PART 5 A MONOGRAPH OF THE EXISTESTG CRINOIDS 111 



a slight central constriction; the outer in lateral view have a quite straight dorsal, and 

 a nearly straight ventral, profile. 



The distal border of the radials is even with the rim of the centrodorsal. 



The IBr, are very short, from five to sLs times as broad as long, with the distal 

 and proximal edges parallel and the lateral edges slightly convergent, making an angle 

 of about 90° with those of the adjacent IBr,, the perisomic area thus exposed being 

 entu-ely covered by a conspicuous group of perisomic interradials. The IBrj (axil- 

 laries) are triangular, half again as broad as long, with the anterior angle somewhat 

 produced. 



The 10 arms are 105 mm. long, becoming extremely slender and attenuated dis- 

 tally; the brachials resemble those of the other species of the genus; their distal edges 

 are slightly produced and finely spinous. 



Syzygies occur between brachials 3+4, 9 + 10, 14 + 1.5 and distally at intervals of 

 3 muscular articulations. 



P, is 15 mm. long, composed of 30 segments, of which the first is broader than 

 long, the second half again as long as broad, and the third and following twice as long 

 as broad, becoming longer in the distal half; from about the fifth onward the segments 

 have overlapping and prominently spinous distal ends; the pinnule is considerably 

 stouter basallj' than P2 and the succeeding pinnules, but becomes exceedingly attenu- 

 ated and flexible in the distal half. P2 is 10 mm. long, with 24 segments, more slender 

 than P, and with relatively longer segments, which have more prominently spinous 

 distal ends. P3 is 7 mm. long, with from 13 to 15 segments, tapering more gradually 

 than P2 and hence appearing stouter, and without the long flagellate tip. P4 appar- 

 ently resembles P3, but is somewhat shorter. 



Locality.— Tahiti, Society Islands [A. H. Clark, 1918] (1, Munich M.). 



Genus ANTEDON de Freminville* 



AfKoiKvriiios LiNCK, De Stellis marinis, Leipzig, 1733, p. 55. — Leuckart, Zeitschr. organ, phj'sik, vol. 

 3, 1829, p. 377.— W. B. Cabpentek, Phil. Trans. Roy. Soc, vol. 15G, 1866, p. 678 (history).— 

 P. H. Carpenter, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, p. 2 (history). 



Asterias (part) Linnaeus, Systema Naturae, ed. 10, vol. 2, 1758, p. 663; ed. 12, 1767, p. 1098. — 

 Pennant, British zoology, vol. 4, 1777, p. 55. — Retzius, Kungl. Svenska Vet.-Akad. Handl., 

 1783, vol. 4, p. 241. — Olivi, Zoologia adriatica, Bassano, 1792, p. 66. — Nemnich, Allgemeines 

 Polyglotten-Lexicon der Naturgeschichte, vol. 1, 1793, pp. 1172, 1490. — Retzius, Dissertatio 

 sistens species cognitas asteriarum, Lundae, 1805, pp. 3.3-35. — Treviranus, Biologie, Gottingen, 

 vol. 3, 1805, p. 44. — Rafinesque, Principes fondamentaux de somiologio, Palermo, 1814, p. 24. — 

 Tiedemann, Anatomie der Rohren Holothurie, Landshut, 1816, p. 36. — Griffith, Cuvier's 

 Animal Kingdom, 1835, p. ex. — W. B. Carpenter, Phil. Trans. Roy. Soc, vol. 156, 1866, p. 

 680. — P. H. Carpenter, Trans. Linn. Soc. (Zool), ser. 2, vol. 2, 1879, p. 2. 



Asteria (part) Bbunnich, Zoologiae fundaraenta, Copenhagen & Leipzig, 1772, p. 230. 



Antedon de Freminville, Bull. Soc. Philom. Paris, vol. 2, 1811, p. 349. — Rafinesque, Analyse de la 

 nature, Palermo, 1815, p. 153. — [Bosc], Nouveau Dictionnaire d'Histoire Naturelle, vol. 2, 1816, p. 

 136; vol. 7, 1817, p. 399. — de Blainville, Diet. Sci. Nat., vol. 10, 1818, p. 107. — Lamouroux, En- 

 cyclopcdie mcthodique, vol. 2, 1824, p. 204. — de BLAIN\^LLE, Diet. Sci. Nat., vol. 60, 1830, p. 

 230. — [Gervais], Dictionnaire universel d'histoire naturelle, vol. 4, 1844, p. 130. — Gray, List of 

 British animals in the British Museum, pt. 1, Ceiitroniae or radiated animals, 1848, p. 28. — 

 DuJARDiN and Hupe, Histoire naturelle des zoophytes, fichinodfermes, 1862, p. 192. — Carus, 

 Handbuoh der Zoologie, vol. 2, 1863, p. 515. — Norman, Ann. Mag. Nat. Hist., ser. 3, vol. 15, 1865, 

 p. 101.— Wyville Thomson, Phil. Trans. Roy. Soc, vol. 155, 1865, pp. 513-544.— Bohlschb, 



*See also Addenda (pp. 83.5-837) under 1956, 1957, 1962, 1963, 1965. 



