ON A NK\V SPKCIKS OF SCLEROCHE1LUS. 307 



The two known species may l>e separated thus: 



1. Stronger chaetse prc-ent in iirst notopodium only ; tin 1 -cement which bears the 

 first iicuropodial cirrus varies from the 2.5th to the .".1st . N. minutus, p. 307. 



2. Stronger cha-tsi- are present in the first, second, and third notopodia. Init are 

 not so proportionately stout as in minutus; the iir-t aeuropodial cirrus is present on 

 the hstli to the 21st segmenl . >'. antarcticus, p. 309. 



Sclerocheilus minutus (irube. L863. 



GRUBE, Arch. f. Naturg., Jahrg. xxix. IM. i (1S63). !' SO; 'I'" 1 '- v , \'- 3 (Lussin piccolo, Crivi//.,i, 



Xeresine, all on Lus-in Island, Ailriatir). 



GRUBE, /'/ Insel /.//x.</ and i'//re J/ee/w/V<B<i, Lireslau, 1801. p. s.~i (Ncn-sim., Ciivi^a, Civile). 

 GRUBE, Abltandl. S'-h/>-*. Ges., Natuna. M't. (1868), isil'.i, pp. 105, 127 ( Saint- Vaa&t). 

 (iiiUBE. 46 Jahresfar. M,l.-t. (,V.--. (1868), 1869, p. G7 (note Oil rim). 

 ASIIWURTH, Uitfirf. Journ. Micr. >'<;/., vol. xlv (1901), pp. 293, 2'.i7. 



lUciniKNK, A. et L., Arrh. Zool. A'.'7V., t.iuie liii (1913), p. 61 (Le Portel, near K'-u^yne). 

 M'lNTOSH, Ann. May. X<it. ///.<, ser. 8, vol. i (1908), pp. 3sn, :!8l (Cuernsey, Menu). 

 Marine Biol. Assoc., Journ. Mar. ISinl. Awe., N.S., vol. vii (1904), ]>. i':'.l (I'lymouth). 

 MARION et BOBRETZKY, Ann. Sei. A"'</., s^r. 6, tome ii (187"i), p sd ((iulf of Marseilles). 

 MARION, Ann. Sri. Nat. Zool., ser. G, tome viii (1879), Art. X<>. 7, p ~> (off Marseilles). 

 PRUVOT, Arch. Zool. A>;><r., S/T. 3, tome iii (1895), p. 043 i lianynls) ; /' cit., tome v (1897), p. 16, 



"Catal. ties Invertebn's, etc. " ( I'.rittaiiy ; Gulf nf Lyons). 

 SAINT-. IOSKPU, Ann. Sr.i. A'nf. ZuoL, s. : i'. 7. tnme xvii (1S94), ]>. 103 (l)iuaril ami Saint-Malo) ; uji. cit., 



ser. 8, tome v (1898), p. 213 (Saint- Vaast) : op. cit., bum: x (1899). p. 1G4 (Paimpol); op. cit., 



s-r. 9, tome iii (1906), pp. 147, '2:!0 (Cannes). 



A Nc/c/v(7/f//(/.s- hearing in the tir.-t notopodium (l) stout lint stfai^lit. tapering 

 chreta? ; (2) very stronu eh;i-t;r eiirveil at their tips; (.".) slemler eapillarv eha'tie. 

 Stout eh.-i'tje are not present in anv of the Mieeeeilin^- notopoilia or in the neuropodia, 

 the armature of which consists only of slemler. capillary clm't;e and furcate chsetse. 

 Neiiro|poilial eiri'i appear alioui i he -_'7tli segmenl (rarelv anterior to this, and in 

 some specimens not until the 31st segment), and arc pre-ent in all the succeeding 

 chsetife rous > ( -^ments (except iii one or two of the last formed). 



HISTORICAL Accorxr.- >'. minutus was described h\- (iuniK trom specimens 

 collected liv him on the shores of the island of Liissin. in the . \driatii-. He, howexer. 

 mistook the dorsal for the ventral surface. The generic- name is liased on another 

 misconception, for the two dark plates dc~oril>ed l>v <!r. n:i-: ("-ulitus ad os laminis 2 

 ni'jri- eorneis tricuspidibus armatus") as liornv and mi tlie ventral side of the head- 

 lolie are the eyes which arc situated on the dorsal side of the prostomium. The rest 

 of the description and the li'jiiie- are admirably clear, and the species was so well 

 defined livtiurr.K that -uli-diiieni workers have had no difficulty in recop-nisino it 

 when it came into their hands. (Ji:i r.i. also, with his usual insight. iecOL r nised the 

 close afKnity of his new ^eiius with S,-<ili1>n'<jin<t. 



(ROY. soc. tuix. TRANS., VOL. L, 41'.).) 



