268 ART. 2.— H. MATSÛMOTO : 



capensis Bell, 1905, Ophiura leptoctenîa Clakk, 1911, 0. mlcra- 

 cantlia Claek, 1911, 0. quadrlspina Oi.kkk, 1911, 0. hatliylia Clark, 

 1911, Ophioden o'ôplax Claek, 1911 ; (2) species with flat and 

 squarish genital papillae and comb papillae, such as Ophioglypha 

 multisplna Ljungman, 1866, 0. lymani Ljungman, 1870, 0. irromta 

 Lyman, 1878, 0. undulata Lyman, 1878, 0. costata Lyman, 1878, 0. 

 albata Lyman, 1878, 0. jejima Lyman, 1878, 0. loveni LY3^L\N, 1878, 

 0. fraternel Lyman, 1878, 0. rugosa Lyman, 1878, 0. ambigua 

 Lyman, 1878, 0. tenera Lyman, 1883, 0. falcifera Lyman, 1883, 

 0. verrucosa Studee, 1883, 0. aspera Kœhlee, 1898, 0. plana 

 LüTKEN & MoETENSEN, 1899, 0. ckmeus Kœhlee, 1904, 0. concreta 

 Kœhlee, 1901, 0. mundata Kœhlee, 1906, Ophiura monostœcha 

 Claek, 1911, 0. atacta Claek, 1911, 0. calyptolepis Claek, 1911, 

 0. cryptolepis Claek, 1911, 0. paucisquama, nov. and others. 



OpJiionotus, OpUoperla and Ophiotjalfa are very close to the 

 present genus — especially to the ojjhiura-group. Ophionotus may be 

 defined as ophlura-iovms, with supplementary dorsal arm plates ; 

 Opliioperla as the same with superficial granulations on the disk ; 

 and Ophiotjalfa as the same without genital papilla? or arm 

 combs. 



Key to Japanese species of Oiihiiira, 



A. — Genital papillse, as well as comb papillae, spiniform, acute, both or 

 at least the latter being well spaced ; second oral tentacle x^ore 

 opening more or less within the oral slit. 

 B. — Arms flattened, much wider than high at the free arm base ; arm 



spines rather long and stout opJdura-gvom^ (I). 



a. — Arm combs well developed, rather large in dorsal view. 

 b. — Three arm spines ; oral shields wider within than without, 

 c. — Disk scales naked ; arm spines not spatulate. 



