171 



measure ca. 230 fi in length and 170 /< in width. The bridge is 

 distinctly dented and the anterior margin of the articular hole is 

 serrate. In the posterior end of the plate there are 4 — 6 small 

 holes. The smaller plates (Fig. 19. 4) measure ca. 150 fx in length 

 and 130 jti in width. The articular hole is in these plates usually 

 smooth and the teeth on the bridge are not so distinct as on that 

 of the large plates. In the posterior end of the plates there are 

 some few more small holes. The miliary granules are found only 

 in the white stripes of the ambulacra and in the white rings on 

 the tentacles. They are either irregularly formed rosettes or free 

 minute granules (Fig. 16. 5), arranged in more or less regular circles. 



This species is easily recognized by its peculiar colour and by the 

 shape and colour of the calcareous ring. The only other species with 

 five white stripes, known is ater, but the dark violet or purple colour 

 of the latter, as well as the shape of the anchor-plates and the miliary 

 granules, distinctly separate the two species. 



Synaptula alba n. sp. 



Off Neira, Banda. 19. VI. 1922. 13 m. Sand. One specimen. 



The specimen at hand measures, without the tentacles, 8 cm in 

 length; the tentacles measure ca. 1 cm. The colour is a pure white, 

 and the tentacles are of the same colour as the body. There are 

 13 tentacles, each with 16 pairs of digits. The digits are long and 

 slender, placed with small intervals as in hydriformis (Fig. 23. 1) 

 and not united by a web. Eye-spots are present on the oral disk. 

 The cartilaginous ring is large and with small perforations at the 

 posterior margin. The calcareous ring (Fig. 18. 1) is pure white. 

 The radial pieces are perforated for the nerves and the interradiais 

 have a large projection on the anterior margin. There are eight 

 polian vesicles and a single stone-canal. The gonads are very thin 

 and branched several times. The intestine has a large loop and on 

 the mesenteries there are ciliated funnels of the usual size and shape. 



The anchors and anchor-plates from the two ends of the body 

 are rather alike, but in the anterior end there are two, and in the 

 posterior end three different sizes. The largest anchors (Fig. 19. 8) 

 measure ca. 300 // in length and 160 fi in width, those of the second 

 size (Fig. 19. 6) ca. 210 fi in length and 110 // in width. These 



