NEREIS (ALITTA) VIRENS. 331 



enlarged, and the hind lamellae of the inferior division also enlarged. The ventral cirrus, 

 further, has small leaf -like flaps on its thickened base. 



Synonyms. 



1835. Nereis virens, M. Sars. Beskrivelser, p. 58, Tab. x, f. 27. 



1851. „ „ Grube. Earn. Annel., pp. 49 and 127. 



1853. „ grandis, Stimpson. Synops. Grand Manan, p. 34, f. 24. 



1865. Alitta virens, Kinberg. Of vers. Vet.-Akad. Forh., p. 172. 



„ ,, „ Malmgren. Nord. Hafs-Annul., p. 183. 



„ Nereis Yankiana, De Qnatrefages. Annel., i, p. 553, pi. xvii, f. 7, 8. 



„ „ virens, idem. Ibid., p. 555. 



1867. Alitta „ Malmgren. Annul. Polycli., p. 56, Tab. iii, f. 19. 



1868. Nereis „ Ehlers. Borstenw., ii, p. 559, Taf. xxii, f. 29—32. 

 ,, ,, grandis, Packard. Americ. Nat., ii, p. 275. 



1874. Alitta virens, Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 199. 



1875. „ „ idem. Invert, and Fishes St. Andrews, p. 123. 



1876. Nereis „ Trumbull. Trans. Conn. Acad., iii, p. 265, pis. 42— 44. 

 1879. Alitta „ Webster. Trans. Albany Inst., ix, p. 35. 



„ Nereis ,, Tauber. Annul. Danic, p. 100. 



„ „ (Alitta) virens, Verrill. Check List, U.S. Comm. P. & F., p. 8. 



„ „ virens, idem. Invert. Yiny. Sound. Ibid., p. 591, pi. xi, f. 47 — 50. 



1881. Alitta virens, Leslie and Herdman. Proc P. Pliys. Soc, Bdinb., vol. vi, p. 274. 



1883. Nereis „ Levinsen. Yidensk. Meddel. Foren. Kjobenli., p. 233. 



1884. „ „ Webster and Benedict. Rep. U.S. Comm. F. & F., p. 717. 



1891. „ (Alitta) virens, Hornel. Trans. Biol. Soc. Liverp., vol. v, p. 243. 



1892. „ virens (eyes), Andrews. Journ. Morph., p. 177, pi. ix, f. 3. 



1893. „ „ Levinsen. Yidensk. Ud. ' Hauclis.,' p. 329. 



1901. „ „ Johnson. Proc. Bost. Soc. Nat. Hist., vol. xxix, No. 18, p. 398. 

 „ „ „ Whiteaves. Geol. Surv. Canada, No. 722, p. 81. 



1902. „ „ Mcintosh. Ann. Nat. Hist., ser. 7, vol. x, p. 257. 



Habitat. — Small specimens from 10 in. to a foot occur in great numbers along with 

 Nephthys in muddy sand on the north side of the pole at the West Hocks, St. Andrews. 

 They are found at various parts of the coast — both east and west — in similar localities. 

 Larger specimens are procured to the east of the Step-rock in the same line of sand. Very 

 large epitokous examples, again, are tossed on the West Sands at St. Andrews after storms 

 in October and April, especially the latter month, as well as in May (E. M.). Shore of 

 the Mersey estuary (Benham). Aberdour (Leslie and Herdman). 



Norway (Sars). East coast of N. America (Ehlers). Virginian coast (Webster). 

 Puget Sound, Pacific (Johnson). 



Head (Plate LXI, fig. 2) of the typical outline, with two short tentacles anteriorly. 

 Eyes arranged in a trapezoid behind the anterior triangle ; anterior pair wider apart ; 

 often with lenses. The longest tentacular cirrus is the dorsal of the second pair. Colour, 

 bluish-purple. 



Body of 100 — 173 segments or more, from 1 to 3 ft. in length, and If in. in 

 breadth across the feet, slightly diminished anteriorly, whilst posteriorly it gradually 

 tapers, the feet being proportionally broader, and terminates in an anal segment and 



