76 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Subfamily 1. OPHIOMASTIN.E nov. 



(Characters as given in key p. 75.) 



This subfamily includes Ophiomastus, Ophiotypa, Ophiomisidium, 

 Ophiophycis, Anthophiura, Ophiopijrgus, Ophiochrysis, Ophiosteira, 

 Gyninophiura, Ophiura, Ophionotus, Ophioperla, Ophiotjalfa, Ophio- 

 gona, Ophioplinthiis, Ophiopleura, Ophioden and provisionally 

 Astrophiura, besides five new genera, Haplophiura, Aspidophiura, 

 Am.phiophiura, Stegophiura and Ophiurolepis. 



Koehler's recently described genus Ophiomisidium includes Ophio- 

 musium pulchellmn Wyville Thomson, 0. flahellum Lyman, and 

 0. speciosum Koehler, the last being the genotype. The group 

 ■evidently stands between Ophiomastus and Ophiophycis in systematic 

 position. 



HAPLOPHIURA gen. nov. 



Disk high, much elevated above arms, covered above with plates 

 'and scales, among which the primaries are very prominent, and 

 below with close-set, fine granules. Radial shields stout, joined 

 in pairs. Oral papillae soldered together. Genital plates and 

 scales present, but invisible in external view. Genital bursas absent 

 and genital slits invisible. Arms short, low, wider than high, covered 

 with convex arm plates. Tentacle pores, including second oral 

 ones, which open entirely outside oral slits, naked, being free from 

 scales. Arm spines few, minute. 



This new genus contains only a single species, Ophiozona gymno- 

 pora H. L. Clark. 



ASPIDOPHIURA gen. nov. 



Disk rather high, elevated above arms, flat, covered with very 

 stout primaries and radial shields, besides often a few smaller scales. 

 Ventral interbrachial areas covered by a very large plate, besides 

 very stout genital scales. Arm combs and genital papillae present. 

 Oral shields purse-shaped, with a beak-like inner process. Oral 

 papillae soldered together. Second oral tentacle pores open entirely 

 outside oral slits, slit-like, guarded by numerous small scales. Arms 

 rather short, strongly knotted, with long arm joints. Dorsal arm 

 plates very rudimentary or entirely absent. Ventral arm plates 

 small, rhomboidal or triangular. Tentacle pores present only on 

 several proximal arm joints, provided with few or no scales. Three 

 short, conical arm spines. 



This genus includes Ophioglypha minuta Lyman and 0. forbesi 

 Duncan ( = Ophiura glyptodisca H. L. Clark), besides the genotype, 



