164 COELBNTERATA. 



Fam. 1. Tesseridae. Umbrella edge without lobes ; 8 principal tentacles 

 (4 perradial and 4 interradial) ; marginal anchors absent. Apex of the ex- 

 umbrella surface prolonged into a hollow process or stalk for attachment. 

 Tessera H. (Fig. 133) and Tesserantha H., with hollow, ex-umbrella process not 

 used for attachment ; Depastrella H., Depastrum H., with ex-umbrella stalk for 

 attachment. 



FIG. l34.Haliclystus auricula (from Chun, after Clark). I. From the side. II. From the oral 

 face. III. From the side with evaginated umbrella and protruded mouth. IV. Marginal 

 anchor from the axial side, p stalk ; su sub-umbrella ; t one of the eight tufts of knobbed 

 tentacles on the eight hollow triangular marginal lobes ; ra one of the eight marginal 

 anchors ; t 1 anchor tentacle ; U collar of adhesive glandular ectoderm ; oc eye-spot ; en vessel 

 of marginal anchor ; o mouth ; se interradial septal ridge passing into the taenioles (ft) of 

 the stalk ; gen one of the eight adradial gonads on the sub-umbrella wall of the four radial 

 gastric pouches, representing four interradial horse-shoe gonads connected at the oral end of 

 the septal ridge. 



Fam. 2. Lucernaridae. With 8 adradial umbrella lobes, and tufts of short 

 knobbed tentacles at end of each lobe. With 8 principal tentacles (4 per- 

 and 4 interradial) as marginal anchors (Fig. 134), or absent. An ex-umbrella 

 stalk for attachment. Halidystus Clark, Halicyathus Clark, with marginal 

 anchors ; Lucernaria 0. F. Miiller, Craterolophus Clark, without marginal 

 anchors. 



