rLYMOUTir MAKIXE IXVERTEBUATK FAUNA. 269 



[ Prosobranchiata — contiJ.'\ 



FissuRELLA GE.ECA (Liniui3us) : E. Forhes & Hanky, Hist. lirit. Moll., 

 vol. ii, p. 469, tig. (as F. rcticidata). 



Occasional specs, on all rocky stations, L.W.-l f ms. (s.P.) : 

 occasionally between tide-marks ; the Breakwater ; IJcny iJks. ; 

 the Mewstone ; Church lieef, Wembury B. ; not nnconimon in 

 dredgings from the Yealm E. (r.a.t.). 



Trochidae. 



EUMARGARITA GRCENLANDICA (Chemnitz): E. Forhcs tC- Hanlcij, Hist. 

 Brit. JNIoll., vol. ii, p. 528, fig. (as Trochus undulatus). 



A single specimen, possibly merely an empty shell, 3 m. S.W. 

 Penlee Pt. (r.a.t.). 

 GiBBULA CINERARIA (Llnnanis): E. Forbes tl; Hanky, Hist, lirit. Moll., 

 vol. ii, p. 516, fig. (as Troclius). 



Abundant nearly everywhere, between tide-marks-10 fms., under 

 stones, on Zodrra, Fucus, etc. (s.P.). 

 Gibbula magus (Linnreus): J. G. Jeffreys, Brit. Conch., vol. iii, p. 305, 

 fig. (as Troehns). 



Uncommon at Plymouth, occurring only on coarse shell-sand or 

 gravel; Queen's Gd. ; between the Knap and Panther lUioys, four 

 very large specs. (s.P.) : Millbay ' shell-gravel ' Gd. ; Mewstone 

 ' Ainphioxus' Gd. (r.a.t.). 

 Gibbula tumida (Montagu) : E. Forhcs c5 Hanky, Hist. Brit. Moll., 

 vol. ii, p. 513, fig. (as Trochus). 



Occasional specs, from the Pame-Eddystone, Eddystone, Stoke 

 Pt., and other outside grounds (s.P.). 

 Gibbula umbilicata (Montagu): E. Forbes & Hanky, Hist. Brit. Moll., 

 vol. ii, p. 519, fig. (as Trochus). 



Common at most stations, but not so abundant as G. cineraria, 

 and occurs at a rather in"gher level, H.W.-3 fms. (s.P.). 

 MoNODONTA CRASSA (Moutfort) : J. G. Jeffreys, Brit. Conch., vol. iii, 

 p. 317, fig. (as Trochus lineatus). 



The distribution of this species at Plymouth appears to be a very 

 liu)ited one, but it is met with in some numbers upon restricted 

 areas of the rocks, at and above high-water mark, at tbose stations 

 where it occurs ; N.E. Drake's T. ; Blackstone Kks., Wembury B. ; 

 Yealm Sand-bank (s.P.). 

 Callfostoma granulatum (Born): E. Forbes & Hanky, Hist. Brit. 

 Moll., vol. ii, p. 499, fig. (as Troelms). 



Moderately common on sandy gravel, 20-30 fms. (s.P.) : Mew- 

 stone 'Echinoderm' Gd., common (r.a.t.): Pkldystone Gds., on gravel 

 with sand or muddy sand (e.-T.a.). 

 Calliostoma striatum (Linn;vus): E. Forbes clj Hanky, Hist. Brit. 

 Moll., vol ii, p. 508, fig. (as Trochus). 



Occasionally; Caw.sand B. ; Jennycliff B. ; Yealm Est., common 

 on Zostera (r.a.t.). 

 Calliostoma zizvpiiinus (I^innnMis): E. Forhes tC- Hanley, Hist. I'rit. 

 Moll., vol. ii, p. 491, tig. (as Trochus). 



Common under stones and in crevices on all rocky shores at low 

 water; a dwarf var. is not uncommon in the deeper water of the 

 outside grounds (s.P.): Yealm P., a characteristic var. is common 

 on the sand-bank (r.a.t.). 



