215 



fined to the ambulacras. They are small, rounded, more or less 

 bent rods (Fig. 30. 11). The rods in the digits (Fig. 30. 10) as 

 well as those in the tentacle-stem (Fig. 30. 9) are irregularly shaped 

 and characteristic in being perforated. 



Lept. micropatina appears to be most closely related to tenuis, 

 from which species it differs on the other hand distinctly in the shape 

 of the calcareous deposits. Besides, also the size of the anchors 

 and plates afford a valid character for separating the two species, 

 but because of the large difference in the size of the specimens 

 in hand of the two species, this character is not for the present 

 to be relied upon. 



Leptosynapta clarki n. sp. 



Roxton Passage. 9. VI. 1915. 15 — 25 fms. Mud and stones. 2 specimens. 

 Nanaimo. 26.VI.1915. In the lagoon. 96 specimens. 



The specimens from Nanaimo measure up to 25 cm in length 

 by 0,5 cm in diameter. Their colour is bright yellow, the numerous 

 small papillae on the body being of the same colour as the skin. 

 They have twelve tentacles, each with four pairs of digits. The 

 terminal digits are by far the longer. On the oral side of the ten- 

 tacles there are usuallly 3 — 4 sensory cups, but there may be up 

 to seven. Eye-spots are wanting. The radial pieces of the calcareous 

 ring (Fig. 31. 15) are perforated for the nerves and the muscular 

 impressions are visible. A cartilaginous ring is wanting. There are 

 few, 1 — 3 polian vesicles, and a single stone-canal. The alimentary 

 canal is straight and consists of a long and thin oesophagus, a thick 

 and glandular, stomach-like intestine and a short rectum. The 

 ciliated funnels (Fig. 31. 18) are found in the usual three inter- 

 ambulacra. There are, as in tenuis, two different sorts, the small 

 ones being funnel-shaped and the larger ones labiate. The gonads 

 are well developed and contain eggs with a diameter of ca. 240 ^. 

 They are much branched and open on a very small papilla between 

 the dorsal tentacles. 



The anchors in the posterior end of body are rather varying 

 in size and shape (Fig. 31. 1-3). They measure ca. 190 — 210 ^ 

 in length and 70 — -80 fi in width. The arms are rather short and 

 distinctly serrate. The anchors from the anterior end of body are 

 more varying than those from the posterior end (Fig. 31. 4-6). 



