DESCRIPTION OF SPECIES 145 



The stalk is of nearly uniform diameter down to its lower end, where it bears a dense tuft of hair-like 

 processes. A few sand particles adhere to the body and to the basal test-hairs of the stalk. The test 

 of the body is very thin and almost completely transparent. 



Body wall. The body wall is very thin, with slender muscles, which are mainly circular strands 

 concentrated round the siphons. A few longitudinal strands radiate from the siphons across the sides 

 of the body. 



Text-fig. 66. Eugyra arnbdckae sp.n. (St. 366): A, intact specimen from the right; B, body from the left; C, oral tentacle; 



D, dorsal tubercle; E, a stigma; F, stomach; G, gonad. 



Tentacles. There are eight large oral tentacles (Text-fig. 66 C) and eight smaller ones alternating 

 with them, and sometimes a few still smaller ones can be seen. The tentacles have a stout tapering 

 stem, a few primary branches and some short secondary branches. 



Dorsal tubercle. The dorsal tubercle is small with a straight or slightly curved slit placed in a 

 longitudinal or oblique direction (Text-fig. 66 D). The dorsal tubercle covers the anterior part of the 

 small ganglion. 



Branchial sac. There are no folds in the branchial sac, which has on each side seven tall longi- 

 tudinal bars. Under each longitudinal bar is a row of flat stigmata (Text-fig. 66 E). The stigmata are 



19 D M 



