218 



The anchors from the posterior end of body (Fig. 32. 1) are ca. 

 150 ii long and 70 jn wide. They are very slender and the arms 

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

 (Fig. 32. 2) are shorter and their arms are thicker, with but 1 — 3 

 small teeth. They measure ca. 110^ in length and 70 /a in width. 

 The anchor-plates from the posterior end of body (Fig. 32. 3) measure 

 ca. 120 n> in length and 100 ^ in width. They have seven large, 

 toothed holes in the anterior end, and besides the paired side-holes, 

 three small holes in the articular end. The plates from the anterior 

 end of body measure ca. 190 /a in length and ca. 80 ^ in width. 

 They are rather varying in shape (Fig. 32. 4-5) and have usually 

 in the articular end a single smooth hole more than the posterior 

 plates. Rods are entirely wanting, both in the anterior and in the 

 posterior end of body, but in the interambulacra there are found 

 some very small rounded calcareous bodies (Fig. 32. 8). 



Leptosynapta lens is the most closely related to albicans Selenka, 

 and may ultimately prove to be identical with it. But for the pre- 

 sent I think it is preferable to keep the form here described as 

 a separate species. 



Leptosynapta transgressor n. sp. 



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

 Nanoose Bay. 15. VI. 1915. Ca. 25 fms. Mud and stones. 5 specimens. 



The specimens at hand are very small being not more than 

 1 cm in length. The number of tentacles is varying; one of 

 the specimens from Nanoose Bay has but 9, three have 10 and 

 one has 1 1 . The number evidently does not depend on size, 

 as the specimen with eleven tentacles is but 0,6 cm long. The 

 specimens from Roxton Passage are lacking the tentacles. Each 

 tentacle has 4 — 5 pairs of digits and 2 — 3 sensory cups. The cal- 

 careous ring (Fig. 32. 10) is well developed and muscular impress- 

 ions are visible. The radiais are perforated for the nerves. There 

 are 2 — 3 polian vesicles and a single unbranched stone-canal. In 

 the polian vesicles there are numerous large rods (Fig. 32. 14) 

 usually with an undulating outline. The gonads are, in the specimens 

 at hand, unbranched, but as they are not fully developed, they may 

 be branched in mature specimens. The opening of the genital duct 

 is (probably due to the young age of the specimens at hand) not 



