224 
W. 7\. HA SWELL. 
8. Pierantoiii, U. — “ Protodrihis,” ‘Fauna u. Flora des Golfes v. Neapel,’ 
xxxi, 1908. 
9. Shearer, Cresswell. — “ On the Anatomy of HistrioLdella homari,” 
‘ Quart. Journ. Micr. Sci.,’ N.S., vol. 55, 1910. 
EXPLANATION OP PLATES 11 to 14/ 
Illustrating l^rofessor W. A. HaswelPs “Notes on the 
HistriobdeilidaB.” 
List of Reference Letters. 
b. Brain. hd. Bridle. c. Ccelenchyme. c. c. Caudal coelenchynie. 
ce.c. Cervical coelom, ci. Cirri, cu. Ciliated cushions. /. Fulcrum. 
gl. c. Cervical gland, gl. d. Dorsal gland, h. c. Head-coelom. ^. Intes- 
tine. j. Jaws. l.gl}. Gland of anterior limb. 1. gld. Gland of posterior 
limb. l.j. Lower jaw. m. d. Dorsal longitudinal muscles. m. v. 
Ventral longitudinal muscles, nd, nr, nd. First, second and third pairs 
of nephridia. n.c. Nerve -cord. o. Ovary. ce. (Esophagus. ovd 
Largest ovum. ovr. Second largest ovum. rd,rd, rd,rd. Ramules of 
upper jaw. r. gl. Rectal gland. s.L Septum between neck-segment and 
trunk, s.-. Septum behind large ovum. Septum between trunk and 
tail. s.\ Partial segment in front of largest ovum. s.''’. Septum between 
neck-segment and head. sh. Shell-gland secretion, sh.gld. Shell-gland. 
st. Stomach, s.m. Striated muscle (of jaws), sj?. Spermatozoa, sph. 
Sphincter between oesophagus and stomach. Sperniatophore. 
'u.j. Upper jaw. v. m. Vertical or dorso-ventral muscular fibres, v. n. 
“ Visceral ” nervous system, vit. Vitelline glands. $. Female genital 
aperture. 
PLATE 11. 
Figs. 1-5.— Five successive longitudinal verticjil sections of a mature 
female Stratiodrilus nova3-hollandia3. X 200. In the sections 
represented in tigs. 1 and 4 the lower jaw (l.j.) has become detached from 
its natural position. 
PLATE 12. 
Fig. 6. — A sixth section of the same series as those represented in 
Plate 11. X 200. 
^ All the figures were re-drawn for me by Mr. F. W. Atkins. 
