PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 39 



Remarks [by A.M.C.]. The key to the families of Macrophreata given in part 3 

 of this work (page 71) needs some modification since not only has the family 

 Notocrinidae been removed to the suborder Ohgophreata but also the Siboga collections 

 yielded two new genera (one of them, Sibogacrinus, described here for the first tune) 

 which necessitate some qualifications in the characters used before. 



KEY TO THE FAMILIES OF MACROPHREATA 

 [by A.M.C.] 



a 1 . First syzygial pair oblong or squarish or slightly wedge-shaped and the brachials immediately 

 following more or less oblong; centrodorsal ranging in shape from discoidal to conical but the 

 individual cirrus sockets never flanked by prominent ridges laterally; basals rarely visible at 

 all in the adult and radials usually inconspicuous; only one or two proximal pinnules absent, 

 if any, and that rarely. 



6 1 . Second post-radial ossicle always axillary (Cosmopolitan, 0-5220 meters) ..ANTEDONIDAE (p. 39) 



t 2 . No axillaries, each radial (of which there may be 5 or 10) being followed by an undivided series of 



brachials (Antarctic ; Indo- West Pacific, South Africa, North Atlantic, 254-3290 meters). 



PENTAMETROCRINIDAE (p. 76G) 



a 2 . First syzygial pair very obliquely wedge-shaped, and the immediately following brachials tri- 

 angular; centrodorsal always high conical, usually with pairs of prominent ridges or a continuous 

 horseshoe-shaped ridge corresponding to each cirrus socket (absent in Sibogacrinus) ; basals 

 still visible in the adult and radials large, except in the 5-armed Atopocrinus, the other genera 

 having axillaries and 10 arms; at least nine of the proximal pinnules lacking (again except in 

 Atopocrinus, while the condition is unknown in Sibogacrinus) (East Indies to the Hawaiian 

 Islands and from the West Indies and northeast Atlantic, 532-1633 meters). 



ATELECKINIDAE (p. 811) 



Family ANTEDONIDAE Norman 



Comatuladae FLEMING, History of British animals, 1828, p. 494; ed. 2, 1842, p. 494. 



Comatulidae FORBES, History of British starfishes, 1841, p. 12. D'ORBIQNT, Cours elementaire de 

 geologic et de paleontologie stratigraphique, 1852, vol. 2, fasc. 1, p. 138. W. B. CARPENTER, 

 Phil. Trans. Roy. Soc., vol. 156, 1866, p. 692. BELL, Proc. Zool. Soc. London, 1882, p. 530. 

 P. H. CARPENTER, Challenger Reports, Zool., vol. 26, pt. 60, 1888, pp. 27, 43, 63-66. 



Comatuliens (part) DUJARDIN and HUPE, Histoire naturelle des zoophytes, Echinodermes, 1862, 

 p. 191. 



Antedonidae NORMAN, Ann. Mag. Nat. Hist., ser. 3, vol. 15, 1865, p. 101; ser. 6, vol. 7, No. 40, 1891, 

 p. 386; No. 44, 1891, p. 181. BATHER, Ann. Mag. Nat. Hist., ser. 6, vol. 7, 1891, p. 464 (should 

 be applied to that comatulid family in which Antedon is placed); Natural Science, vol. 12, 1898, 

 p. 341 (relation to Pentacrinidae; formation of colummils) ; Geol. Mag., new ser., vol. 5, 1> r. 4, 1898, 

 p. 324 (systematic position); Rep. British Assoc. for 1898, 1899, p. 923 (includes Thiolliericrinus, 

 Eudiocrinus, Promachocrinus; referred to Grade Pinnata of Order 2, Flexibilia, of Sub-Class 

 Dicyclica); in Wachsmuth and Springer's Monograph on crinoids, 1899, p. 324 (systematic 

 position); in Lankester, A treatise on zoology, pt. 3, Echinoderma, 1900, pp. 125, 136, 141, 

 195. DODERLEIN, Fauna Arctica, vol. 4, Lief. 2, 1905, p. 397 (represented in thr Arctic by 

 Antedon). A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 344 (includes Eudio- 

 crinus, Anlcdon and Thiolliericrinus; part of Comatulidae as understood by P. II. Carpenter); 

 Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126 (covering Erythromctra, Thanmntontrtra, Cocco- 

 metra, Trichometra, Bathymetra, Hypalometra and Iiometra geh. nov.), p. 136 (including Peromelra, 

 Erythrometra, Zenometra, Psathyromctra, Adelometra, Heliometra, Promachocrinus, Thaumato- 

 metra, Thysanomctra, Coccometra, Leptometra, Hathrornclra, Iridometm, Trichomelra, Bathymetra, 

 Nanomctra, Compsometra, Hypalometra, Isometra and Antedon); Proc. U.S. Nat. Mus., vol. 34, 



