vol, 2, pt. 2.] A TAXONOMIC STUDY OF THE SALPIDAE METCALF. 



73 



ventral division runs backward and a little ventralward, to the 

 posterior edge of the third body muscle (fig. 49). In the lower lip 

 there is a verv short uncon- , _ . 



J i^I+ 1.771. 



nected band (I. 1) at the edge 

 of the lip (fig. 51), not before 

 described, and a second, broad, 

 sphincter (Z. 2) not split as in 

 the embryo Streifl 7 figures (fig. 

 50), and continuous with* the 

 dorsal retractor. There is a 

 third sphincter, not so broad 

 as the last, continuous dorsally 

 with the first sphincter of the 

 upper lip. Thedorsalretractor 

 shows broad fibers on its edges, 

 as does the main trunk of the 

 ventral retractor. The two 

 elongated posterior divisions of 

 the retractor, on the other 

 hand, do not show their mar- 

 ginal fibers broader than their central ones. The fourth sphincter 

 of the lower lip is broad. Posteriorly it is continuous with the ven- 



Fig.50.— Apsteikia punctata, embryo, oral muscula- 

 ture, VIEWED FROM THE RIGHT SIDE. FROM STREIFF 

 (1908), MY LETTERING. 



Fig. 51.— Apsteinia punctata, solitary form, adult. The oral end of the body, antero-laevo. 

 dorsal view. x 5 diameters. (drawn by hoyt s. hopkins.) 



tral oral retractor. Just in front of the intermediate muscle lies a 

 very broad fifth sphincter of the lower lip, with broad marginal fibers. 



