180 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



e.l, e.2, e.S, etc.=parts of dorsal eye labeled with no indication of homologies. 

 e / .=basal portion of dorsal eye. 

 e".= apical portion of dorsal eye. 



e /// .=optic plug of Cyclosalpa pinnata or its homolog in other species* 

 ec/i.=spinose area of the test in Salpa maxima, variety tuberculata. 



eZ.=eleoblast. 

 em.=embryo. 

 en.=endostyle. 

 ep.= ectodermal epithelium. 



e5'=accessory eye or accessory portion of eye in solitary form. 

 ex=accessory eye in ganglion, dorsal. 



e?/=accessory eye in ganglion, posterior, anterior, or lateral. 

 £.=gill. 

 00=ganglion. 

 gl. =gl&nd. 

 A.=heart. 

 h. m.=dorsal horizontal muscle. 

 I, II, III, etc. = body muscles. 



i. c. intermediate cells. 

 i. m.=intermediate muscle. 

 int.= intestine. 



£=ectodermal epithelium. 

 F=pharyngeal epithelium. 



L=oral sphincter muscle of lower lip. These are often numbered l.l, 

 1.2, 1.3, etc. 

 I. o.=luminous organ. 

 Zw.=lumen of nerve tube. 

 m.=mouth. 

 n.=nerve. 

 n. c.=nerve cell in ganglion in zone of origin of the nerves. 

 n. a;.=nerve to dorsal accessory eye in ganglion. 



o.= ovary. 

 o. c.=optic chamber, a lymph space. 

 odf.=oviduct. 



oe.=esophagus or its aperture, 

 o. r.=oral retractor. 



o. s.=optic sheath, of ectodermal epithelium. 

 p.=pigment. 



p / .=pigment of basal portion of eye. 

 p // .=pigment of apical portion of eye. 

 p /// .=pigment of optic plug in Cyclosalpa pinnata, or its homolog in other 



species. 

 p. «.=post-abdomen. 

 pe?.=peduncle. 

 ph.= pharynx. 

 ph. 6. = peripharyngeal band of cilia. 

 ph. ep.= pharyngeal epithelium. 

 pZ.=placenta. 

 p. £.=pigment of dorsal accessory eye in ganglion, 

 (^problematic organ (or cells) near intestine. 



r=primitively mid-posterior point of the eye. Used only in 

 figure 12. 

 s£.=stolon. (In figs. 31-33, pp. 59 and 60, it indicates what Ihle calls 

 the " stololoblast " or "eleoblast ".1 



