Arenicola 29 



Arenicola Lamarck, 1801, emend. 

 Arenicola — 



Lamarck, Syst. Anim. s. Vert. (1801), p. 324 ; Hist. Anim. s. Vert., v (1818), 



p. 335. 

 Ashworth, Liverpool Mar. Biol. Comm., Mem. xi (1904), p. 71 ; Proc. U.S. 



Nat. Miis., xxxix (1910), p. 2. 

 Audouin, Diot. class, d'liist. nat., i (1822), p. 534. 

 Audouin et Edwards, Ann. Sci. Nat., xxx (1833), p. 419 ; Hist. nat. Litt. 



France, ii (1834), p. 284. 

 Blainville, Diet. Sci. Nat., Ivii (1828), p. 446. 

 Bosc, Hist. nat. Vers, i (1802), p. 161. 

 Cams, Prodr. Faun. Medit., i (1885), p. 251. 



Cunningham and liamage. Trans. R. Soc. Edin., xxxiii (1888), p. 648. 

 Fleming, Encyc. Brit., 7 Edit., xi (1842), p. 219. 

 Gamble and Ashivorth, Q. J. Micr. Sci., xliii (1900), p. 540. 

 Gervais, Diet. univ. d'hist. nat., ii (1842), p. 102. 

 Johnston, Catal. Worms Brit. Mus. (1865), p. 229. 

 Levinsen, Vid. Medd. Naturh. Foreu. Kjobenhavn (1883), p. 134. 

 Lo Bianco, Atti R. Accad. Sci. Fis. Mat. Napoli, v, scr. 2, no. xi (1893), p. 9. 

 Quatrcfages, Hist. nat. Annel., ii (1865), p. 262. 

 Savigny, Syst. Annel. (1820), p. 95. 



Arenicola, partim — 



Fauvcl, Mem. Soc. Nation. Sci. Nat. Math. Cherbourg, xxxi (1899), p. 161. 



Chorizobranchus — 



Quatrcfages, oj). cit., p. 267. 



Clymenides — 



Claparede, Beobacht. Anat. wirbell. Thiere Normand. (1863), p. 80. 



Clsrmenides, partim — 



Mesnil, Bull. Sci. France Belg., xxx (1897), p. 148. 



Lumbricus, partim — 



Linnaeus, Syst. Nat., x Edit.,i (1758), p. 647 : xii Edit., i, 2 (1767), p. 1076. 



Adult. — Arenicolidae usually found burrowing in sand ; pairs of 

 branched gills are borne dorsally on the chaetiferous annuli of a 

 number of the segments, in the caudate species on all except the 

 first six, and in the ecaudate species from the twelfth or sixteenth 

 usually to the last. Prostomium small, bounded posteriorly by the 

 nuchal invagination. Each chaetiferous segment, exce})t the fh-st 

 three or four, is subdivided usually into five annuli, that which bears 

 the parapodia being larger than the others. Each parapodium consists 

 of a conical notopodium bearing capillary chaetae, and a neuropodium 

 in the form of a muscular ridge, traversed by a deep groove, in 

 which a row of crotchets is situated. In some species there is a 

 posterior " tail," composed of achaetous segments. There is a pair of 

 hearts a short distance behind the oesophageal glands. The first 

 nephridium opens on the fourth or fifth segment, the dorsal lip of 



