248 rLY.MOUTII MAKINE INVEIITEBRATE FAUNA. 



[ Schizopoda — contd.] 



Macromysis flexuosa (Mlillei) and M. NiGiiA : K Kcchlc & Gamble, 

 Phil. Trans. Eoy. Soc, ser. B., vol. cxcvi, p}). 332, etc., fig. 



Tof,'ether these two species include, but they do not respectively 

 coincide with, the Macrom^/sis Jlrxnom and M. nrrilrda of Sars and 

 of Norman. Both are known to occur in the Plyniouth area, but 

 they have only been quite lately differentiated, and consequently 

 their distribution has not yet been fully determined. The evidence 

 at pre.sent available points to the conclusion that M. flexuosa is 

 essentially an estuarine form, and M. nujra more strictly marine. 

 This is in agreement with the experience of Gamble. The Macro- 

 mysis which swarms about the shores of the Tamar at Saltash 

 (especially in the summer months) appears to be exclusively 

 M. flexuosa. In Plymouth Sound M. iivjra is the predominant 

 form ; it occurs commonly in the shallows, especially in Cawsand 

 Bay; but M. flcanwsa has been found in small numbers also. Both 

 species are known to occur in the P. Ycalm. M. nigra has been 

 found in AVhitsand Bay once (w.i.B.). 



Macromysis inekmis (Pathke): G. 0. Sars, Carcino]. P,idr. Norses 

 Fauna, Mysider, Pt. iii, p. 54, fig. 



Plymouth, 1889 (a.m.n.) : Sept. 1892 (w.g.): 1898: Cawsand B., 

 Bigbury B. in July (w.i.B.): 1899; Cawsand B. ; Jennycliff B. ; 

 Bovisand B. ; Whitsand P). : Ycalm Est. among decaying Zostera 

 few specs., Feb.-Oct. : Apr. 1900 (w.i.B.). 



Breeding : Apr. ; Oct. (w.i.B.). 



ScHiSTOMYSis arenosa: G. 0. Sars, Arch. Math. Naturvid., vol. i, p. IG, 

 fig. (as 3li/sls). 



Cawsand B. : 1893 (w.g.): Feb. 1899, four specs.; Apr. 1900, 

 single spec. (w.i.B.). Whitsand B. : 1892-3 (w.g.): 1896 (t.v.ii.) : 

 Oct. 1899 (W.I.B.) : May 1903, several specs. (s.P.). Bovisand B. : 

 Yealni Est., on sand with decaying Zostera; Oct. 1899 (w.i.B.). 



Breeding : June (w.g.) : Oct. (w.i.B., r.a.t.). 



SCHISTOMYSIS ORNATA (Gr. 0. Sars) : G. 0. Sars, Carcinol. Bidr. Norges 

 Fauna, Mysider, Pt. iii, p. 62, fig. (as Jh/sis). 



Pt. Tamar, Saltash: Mar. ;"l)ec. ; 'l899 (w.i.B.): Feb. 1901 

 (W.I.B. & R.A.T.). 3 ni. S.W. of llame Hd., few specs. Aug. 1898 

 (e.w.l.h. & W.I.B.): liame-Eddystone Gds. : Mewstone Gds. etc.; 

 several specs. Mar. -Nov. 1899 ( w.i.B.). 



Breeding : Feb. ; Apr. ; Oct. (w.i.B., r.a.t.). 

 SCHISTOMYSIS Parkeri : A. M. Norman, Ann. Ma^. Nat. Hist., ser. 6, 

 vol. X, ]). 256, fig. 



Whitsand B., 1896 (t.v.h.) : Tregantle, 1897 (e.w.l.h.). 

 SCHISTOMYSIS spiritus, Norniau : G. 0. Sars, Carcinol. P.idr. Norges 

 Fauna, Mysider, Pt. iii, p. 58, fig. (as 3L/sis). 



Whitsand B.: abundant July 1892 (w.G.): 1897 (E.W.L.H.): Aug. 

 1898, abundant (E.W.L.H. & w.LB.): May 1903 (s.P.). Cawsand B., 

 single specs, in Fel». and Apr. 1899 (w.t.b.). 3 m. S.W. of Pame 

 Hd., Aug. 1898 (E.W.L.H. & w.i.i!.). 



Breeding: Apr. (w.i.b., r.a.t.): June; July; Aug., late stages 

 only (w.G.). Large individuals almost disappeared by Aug., young 

 ones numerous (w.G.). 



