A. E. Verrill — JVorth American Ojohiuroiclea. 331 



aa. — Ophioscalus Ver., 1899a, p. 42. Radial shields large, wide, 

 closely joined, naked. Disk-scales covered with rough 

 spinules. Arm-spines approximate dorsally. 



0. echinulatus Lym. Arm-spines ten, very thorny and glassy. 

 Tentacle-scales spiniform, two on the first joint. Two or three tooth- 

 papillje. 



Group C. — Ophieciodia Ver., 1899a, p. 42. 



Outer oral papilloe (oral tentacle-scales) several, forming a cluster 

 or a double row, some often standing on the lower face of the jaw 

 or adoral shield. Tooth-papillre one to three, or more. The oral 

 papillte are clustered nearly as in typical Ophiomitra. 



0. enopla Ver. Tooth-papillse, one or two. 



0. rosea Lym. Tooth-papillae clustered, three or more. 



O. spectabills Sars. Tooth-papillae thi'ee or foui*, in a cluster. 



Series II. 



Group D. — Ophialccea Ver., 1899a, pp. 38,42. Types, O. N'tit- 

 tingii (Ver.) and 0. tuberculosa (Lym.). (See p. 326.) 



The dorsal arm-plates are broadly in contact, at least on many of 

 the proximal joints. Disk-scales bear spinules or granules. Radial 

 shields separate, sometimes more or less exposed distally, sometimes 

 covered. Arm-spines rather short, few, nearly smooth, the rows not 

 approximate dorsally. Oral papillae nearly as in typical Opliia- 

 cantha (group A). 



0. JS'uttingii Ver., 1899a, p. 46. Arm-spines four, short. Oral- 

 shield very large, ovate. Disk-scales more or less exposed, bearing 

 conical spinules. 



0. rufescens Koehl. Off the Azores, 845 meters. Ventral plates 

 contiguous. Arm-spines six, finely serrulate. Two large elongated 

 tentacle-scales. Oral papillae six or seven, outer one largest. Disk- 

 scales covered with fine roundish granules. Distal end of radial 

 shields naked. 



O. tuberculosa Lym,, '98. E, Indies. Disk and radial shields 

 covered with cuticle and granules. Arm-spines four. One tooth- 

 papilla. Three oral papillae, the distal one broad and notched. Oral 

 shield not large, transverse. Tentacle-scale single, small. 



