10G OPHIUKOIDEA. 



OPHIUROIDEA (see p. 24). 



ZYGOPHIURsE {see p. 25). 



OPHIOLEPIDIDvE (see p. 25). 



Key to Genera of Ophiolepididge. 



Bursal -slits extend from mouth-plate to edge of 



disk Ophiura, p. 106. 



Bursal slits less extensive Ophiocten, p. 113. 



Incertm sedis. 

 Disk with fine imbricated scales Ophpochiton, p. 114. 



1. OPHIURA. 



Ophiura, Lamk, An. s. Vert. ii. (1816) p. 540; Agass. Mem. Soc. 



Neuch. i. (1836) p. 192 ; Forbes, Mem. Wern. Sue. viii. (1839) p. 125 ; 



id. Brit. Starf. (1840) p. 22 ; Norman, Ann. 8f Mag. xv. (1865) p. 112 ; 



Bell, Ann. $ Mag. H. H. viii. (1891) p. 339. 

 Ophiolepis, M. Tr. Syst. Ad. (1842) p. 89 (pars). 

 Ophioglvpha, Lyman, III. Cat. M. C. Z. i. (1865) p. 40; id. Chall. 



Rep. Oph. (1882) p. 34. 



No tooth-papillae ; teeth ; mouth-papilla; often numerous. Naked 

 radial shields often large ; disk-scales rosulated. Arm-spines solid, 

 smooth, and short. Disk notched for insertion of arm, and notch 

 spinose. Bursal slits extend from mouth-plate to edge of disk. 



Key to the Species. 



The arm-notch fringed by more than 25 spines 1.0. ciliaris. 



The arm-notch fringed by less than 20 spines. 



a. Mouth-plate as broad as long 2. O. albida. 



b. Mouth-plate longer than broad 3. O. sarsi. 



The arm-notch fringed by 7 or 8 short spines 4. O. robusta. 



The arm-notch fringed by very minute spines 5. O. signata. 



Small in size, with about 10 spines 6. O. affinis. 



No comb of spines above base of arm 7. O. aurantiaca. 



1. Ophiura ciliaris. 



Asterias ophiura, Linn. S. N. x. (1758) p. 662 (non Linn. S. N. xii. 



(1766) p. 1100) ; O. F. Mall. Zool. Dan. (1776) p. 235. 

 Asterias ciliaris, Linn. S. N. xii. (1766) p. 1101 (non M. Houttuyn, 



Nat. Hist. xiv. (1770) p. 470, pi. cxiii. 5). 

 Asterias ciliata, Retz. Vet.-Akad. Hdlg. iv. (1783) p. 239 ; id. Diss. 



Spec. Ast. (1805) p. 29. 

 Ophiura ciliata, Nilss. Coll. Zool. Scan. (1817) p. 14. 

 Ophiolepis ciliata, M. Tr. Syst. Ast. (1842) p. 91 ; Gray, Brit. Had. 



(1848) p. 23. 

 Ophioglypha ciliata, Ljungman, CEfv. Vet.-Ak. Fbrh. 1871 (1872), 



p. 651 ; Lyman, Chall. Rep). Oph. (1882) p. 76 ; Fjelstrup, Zool. 



Dan. Pigh. (1890) p. 22, pi. i. tig. 1. 

 Asterias lacertosa, Penn. Brit. Zool. (1777) p. 53. 



