PLYMOUTH MAEINE INVERTEBRATE FAUNA. 275 



[ Prosobranchiata — coittd.] 



Trophon muricatus (Montagu): K Forhes & Hanley, Hist. Brit. Moll., 

 vol. iii, p. 439. 



Occasionally taken in 15-30 fnis. ; not miconnnon on the Mew- 

 stone ' Echinoderm ' Gd. (r.a.t.). 



Purpura lapillus (Liunteus) : J. G. Jeffreys, Brit. Conch., vol. iv, 

 p. 276, fig. 



Abundant on rocks between tide-marks everywhere (s.P.). 

 Spawn: Jan. -Apr. (w.G., R.A.T.) : May (w.G.) : July (s.P.): Nov. 

 (W.G.). 



Nassidae. 



Nassa reticulata (Linnojus): E. Forhes (£■ HrmJcy, Hist. Brit. Moll., 

 vol. iii, p. 388, fig. 



More or less conunon everywiiere, L.W.-5 fms., especially on 

 muddy sand ; Cawsand B. ; Jeunycliiff B. ; Drake's I. ; Yealm R. ; 

 etc. (s.P.). 



Breeding: Feb. (w.G.): Mar. (w.G., r.a.t., s.p.): Apr. (w.G., r.a.t.): 

 May (s.P.) : June (r.a.t., s.p.) : July (w.G.): Aug. (s.P.): Sept. (w.G.). 



Nassa incrassata (Strom): E. Forbes & Rrinley, Hist. Brit. Moll., 

 vol. iii, p. 391, fig. 



More or less commcn oii all rocky shores, gregarious under 

 stones and in crevices, particularly where there is a certain amount 

 of silt, L.W.-10 fms. (s.P.). 



Breeding: Fel).-Mar. (s.P.): Apr. (w.G., R.A.T., S.P.) : June (w.G.): 

 Aug. (w.G., S.P.) : Sept. (w.G.). 



Pleurotomidse. 

 Mangilia attenuata (Montagu): J. G. Jeffreys, Brit. Conch., vol. iv, 

 p. 377, fig. (as Pleurotoma). 



Occasionally in muddy gravel, 20-30 fms. (s.P.). 



Mangilia nebula (Montagu): E. Forhes & Hanley, Hist. Brit. Moll., 

 vol. iii, p. 476, fig. 

 Queen's Gd. (r.a.t.^). 



Mangilia (Bellardiella) gracilis, P. Fischer: J. 0. Jeffreys, Brit. 

 Conch., vol. iv, p. 363, fig. (as Defrevnciei). 



Not uncommon, 20-35 fms., particularly on muddy gravel (s.P.). 

 Clatiiurella linearis (Montagu): J. G. Jeff'reys, Brit. Conch., vol. iv, 

 p. 368, fig. (as Defraneifi). 



Queen's Gd., not uncommon; Asia Sh. : occasionally on the out- 

 side grounds, 15-30 fms. (r.a.t., s.p.): the Breakwater, occasionally 

 (R.A.T.). 

 Clathurella purpurea (Montagu) : ,/. G. Jeffreys, Brit. Conch., vol. iv, 

 p. 373, fig. (as Defrrnirici). 



Occasionally under stones and in rock crevices, L.W.-5 fms. ; 

 Drake's I.; Asia Sh.; Hollow Piock B., JennyclilT B. ; Blackstone 

 Rks., Wembury B. ; etc. (s.P.). 

 Breeding: Nov. (s.P.). 



Clathurella reticulata (Penier) : /. G. Jeffreys, Brit. Conch., vol. iv, 

 p. 370, fig. (as Defrrineia). 



Occasionally, 15-30 fras. (s.P.). 



