99 



c.h. Cephalic Hood of Mantle. 



c.p. Coi-ebro-pedal Connective. 



c.v. Cerebro-Visceral Connective, 



d.D. Puct oi Liie iland ui' Deshayes. 



d.a. Dorsal Ax-tery. 



d.k. Dorsal pivatol Knot of the Shell. 



ep.c. Epibranchial Cavity. 



ep.ca. " Canal. 



e.s. Exhalent or Anal Siphon. 



f. Foot. 



f.c. Frontal Cells of Gill. 



g. Ctenidium or Gill. 



g' . Anterior Gill Filainonts. 



g.a. Ascending Limb of Gill . Filament . 



g.d. Descending Limb of Gill Filament. 



g.du. Genital Duct. 



g.D. Gland of Deshayes. 



gl.ep. Gland Cells of Epidermis. 



g.o. Genital Organ. 



i. Intestine. 



i.f.j. Inter-f ilamentar Junction of Gill. 



i.l.s. Inter-laminar Spaces of Gill. 



i.s. Inhalent or Respiratory Siphon. 



