626 F. H.. GRAVELY. 
1893. Braem, F.—‘ Zur Entwicklungsgeschichte von Ophryotrocha 
puerilis,” ‘ Zeitschr. wiss. Zool.,’ lvii, 1895 (Leipzig, 1894), pp. 
187-223, pls. x, x1. 
—— Korschelt, E.—‘ Ueber Ophryotrocha puerilis und die 
Polytrochen Larven eines andern Anneliden,” * Zeitschr. wiss. 
Zool.,’ lvii, 1893 (Leipzig, 1894), pp. 224-289, pls. xii-xv. 
Malaquin, A.— Récherches sur les Syllidiens,’ Lille, 1895. 
1894. Hacker, V.—‘‘ Die Spitere Entwicklung der Polynoé Larve,” 
‘Zool. Jahrb. Abth. f. Anat. u. Ont.,’ viii, 1894, pp. 245-288, 
pls. xiv-xvil. 
—- Béraneck, E.—* Quelques stades Larvaires d’un Chétoptére,” 
‘Rev. Suisse Zool.,’ ii, 1894. 
—— McIntosh, W. C.—* A Contribution to our Knowledge of the 
Annelida,” ‘Quart. Journ. Micro. Sci.’ (n.s.), xxxvi, 1894, pp. 
33-76, pls. vi-viil. 
1896. Hacker, V.—‘ Pelagische Polychetenlarven,” ‘ Zeitschr. wiss. 
Zool.,’ xii, 1896-7 (Leipzig, 1897), pp. 74-188, pls. ili-v. 
1903. Leschke, M.—* Beitrage zur Kenntniss der pelagischen Poly- 
chetenlarven der Kieler Féhrde,” ‘Wiss. Meersuntersuch’ (Neue 
Folge), vii, Kiel, 1903, pp. 115-136, pls. vi, vii. 
1908. McIntosh, W. C.— Monograph of the British Annelids,’ vol. ii, 
pt. 1. 
1909. Gravely, F. H.—* Polychet Larve from the July Plankton of 
Port Erin Bay,” ‘ Proc. Liverpool Biol. Soc.’ ; issued separately 
as L.M.B.C. Memoir, No. xix. (In the press.) 
REFERENCE LETTERS. 
C. Gr. Ciliated groove (pretentacular in Spionid A, post-tentacular 
in Polydora B). C.LZ. Ciliated area of external surface of lips. 
C.st. Stout (sensory ?) cilia of lips. H. Eyespots. Gtr. Gastrotroch. 
M. Mouth. Msl. Muscle-band in lips of Spionid D. Nétr. Neuro- 
troch. Pr. Anterior end of prostomium (modified to form a sheath for 
the “snout” in Spionid D). Ptr. Prototroch. R. Ptr. Ridge bearing 
prototroch. 8S. per. Permanent (neuropodial) sete. S. prov. Pro- 
visional sete (only the bases shown). Sn. “ Snout” of Spionid D. 
T. Tentacle. 7T.C. Tuft of cilia. T'b. Contorted ? tubes in Spionid D. 
Vtb. Vestibule. 
