PLYMOUTH MAKINE INVERTEBRATE FAUNA. 209 



[ Echinoderma — contd. ] 



Ampliiuridse. 



Ophiocnida BRACHiATA (Montagu) : F. J. Bell, Catal. Brit. Echinod. 

 Brit. Mus., p. 116, fig. 



Common in muddy sand on a Zostera bed S. of Batten Castle 

 (E.J.A., K.A.T., S.P.): Jennycliff B., single spec, (r.a.t.). 



Amphiura Chiajii, Forbes : F. J. Bell, Catal. Brit. Ecbinod. Brit. Mas., 

 p. 117 : two mouth papilhe on each side, two tentacle scales, 5-8 

 arm spines. 



Millbay Ch., single spec. (r.a.t.) : 2 m. S. of the Breakwater, 

 single spec, (e.j.a.). 



Amphiura elegaxs (Leach): F. J. Bell, Catal. Brit. Echinod. Brit. Mus., 

 p. 119: three moutli papilla on each side, two tentacle scales. 



Common at most stations in the Sound, L.W.-20 fms. (S.P.) : 

 liame-Eddystone Gds., 27 fms., single spec, (r.a.t.) : Yealm K. (s.P.). 

 Breeding: May-Sept. (w.G.). 



Amphiura filiformis (0. F. Miiller): F. J. Bell, Catal. Brit. Echinod. 

 Brit. Mus., p. 119: two mouth papilla on each side, no tentacle 

 scales, arms very long. 



Single spec, 2 m. AV.S.W. of the Eddystone (e.j.a.). 



Ophiactis Balli (Thompson): F. J. Bell, Catal. Brit. Echinod. Brit. 

 Mus., p. 124. 



Common, but rather local, 15-35 fms., in crevices of rock and 

 stones and on Chcdopterns tubes (s.P.) : Millbay Ch. and Pit, not 

 uncommon (r.a.t., s.P.) : Asia Sh. (t.V.IL, s.P.) : Mewstone Gds.; 

 liame-Eddystone Gds. (r.a.t., s.p.) : abundant around the Eddy- 

 stone (e.j.a.) : Stoke Pt. Gds., not uncommon (s.P.). 



Gonads ripe : Sept. (s.P.). 



Ophiocomidae. 



Ophiocoma nigra (0. F. Miiller) : E. Forbes, Hist. Brit. Starf., p. 50, tig. 

 (as 0. fjranulata). 



This form is almost invariably found associated with OpJiiothrix 

 fi'iKjilis, but is generally far less abundant tban the latter species, 

 although occasionally it is the predominant form ; at most stations 

 the specimens are brilliantly coloured, but sometimes, as on the 

 Mallard Sh., it is possible to get a pure gathering of the typical 

 black form (s.P.) : Mallard Sh., in abundance together with Antcdon 

 (w.G., s.P.) : Millbay Pit, common ; Mewstone ' Echinoderm ' Gd. 

 (r.a.t., s.P.) : Eddystone Gds., occasional specs, on stony and rocky 

 ground, 15-30 fms. (e.j.a., s.p.): Rame-Eddystone Gds.; Stoke Pt. 

 Gds. ; not uncommon but very local (s.P.). 



Gonads ripe : Apr. ; July. Spent individuals, Sept. (s.P.). 



Ophiopsila aranea, Forbes: A. E. G-ruhe, Die Insel Lussin (Brgslau, 

 1864), p. 104. 



Mewstone Ledge, not uncunnnon in rock crevices (e.j.a., r.a.t., 

 S.P.) : Stoke Pt. Gds., fairly common in crevices of the local red 

 rock, especially in old Pholadiilea crypts, 15-25 fms. (s.P.). 

 Gonads ripe in Aug. (r.a.t.). 



