30 AEÏ. 4. 1. IKEDA : 



Between every two rows of the liooks, there are further found 

 numerous perforated papillae or " Miindungspapillen " (Fig. 61), 

 a small paipllary structure which is so slightly elevated as to 

 measure only 0.02 mm. in height. On the apex and around 

 the small aperture of the suhdermal gland, there occur in the 

 papilla-wall a few chitinous granules disposed in a small ring. 



The longitudinal musculature of the body-wall is divided 

 into 20-30, separate but anastomosing bundles. The retractor 

 muscles are represented by the ventral pair only, the dorsal pair 

 being wanting. The ventral retractors {vm, Fig. 62) spring 

 from the middle of the body proper. The dorsal vessel, runniug 

 along the dorsal side of the oesophagus, is not provided with 

 contractile villi. The intestinal convolution {ic) consists of 10 

 double spirals around the S23indle-muscle, which is fixed at both 

 ends to the body-wall. There is only a single fixing muscle 

 (/>«), which, arising on the left of the nerve- cord, attaches it- 

 self to the first spiral. The rectum is tolerably long; it is with- 

 out a rectal diverticulum. The segmental organs {so) are about 

 half as long as the body proper; their external apertures are 

 situated at nearly the same level as the anus. The organs, for 

 the greater part of their length, are connected with the body- 

 wall by a mesentery. The tentacles are about 22 in number ; 

 they are relatively short and finger-shaped. 



According to Selenka's Monograph, there should be known 

 only one species belonging to the genus Phymoioina, viz., Ph. 

 Rüppelü Grube, that is characterised by having hooks and only 

 two retractor muscles. In these respects the present species 

 agrees with Ph. Püppelli, but in the form and structure of the 

 papillae, in the number of tentacles, etc., it differs from it sufii- 

 ciently to justify specific distinction. 



