106 OPHIUROIDEA. 
OPHIUROIDEA (see p. 24). 
ZY GOPHIUE AE (see p. 25). 
OPHIOLEPIDID/ (see p. 25). 
Key to Genera of Ophiolepididee. 
Bursal slits extend from mouth-plate to edge of 
disk’, \...n teas tery oer the ers on eee OpnivRa, p. 106. 
Bursal slits lessoxtemsive ee ieee cee ae OputrocreEn, p. 118. 
Incerte@ sedis. 
Disk with fine imbricated scales.............. OpuiocHiTON, p. 114. 
1. OPHIURA. 
Ophiura, Lamk. An. s. Vert. 11. (1816) p. 540; Agass. Mém. Soc. 
Neuch. i. (1836) p. 192 ; Forbes, Mem. Wern. Soe. viii. (1859) p, 125 ; 
id. Brit. Starf. (1840) p.22; Norman, Ann. § Mag. xv. (1865) p. 112; 
Bell, Ann. § Mag. H. H. viii. (1891) p. 389. 
Ophiolepis, M. Tr. Syst. Ast. (1842) p. 89 (pars). 
Ophioglypha, Lyman, Ill. Cat. M. C. Z. 1. (1865) p. 40; td. Chall. 
Rep. Oph. (1882) p. 34. 
No tooth-papilli ; teeth ; mouth-papille 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. O. 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. OJ sarst. 
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. Mill. Zool. Dan. (1776) p. 235, 
Asterias ciliaris, Linn. S. N. xii. (1766) p. 1101 (non M. Houttuyn, 
Nat. Hast. xiv. (1770) p. 470, pl. exit. 5). 
Asterias ciliata, Retz. Vet.-Akad. Hdly. iv. (1783) p. 289; 7d. Diss. 
Spec. Ast. (1805) p. 29. 
Ophiura ciliata, Nelss. Coll. Zool. Scan. (1817) p. 14. 
Ophiolepis ciliata, M. Tr. Syst. Ast. (1842) p. 91; Gray, Brit. Rad. 
_ (1848) p. 23. 
Ophioglypha ciliata, Ljungman, Gifv. Vet.-Ak. Forh. 1871 (1872), 
p- 651; Lyman, Chall. Rep. Oph. (1882) p. 76; Fjelstrup, Zool. 
Dan. Pigh, (1890) p. 22, pl. i, fig. 1. 
Asterias lacertosa, Penn. Brit. Zool. (1777) p. 53. 
