as the diameter of the expanded ends; they 

 are very much larger than the cirri of D. parvicirra, from 10 to 13 mm. long when the 

 arm length is 40 mm., comparatively stout with usually 15 or 16 segments; and Pi 

 has 8, P2 12, and P3 18 to 20 segments. 



This is the only species of the genus at present known from the Red Sea area. 



Description. — The cirri are XXV, 14-16 (usually 15-16), from 10 to 13 mm. long, 

 and comparatively stout. The first segment is short, the second is about as long as 

 broad, and the fourth or fifth is the longest, about two and a half times as long as the 

 median diameter. The following segments slowly decrease in length, so that the 

 antepenultimate is about one third again as long as broad. The opposing spine is 

 prominent, terminal, and directed obliquely forward. The longer proximal segments 

 are constricted centrally, with enlarged distal ends, and the cirri as a whole are rather 

 strongly compressed laterally. 



The 10 arms, which were probably about 40 mm. long, resemble those of D. nana. 



Pi is short, evenly tapering from the base to the tip, about 5 mm. long and com- 

 posed of 8 segments which become twice as long as broad distallj'. Po is considerably 

 larger and much longer, but evenly tapering and becoming very slender distally, 9.5 

 mm. long with 12 segments which become much elongated in the outer portion. P3 is 

 larger than Pj, much the longest and largest pinnule on the arm, but becoming very 

 slender distally, 13 mm. long with 18 to 20 segments of which the distal are much 

 elongated, three times as long as broad; the ends of the segments are slightly swollen, 

 but there are no spinous projecting borders. P4 is small and weak, from 4.5 mm. to 

 5 mm. long, its outer segments much elongated and with somewhat swollen ends. 

 P5 is slightly longer. The following pinnules are similar, becoming more slender and 

 increasing in length distally. 



Locality. — Suez Bay; 18 meters; mud; Cyril Crossland [Chadwick, 1908; A. H. 

 Clark, 1911, 1912, 1913] (1, B.M.; could not be found, 1958). 



History.- — This species was found by Mr. Cyril Crossland in the course of his 

 collecting in the Red Sea and was recorded under the name of Antedon panicirra 



