REPOftT ON THE CRINOIDEA. 317 



discoidea occurs between this depth and 118 fathoms. But all the remaining species of 

 the group belong to the purely littoral fauna of the Eastern seas. One of them is the 

 only described Actinometra which I have not personally examined. It is the Actino- 

 metra borneensis of Grube, whose type-specimen has disappeared since his death, and I 

 am, therefore, uncertain about its proper place in the following scheme. 



A. Arm-joints short and discoidal, . . . . . . 1. fimbriata, Lamarck, sp. 



B. Arm-joints shortly triangular, becoming more quadrate or discoidal. 



I. No palmars. 



a. Less than twenty-four cirrus-joints, . . .2. coppingeri, Bell. 



b. More than twenty-four cirrus-joints, . . . borneensis, Grube. 

 II. Two palmars, the axillary a syzygy. 



a. Less than thirty cirrus-joints ; no post-palmars, . . 3. mulliradiata, Linn., sp. 



b. More than thirty cirrus-joints ; post-palmars, like the palmars, 4. sentosa, n. sp. 



C. Arm-joints triangular, nearly as long as wide, . . . .5. lineata, n. sp. 



D. Arm-joints almost quadrate, . . . . . .6. discoidea, Carpenter, MS. 



1. Actinometra fimbriata , Lamarck, sp. (PI. LXII. figs. 2—4). 



Specific form ula — a. 3. 2br. —r . 



1816. Comatula fimbriata, Lamarck, Hist. Nat. des Animaux Bans Vertebres, Paris, 1816, t. ii. 



p. 534. 

 1S34. Comatula fimbriata, de Blainville, Manuel d'Actinologie, Paris, 1834, p. 249. 

 1841. Atecto fimbriata, Midler, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 1841, p. 185. 

 1843. Atecto fimbriata, Midler, Archiv f. Naturgesch., 1843, Jahrg. ix. Bd. i. p. 136. 

 1849. Comatula (Aleeto) fimbriata, Miiller, Abhandl. d. k. Akad. d. "Wiss. Berlin, Jahrg. 1817 



[1849], p. 258. 

 1862. Comatula fimbriata, Dujardin and Hupe, Hist. Nat. des Zoophytes, tfchinodennes, Paris, 



1862, p. 204. 

 1879. Actinometra fimbriata, P. H. Carpenter, Journ. Linn. Soc. Lond. (Zool.), 1877, vol. xiii. 



p. 443. 

 1879. Actinometra fimbriata, P. H. Carpenter, Trans. Linn. Soc. Lond. (Zool.), ser. 2, 1879, p. 27. 

 18S2. Actinometra fimbriata, Bell, Proc. Zool. Soc. Lond., 1882, p. 535. 

 1882. Actinometra fimbriata, P. H. Carpenter, Ibid., p. 747. 



Centro-dorsal a moderately thick disk bearing fifteen or eighteen marginal cirri of 

 twenty to twenty -four joints, the lower ones longer than wide, and the later joints more 

 or less spinous, sometimes considerably so. 



First radials barely visible ; the second short, wide, and closely united laterally. 

 Three distichals, the axUlary a syzygy. 



Eighteen to twenty arms, which are all tentaculiferous and sometimes dimorphic, 

 the anterior having one hundred and seventy joints as compared with one hundred and 

 fifty in the posterior arms. The joints are all short and wide, with nearly transverse 

 articulations, so as to become almost oblong after about the thirtieth, and generally 



