213 



Leptosynapta micvopatina n. sp. 



Tobago, B. W. I. IV. 1916. The lagoon. Sand-bottom. 2 specimens. 



The specimens at hand measure ca. 5 cm in length by 0,2 cm 

 in diameter. Their colour is in alcohol pale yellow. They have 12 

 tentacles, each with five pairs of digits and 4 — 7 sensory cups. 

 Eye-spots are wanting. The calcareous ring is well developed (Fig. 

 30. 12). Each piece has an anterior projection and the radiais are 

 perforated for the nerves. Muscular impressions are, especially on 

 the radiais, distinct. A cartilaginous ring is wanting. Owing to the 

 preservation of the specimens it is not possible to see much of the 

 internal anatomy. The gonads include well developed eggs, and the 

 genital porus is found on a long and thin papilla. This genital 

 papilla is found close to the tentacles; it is ca. one third of the 

 tentacle length and thinner than the digits. 



The anchors are in the posterior end of the specimens ca. 120 

 [jb long and 60 fi wide. They are rather slender (Fig. 30. 5 a) and 

 on their arms there are 4 — 5 teeth. Besides these large anchors, 

 there are some few smaller ones, which do not measure more than 

 ca. 79 fi in length. These anchors (Fig. 30. 5) are of the same 

 shape as the larger, but they have not more than 2 — 3 teeth on 

 the arms. The anchors in the anterior end of the specimens (Fig. 

 30. 7-8) measure ca. 80 fi in length. They are not so slender as 

 the anchors in the posterior end, and their arms are usually quite 

 smooth. The anchor-plates corresponding with the large anchors in 

 the posterior end of the specimen (Fig. 30. 1) measure ca. 100 ,u 

 in length and 60 jn in width. They are very varying in shape, and 

 there are distinct bridges across the side-holes. Additional holes 

 may be found in the anterior end of the plates. The articulation 

 with the anchors is somewhat varying (Fig. 30. 2-3) but a distinct 

 bridge across the posterior end of the plates is wanting. The anchor- 

 plates are usually hollow in the middle, and the posteriormost part 

 lies somewhat lower than the rest of the plate. The plates corre- 

 sponding with anchors from the anterior end of the specimens (Fig. 

 30. 4) measure ca. 80 fi in length and 50 fi in width. Additional 

 holes are rare in these plates, but their articular ends are, as in 

 the more posterior plates, very irregularly shaped. 



There are only few miliary granules, which are seemingly con- 



