217 



They measure 140 — -190 fi in length by ca. 90 fv in width. Their 

 arms are short and thick and usually quite smooth. The anchor- 

 plates (Fig. 31. 7-13) are of varying size and shape, but not distinctly 

 different in the two ends of body. They measure 100 — 130 /a in 

 length by 70 — 100 ft in width. They have usually seven large 

 toothed holes in the anterior end, and rather few smooth holes in 

 the articular end. 



The rods in the ambulacra (Fig. 31. 17) are of varying shape, 

 bent rods, chela-shaped bodies or rings. In the posterior end of 

 the interambulacra there are some few large semicircular spicules 

 with forked ends (Fig. 31. 16). The rods in the digits and in the 

 tentacle-stem (Fig. 31. 14) are alike. They are large, nearly straight 

 rods with enlarged, weakly branched and usually perforated ends. 



This species, the West American representative of inhaerens, 

 is easily distinguished from both tenuis and inhaerens, from which 

 two species it differs in nearly all characters. I dedicate this well 

 marked species to the eminent author of the "Apodous Holothurians". 



Leptosynapta lens n. sp. 



Bird Rock, La Jolla. 27. VIII. 1915. Rocky shore. 1 specimen. 



False Bay, Lajolla. 12. IX. 1915. Shallow water. Mud— sand. 25 specimens. 



The largest specimen at hand measures ca. 3 cm in length. The 

 skin is yellow, but the numerous brownish warts make the colour 

 of the specimens in alcohol brownish-grey. There are twelve ten- 

 tacles each of which has five pairs of digits and 6 — 9 sensory- 

 cups. Eye-spots are wanting. The calcareous ring (Fig. 32. 7) is 

 very characteristic as all the pieces have a large nearly square notch 

 in their posterior margin. The radiais are perforated for the nerves, 

 and muscular impressions are visible. A cartilaginous ring is want- 

 ing. There is one polian vesicle and a single unbranched stone-canal. 

 The alimentary canal is straight and the oesophagus is long and 

 thin, and distinctly different from the stomach which, as in clarki, 

 seemingly reaches to the short rectum. The gonads are branched 

 and the genital duct opens on a long papilla. This papilla is ca. 

 one third of the tentacle-length and is placed in the dorsal inter- 

 ambulacrum, its own length posterior of the tentacles. The ciliated 

 funnels are, as in clarki, of two different sizes and shapes, the larger 

 ones being labiate (Fig. 32. 6). 



