THE CALCIFEROUS GLANDS OF EARTHWORMS. 
485 
EXPLANATION OF FIGURES. 
a., axis of lamella; b.m., basement membrane; oil., cilia; crys. , crystals, probably of calcium carbonate, 
within the gland; d.v., dorsal vessel; epi. obs., epithelium of oesophagus; h., heart; int., dilated internal 
end of lamellar sinus; l., lamellae of gland; lam. sin., lamellar sinus; l.p., lamellae of oesophageal pouch, 
here not united to form tunnels; lum., central lumen of oesophagus; to., muscular coat; n., nucleus in 
lamellar sinus; oes., oesophagus; oes. p., oesophageal pouch; part., vertical partition (in Eutyphoeus) ; perit., 
peritoneum ; per. sin., peripheral sinus ; r., rodlets ; ret., reticular tissue and loose spaces beneath oesophageal 
epithelium; sem. ves., seminal vesicle; sept., septum ; s.i.v., supraintestinal vessel; t., tunnel; v., vessel in 
dorsal edge of vertical partition ; vent, v., ventral vessel ; x, incomplete roof of tunnel ; y, flat cell roofing 
tunnel ; z, dilated end of lamellar sinus closed in by basement membrane and a thin protoplasmic layer. 
Fig. 1. Pheretima hawayana ; horizontal longitudinal section through the oesophagus in segment xii. 
x 50. 
Fig. 2. The same ; cells of a fold of the oesophageal epithelium ; formalin, Delafield’s haematoxylin and 
eosin. - x 570. 
Fig. 3. Ocnerodrilus occidentals ; transverse section through a calciferous gland, in front of its junction 
with the oesophagus, x 160. 
Fig. 4. The same ; epithelium of oesophagus in segment x, behind the entry of the calciferous glands ; 
rodlets well marked ; Zenker, Delafield’s haematoxylin and eosin. x 290. No muscular coat is visible. 
Fig. 5. Octochsetu-s barkudensis ; transverse section of oesophagus with calciferous gland of one side ; 
rodlets on oesophageal epithelium not visible at this magnification. x 130. 
Fig. 6. The same ; part of calciferous gland, outer wall with lamellae arising from it. Fixative not 
known ; 'Delafield’s haematoxylin and eosin. x 300. 
Fig. 7. Eutyphoeus gigas ; dissection of oesophagus in segment xii, which is opened to show the calci- 
ferous glands within. 
Fig. 8. Eutyphoeus waltoni ; calciferous gland of one side in horizontal longitudinal section. x 40. 
Fig. 9. The same ; lamellae of calciferous gland in vertical longitudinal section ; formalin, Delafield’s 
haematoxylin and eosin. x 145. 
Fig. 1 0. The same ; transverse section of part of calciferous gland, the vertical partition being cut 
transversely ; one or two of the lamellae are also cut, perhaps owing to the section being slightly oblique ; 
formalin, Delafield and eosin. x 160. 
Fig. 11. Helodrilus parvus ; transverse section through alimentary tube in segment x of a young sexual 
specimen. The section is slightly oblique, and therefore shows a slightly different level on the two sides ; 
on the right the section passes through the oesophageal pouch anterior to, the appearance of prominent 
lamellae ; on the left lamellae are present, which below are fusing together to form tunnels. Fixative not 
known ; van Gieson’s stain. x 180. 
Fig. 12. Helodrilus caliginosus ; transverse section through oesophagus of a young specimen in segment 
xi ; tunnels established, rodlets as a fine border. Formalin, Delafield and eosin. x 125. 
Fig. 13. The same; a portion of the oesophageal wall more highly magnified. Same preparation, x 550. 
