229 



of digits and 6 — 8 sensory cups. Eye-spots are wanting. The inter- 

 radial pieces of the calcareous ring (Fig. 37. 4) have a low tri- 

 angular projection on the exterior side. The radial pieces are per- 

 forated for the nerves. A cartilaginous ring is wanting. There are 

 three polian vesicles and a single unbranched stone-canal. The 

 oesophagus is thin and different from the intestine. Ciliated funnels 

 are fan-shaped and placed on the body-wall. The gonads are branched 

 and in the specimens from 3. III. filled with eggs. The genital porus 

 is not visible on the exterior side of the body-wall. 



The anchors from the posterior end of body measure ca. 270 fi 

 in length and 120 /u in width. They are rather slender (Fig. 36. 3) 

 and on the arms there are ca. 6 low teeth. The anchors from the 

 anterior end of body (Fig. 36. 4) measure ca. 200 ^ in length and 

 1 10 ^ in width. Their arms are short and thick and with but 2 — 4 

 teeth. The anchor-plates from the two ends of body (Fig. 36. 10-13) 

 are rather alike. The seven large holes are toothed and in the ar- 

 ticular end there are besides the side-holes, 3—6 small, smooth 

 holes of varying size. The plates are of very nearly the same size 

 and measure ca. 170^ in length and 110 ^ in width. There are 

 two different sorts of rods in the body-wall. The first (fig. 37. 7) 

 is very common in both ends of the body. They are always more 

 or less curved and often C-shaped. The second sort is only found 

 in the anterior end of body, where they are lying very scattered. 

 They are slightly bent (Fig. 37. 5) but never C-shaped and their 

 ends are neither enlarged nor branched or perforated. Their out- 

 line is often faintly undulating. The rods in the digits (Fig. 37. 6) 

 are not different from those in the tentacle-stem. They are rather 

 large and their ends are usually enlarged and perforated. Their out- 

 line is supplied with large knobs, which may be arranged very regul- 

 arly, especially on the convex side. 



This species is in several characters, for instance the shape of 

 the anchors and anchor-plates, and the rods in the digits, very like 

 dolabrifera, from which species it differs in the shape of the cal- 

 careous ring and in having knobbed rods in the tentacle-stem. The 

 presence of long and slender rods in the anterior end of body may 

 also be a useful character for distingushing it from dolabrifera. From 

 the other species of the genus it differs in having knobbed ten- 

 tacle-rods, in the shape of the calcareous ring, and in the shape of 

 the anchors and plates. 



