A MONOGRAPH OF THE EXISTING CRINOIDS 69 



Palmata group on the other. Tho lateral flattening of the lower brarhials is scarcely 

 more distinct than in Antedoit (Dlchrometra) fagellata or Antedon briricuntnta (= 

 Lamprometra jmlmata); but P t has prismatic lower segments and the ambulacra of (he 

 disk, arms, and pinnules are well plated, though the interpalmar areas of the disk are 

 comparatively bare. The genital pinnules are not specially distinguished, however, 

 except by their shortness, and their glands arc not protected by any special pavement 

 of plates as in Antedon (Perissometra) flexilis and A. (P.) patula, though there is an 

 ambulacra! skeleton above them which is less completely differentiated than in the 

 slender Inter pinnules. Dr. Carpenter said that the presence of blunt spines on the 

 later cirrus segments also distinguishes this species from A. (P.) flexilis, A. (P.) patula, 

 and A. (P.) robusta, all of which have very smooth cirri, and are altogether of a more 

 robust nature. 



In my first revision of the old genus Antedon published in 1907 compressa was 

 assigned to the genus Charitometra. Early in 1908, in a paper on new genera and 

 species of unstalked crinoids, 1 remarked that compressa, which I had placed in Cltarito- 

 metra, should have been referred to the genus Tkalassometra. Later in the same year 

 in describing Thalassometra fsheri I compared it with Thalassometra compressa "of 

 the. Philippines." The Philippine specimens at hand represent P. granulata which at 

 that time I had not distinguished from compressa. Early in 1909 compressa was referred 

 to the new genus Parametra. 



Dr. Clemens Hartlaub early in 1912 discussed the Spinifera group of Ai<ti<l<>n in 

 considerable detail, including in it 18 species, among them Antedon compressa. In 

 my memoir on the crinoids of the Indian Ocean published later in the same year I 

 listed Parametra compressa, giving the synonymy and range. The locality "Philip- 

 pines" refers to P. granulata. 



In 1913 in a paper on the crinoids in the British Museum, which I had examined 

 in 1910, I recorded and gave notes on two specimens of Parametra compressa from 

 Challenger station 192 and, under the name of Parametra granulata, recorded and gave 

 notes on one specimen from station 201. In my report upon the unstalked crinoids of 

 the Siboga Expedition published in 1918 I recorded and described in detail a specimen 

 of Parametra compressa from station 302. 



Dr. Torsten Gisl6n in 1928 published additional notes upon the two specimens in 

 the British Museum from Challenger station 192. 



PARAMETRA GRANULATA A. H. Clark 



PLATE 7, FIGURE 25; PLATE 10, FIGURES 31, 32 

 [See also vol. 1, pt. 2, figs. 874-878, p. 435.] 



Antedon compressa (part) P. H. CARPKNTER, Challenger Reports, Zool., vol. 26, pt. 60, 1888, p. 222 

 (specimen from Challenger station 201). 



Thalassometra compressa A. H. CI-AKK, Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 227 (Albatross 

 station 5110). 



Parametra compressa A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 406 (Albatross stations 

 5255, 5166); vol. 39, 1911, p. 554 (Albatross stations 5279, 5325, 5367, 5411, 5519, 5523, 5536; 

 specific characters) ; Crinoids of the Indian Ocean, 1912, p. 213 (in part; records from the Philip- 

 pine Islands). 



Parametra granulata A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 4. r > (puhli-lir.l 

 reference to specimen in tl'c H. M.; Clill<:ngcr station 201; characters of the division series and 

 lower brachials). F. W. CLARKE and \\"IIEF.I.ER, U. S. Gcol. Surv. Prof. Pap. 90 D, 1914, pp. 



