270 PLYMOUTH MAIIINE IXVEItTEBRATE FAUNA. 



[ Prosobranchiata — conl<K] 

 Turbinidae. 

 Phasianella pullus (Liiinanis): i^'. Forbes & Hanky, Hist. Brit. Moll., 

 vol. ii, p. 538, fig. 



More or less coininon everywiiere on Algte and Zostera, L.W.- 

 10 fnis. ; common among weed growing on ships'-bottoms, buoys, 

 etc. (s.P.): Queen's Gd.; Jennycliff B.; Cawsand B.; etc. (r.a.t., s.p.). 



Littorinidse. 

 Lacuna divaricata (Fabricius) : E. Furhes tC- Hanky, Hist. Brit. Moll., 

 ^ vol. iii, p. 62, fig. (as L. vincta). 



Common on Fucus-covered rocks near low-water mark (s.P.) : 

 rocks below the Hoe, large specs, moderately common : smaller 

 specs, connnon on the Zodera in Jennyclilf B., Cawsand B., and 

 Yealm Est.; 1 m. S. of the Mewstone, very occasionally (r.a.t.). 

 Breeding : Feb.-Apr. (r.a.t.). 



Lacuna pallidula (da Costa) : E. Forbes & Hanky, Hist. Brit. Moll., 

 vol. iii, p. 56, fig. 



Not uncommon on Fncus-co\evQ(\. rocks under the Hoe (r.a.t.). 

 Breeding : Feb. (r.a.t.). 



Lacuna parva (da Costa): E, Forbes & Hanky, Hist. Brit. ]\Ioll., vol. iii, 

 p. 58, fig. (as L. 2)i(teoIus). 

 Cawsand B. (r.a.t., S.P.). 

 Littorina littorea (Linnajiis): J. G. Jeffreys, Brit. Conch., vol. iii, 

 p. 368, fig. 



Not uncommon between tide-marks on most shores, but seldom 

 in any quantity ; this form occurs at a lower zone than L. ruclis 

 (s.P.): St. John's Lake, abundant; Yealm K., common (a.j.s.). 

 Breeding : Feb. (w.g.). 

 Littorina neritoides (Linna;us): /. G. Jeffreys, Brit. Conch., vol. iii, 

 p. 361, fig. 



Abundant on rocks above high-water mark (s.P.). 

 Littorina obtusata (Linn?eus) : J. G. Jeffreys, Brit. Conch., vol. iii, 

 p. 356, fig. 



Abundant everywhere on Fucks, Zostera, etc. (s.r.). 

 Breeding : Feb. ("W.G.) : Mar. (s.P.). 



Littorina rudis (Maton): J. G. Jeffreys, Brit. Conch., vol. iii, 

 p. 364, fig. 



Very abundant on all rocky shores near high-water mark (s.P.). 



Bissoiidae. 

 RiSSOlA PARVA (da Costa) : E. Forbes cO Hanky, Hist. Brit. Moll., vol. iii, 

 p. 98, fig. 



Moderately common in the Sound l)etween tide-marks; occasion- 

 ally in dredgings from Millbay Ch., Asia Sh., etc. (r.a.t.). 

 Alvania cancellata (da Costa) : E. Forbes & Hanky, Hist. Brit. Moll., 

 vol. iii, p. 80, fig. (a*^ Jiissoa crennhitn). 

 Dead shells only (k.a.t.). 

 Alvania reticulata (Montagu) : E. Forbes & Hanky, Hist. Brit. Moll., 

 vol. iii, pp. 82 and 84, fig. (as Rissoa cakithvs and R. Beanii). 

 Dead shells only (h.a.t.) 



