ZooL.— Vol. II.] 



J? OBER TSON—ENTOPK OCT A. 



347 



ABBREVIATIONS USED IN THE FIGURES. 



ap. sep. — aperture of septum. 



at. re. — atrial retractor. 



at.fl. — atrial floor. 



atr. — atrium. 



bas. r. — basal rib. 



br. — branch. 



br. so. V. in. — branch of somatic 



ventral muscle. 

 els. I. — " liver cells." 

 cl. els. — closing cells of septum. 

 els. at.fl. — cells of atrial floor. 

 els. g. d. — cells of genital duct. 

 cu. — cuticle. 

 chi. I. — chitinous layer. 

 dor. s. — dorsal side. 

 dor. m. — dorsal muscle. 

 dor. sep. — dorsal septum. 

 dor. w. — dorsal body-wall. 

 ec. stk. — ectoderm of stalk. 

 ec. ca. — ectoderm of calyx. 

 ec. — ectoderm. 

 gn. — ganglion. 

 int. — intestine. 



in. seg. — intercalated segment. 

 loph.f. — lophophoral fold. 

 tn. dil. — muscular dilatation. 

 m. g. d. — muscles of genital duct. 

 m. stk. — muscle of stalk. 



nan. pi. seg. — non-polypide-bearing 



segment. 

 nu. — nuclei. 

 oes. — oesophagus. 

 0. m.f. — oblique muscle fibers. 

 0. stk. — old stalk. 

 pa. stk. — parent stalk. 

 p. — pore. 

 pha. — phalanx. 

 re. els. — regenerating cells. 

 rec. — rectum. 

 sag. r. — sagittal rib. 

 spl. reg. — spineless region. 

 sto. — stolon. 



so. V. in. — somatic ventral muscle. 

 sep. — septum. 



sph. loph. — sphincter of lophophore. 

 St. — stomach. 

 .y/4:.— stalk. 



sto. pro. — stolonic process. 

 sue. pi. seg. — successive polypide 



bearing segments. 

 sum. — summit of calyx. 

 tent. m. — tentacular muscles. 

 ten. r. — tentacular rib. 

 V. s. — ventral side. 

 V. m. — ventral muscle. 

 V. m. stk. — ventral muscle of stalk. 

 V. w. — ventral body wall. 



