vol, i\ ft. 2.] A TAXONOMIC STUDY OF THE SALPIDAE METCALF. Ill 



THALIA DEMOCRATICA, solitary form. 



There are five body muscles (fig. 104), usually in two groups, 

 I + 11 + III, aud IV +V. In some individuals muscles IV and V do 

 not touch on the dorsal mid line. All are continuous across the 



///. 



B 



Fig. 104.— Thalia democeatica, solitary form: A, dorsal view; B, seen from the left side. X ^h 

 diameters. from specimens collected off newport, rhode island. (drawn by hoyt s. 

 Hopkins.) 



dorsal and ventral mid lines. The intermediate muscle is continuous 

 ventrally, but interrupted dorsally. 



The oral musculature is well shown by Streiff (1908), whose figure I 

 copy (fig. 105). The well-developed retractor connects in front with 

 three sphincters of the strongly incurved lower lip and one incom- 

 plete admarginal sphincter in the less incurved upper lip. A second 



2621— Bull. 100, vol. 2—19 8 



