MONOGRAPH OF JAPANESE OPHIUEOIDEA. 267 



scales, among which the primaries are usually very distinct. 

 Radial shields more or less separated from one another. Genital 

 papilhv well developed ; arm combs usually present. Second oral 

 tentacle pores opening more or less inside the oral slits, very 

 large, beset with numerous scales, some of which often form a 

 continuous row with tlie oral papilla\ Arms not very stout but 

 flat or cylindrical, uniformly tapered outwards. Dorsal arm plates 

 usually well developed, often widely in contact with one an- 

 other. Lateral arm plates low, bearing three to seven arm spines, 

 which lie flat on the arm. Ventral arm plates small, separated 

 from one another at least outside the disk. Tentacle pores of the 

 first one or two arm joints large and beset with rather numerous 

 scales ; those beyond are very small and have only one or two 

 scales. 



This genus, as now restricted, includes (1) species with spini- 

 form genital papillao and comb papilla?, such as Asterias opMura 

 Linné, 1758, Ophiura alhida Foebes, 1839, Opliiolepis robiista Ayres, 

 1851, Opldura sarsii Lütken, 1854, 0. arctica Lütken, 1854, 0. 

 curnea (Saes) Lütken, 1859, 0. aßnis Lütken, 1859, Ophioglypha 

 lütksnl LiTkiAN, 1860, 0. kinbercji Ljungman, 1866, 0. acervata 

 Lyman, 1869, 0. hrevispina Smith, 1876, 0. inermis Litvian, 1878, 

 0. papillata Lyman, 1878, 0. flagellata Lyman, 1878, 0. imhecilUs, 

 Lyman, 1878, 0. lepicla LiikiAN, 1878, 0. œqualis Lyman, 1878, 0. 

 Ijungmani Lyman, 1878, 0. meridionalis Litvian, 1879, 0. aurantiaca 

 Yeeeill, 1882, 0. maculata Ludwig, 1886, 0. amphitrltes Bell, 

 1888, 0. indica Beock, 1888, 0. thouletl Kœhlee, 1895, Ophiozona 



0. tessellata Veeeill, 1894, inflata Kœhle::. 1898, 0. divisa Lütken & Moktensen, 1899, 0. 

 nana Lütken & Mobtensen, 1899, 0. scutellata Lütken & Mortensen, 1899, 0. frigida Kœhlee, 

 1900, 0. gelida Kœhlee, 1900, Ophiozona inermis Bell, 1902, Ophioqlypha brucei Kœhlee, 1907, 

 0. mimaria Kœhlee, 1907, 0. partita Kœhlee, 19Ö7, 0. scissa Kœhlee. 1970, 0. flexïbUis Kœhlee, 

 1911, Ophiura clasta Ciaek, 1911, and Ophioglypha rouchi Kœhlee, 1912. 



