No. r.] SEiVSE-ORGANS OF LUMBRICUS AGRICOLA. 23 1 



'86 Ude, Herrmann. Uebcr die Ruckenporen dcr terrecolen Oligochae- 

 ten. ZeitscJir. f. luiss. ZooL, Bd. xliii, pp. 87-143. Taf. 4. 



'84 Vejdovskv, Dr. Franz. System und Morphologie der Oligochaeten. 

 Taf. I -1 6. 



*88 VoGT AND Jung. Lehrbuch der praktischen vergleichenden Anato- 

 mie. I. 



REFERENCE LETTERS. 



has. c. basal cells. 



bas. m. basement-membrane. 



bl. V. blood-vessels. 



cir. m-as. circular muscle-layer. 



cov. c. covering cells. 



ad. cuticula. 



cut. sp. cuticular spot, surface view of elevation over sense-organ. 



cut. sh. cuticular sheath of setae. 



ef.f. efferent nerve-fibres going to epidermis. 



epth. epithelial cells lining buccal cavity. 



i^l. c. gland-cell. 



■,'/. /. external opening of the gland-cell. 



inters, gr. intersegmental groove. 



intra, f. intraepidermal nerve-fibres. 



met. metamere. 



mus. fib. motor nerve-fibres of muscles. 



nepli. p. nsphridial pores. 



/. can. pore-canal for sense-hair. 



pros, prostomium. 



sen. c. sense-cell. 



sen. f. sensory nerve-fibres. 



sen. //. .sense-hair. 



sen. org. sense-organ. 



Slip. c. supporting cell. 



sub. net. subepidermal network. 



