1915.] NATURAL SCIENCES OF PHILADELPHIA. 81 



separated from each other, sometimes more or less joined in pairs. 

 Second oral tentacle pores open nearly or entirely outside oral slits, 

 very large, beset with numerous scales. Genital papillse, and usually 

 also arm combs, present. Arms low, often flattened. Dorsal arm 

 plates usually well developed and in contact with each other. Lateral 

 arm plates low, those of the two sides being in contact with each 

 other below. Three or more arm spines of variable length. Ten- 

 tacle pores of one or two innermost pairs large and beset with rather 

 numerous scales, but those beyond very small and beset with a few 

 scales. 



This genus, as here restricted, includes Asterias ciliata Retzius and 

 the following species with spiniform genital and comb-papillse : 

 Ophiura albida Forbes, Ophiolepis robusta Ayres, Ophiura sarsii, 

 ardica, carnea, and affinis of Llitken, 0. kinhergi Ljungman, 0. 

 hexadis and hrevispina of Smith, 0. acervata, inermis, papillata, 

 flagellata (= Gymnopkiura coerulescens Llitken and Mortensen), 

 imbecillis, lepida, (Bqualis, Ijungmani, and mendionalis of Lyman, 

 0. aurantiaca Verrill, 0. maculata Ludwig, 0. amphifrites Bell, 

 0. indica Brock, 0. thouleti Koehler, Ophiozona capensis Bell, Ophiura 

 leptodenia, micracantha, quadrispina, bathybia and Ophioden ooplax 

 H. L. Clark; also the following species with blunt and flat genital 

 and comb papillae, Ophioglypha midtispina and lymani Ljungman, 0. 

 lutkeni, irrorata, undata, costata, albata, jejuna, loveni, fraterna, rugosa, 

 inornata, confragosa, intorta, ambigua, abyssorum, tenera and falciiera 

 of Lyman, 0. verrucosa Studer, 0. inflata, demens, concreta, mundata 

 and aspera of Koehler, 0. plana, scutellata, nana and obteda of Llitken 

 and Mortensen, 0. tessellata Verrill, Ophiura dasta, tnonostcecha, 

 atada, calyptolepis and cryptolepis of H. L. Clark. 



Ophionotus, Ophioperla and Ophiotjalfa are very close to the 

 present genus — especially to the typical group with spiniform genital 

 and comb papillse and with rather long arm spines. Ophionotus 

 may be defined as typical Ophiura with supplementary dorsal arm 

 plates; Ophioperla as Ophiura with granulated disk; and Ophio- 

 tjalfa as Ophiura without genital papillae and arm combs. 



SubfamUy 2. OPHIOLEPIDIN^ nov. 



(Characters as given in key, p. 75.) 



This subfamily includes Ophiomusium, Ophiolipus, Ophiophyllum, 

 Ophiopenia, Ophiocrates, Ophiomidas, Ophiothyreus, Ophiozona, Ophio- 

 ceramis, Ophiolepis and Ophioplocus, besides a new genus, Ophio- 

 zonella, which is separated from Ophiozona. 

 6 



