112 ART. 2. — H. MATSUMOTO : 



jj — Oral shields not very wide, with rounded lateral angles ; tentacle 

 scales oval, flat, bluntly pointed adiapJiora. 



ee — Ten or eleven arm spines ; stumpy tubercles of the disk very, short ; 

 oral shields wide ; tentacle scales large, long, acute ancMlahra. 



dd — Disk covered only with spines. 



h — Three oral papillae on either side ; no spines along the outer border 

 of basal dorsal arm plates. 



I — Disk spines smooth ; outermost oral papilla very long and spiniform ; 



eight or nine arm spines ; tentacle scales conical, acute 



lophohracliia. 



II — Disk spines rough ; outermost oral paj)illa flat and clavate ; ten or 

 eleven arm spines ; tentacle scales long and flat acanthinotaia. 



kk — Six oral papillae on either side ; a row of spines present along the 

 outer border of basal dorsal arm plates ; eight arm spines ; tentacle 

 scales acute inutilis. 



cc — Disk covered with granules ; seven or eight arm sj)ines ; tentacle 

 scales large hiderdata. 



bb — Arm spines serrate. 



m — Oral papillae and tentacle scales smooth. 



n — Disk covered with fine scales and sparsely beset with rough, stout 

 spines ; six arm spines .prionota. 



nn — Disk covered with thorny, stumpy tubercles, among wliich several 



long, thorny spines are mingled ; nine arm spines diploa. 



mm — Oral papilla and tentacle scales rough; disk tubercles ending with 

 a thorny crown ; six to eight arm spines o rhachôpîiora. 



act —Two tentacle scales to each pore ; disk covered with fine granules ; 



six arm spines, flattened, smooth hisquamata. 



A A — Oral papillae not arranged in a single series, but the outer ones 

 clustered around the second oral tentacle pore ; disk co%'ered with 

 short, granule-like spines ; twelve serrate arm spines ; single tentacle 

 scale to each pore rosea. 



