TUBIFEX. 



395 



EXPLANATION OF PLATES. 



a. = Uncinate setae from 

 bundle. 



ac. nul. = Accessory nucleolus 

 attached to principal one. 



ac. nul 1 . = Accessory nucleolus. 



am. = Ampulla. 



an. I. = Antero-lateral lobe. 



an. r. = Annular ring of vas 

 deferens. 



ar. h. = " Arrow-head " extremity 

 of spermatophore. 



as. — Aster. 



at. = Spermiducal gland. 



ax. c. = Axial cylinder. 



b. = Uncinate setae from dorsal 

 bundle. 



bl. — Blastophore. 



br. = Brain. 



bu. c. = Buccal cavity. 



b. v. sa Blood vessel. 



b. v. i. — Blood vessel in intestinal 

 wall. 



b. w. = Body wall. 



c. = Pectinate seta. 



ca. f. = Caudal filament. 



ca. s. = Capilliform setae. 



c. c. = Chloragogen cells. 



ce. = Cells of vas deferens. 



chr. = Chromosomes. 



cht. = Chromatin. 



ci. = Cilia. 



ci. f. = Ciliated funnel. 



cl. = Clitellum. 



cle. = Cleavage marks. 



c. m. = Circular muscles. 



co. s. = Connective tissue sheath. 



ct. ep. = Ciliated epithelium. 



cu. = Cuticle. 



cu l . = Prolongation of cuticle into 

 setigerous follicle. 



cy. = Cytoplasm. 



List of Reference Letters. 



ventral 



cy. m. = Undivided cytoplasmic 

 mass to which oocytes are attached. 



d. = Capilliform setae. 



d. bl. = Dorsal seta bundle. 



d. t. = Dorsal tubes or neurochord. 



d. v. = Dorsal vessel. 



e. = Subsidiary prongs. 

 W< = Eggs. 



e. m. = Opening of prostate into 

 spermiducal gland. 



epi. = Epispore. 



/. = Fibres of nerve cord. 



fb. s. = Fibrillar substance. 



fl. = Flagellum. 



g. c. = Gland cells of epidermis. 



gr. m. = Granular mass. 



h. = Large blackish-brown granules. 



ht. = Heart. 



hyp. = Epidermis. 



i. = Smaller granules of chloragogen 

 cells. 



in. = Intestine. 



in. c. = Interstitial cell of epidermis. 



in. v. and in. iA. = Intestinal ves- 

 sels. 



le. = Large cells surrounding the 

 lumen of the penis. 



I. m. = Longitudinal muscles. 



m. = Muscles from pharynx to body 

 wall. 



ma. = Matrix. 



m. f. = Intrafollicular muscles. 



mi. = Middle piece. 



m. 1. = Anterior median lobe. 



mo. = Mouth. 



m. p. = Paricto- vaginal muscles. 



mu. = Muscular layer. 



mu. I. = Muscular layer, circular 

 inside, longitudinal outside. 



n. = Nerve cord. 



n. h. ^ Nerves to body wall. 



