1 15 



The anchors (Fig. 2. 7) measure ca. 900 fi in length by ca. 

 625 ft in width and the width of the arms is ca. 69 % of the 

 anchor length. The stock of the anchor is not branched but finely 

 toothed, and the arms are smooth. On the vertex there are some 

 minute knobs (Fig. 2. 8-9). These are usually found on the vertex 

 itself, but often in a little group on each side of vertex. The two 

 arrangements do not indicate any specific difference as they are 

 found in the same specimen. The anchor-plates (Fig. 2. 1-3) measure 

 ca. 650 {a in length and in their articular end ca. 400 /ti in width. 

 The articular end of the plates is typically wider than the anterior 

 end, which does not usually measure more than 225 /n. The bridge 

 is present and supplied with irregularly arranged knobs and spines. 

 Across the central hole in the plates there is usually a fine network, 

 and in the two ends of the plates there are numerous small holes. 

 In spite of the relatively large variation of the plates, they are much 

 alike in shape in the eight specimens. Only a single specimen from 

 St. Crux Island (not the specimen with the abnormal madreporic 

 canals) has somewhat different anchor-plates. The plates are in 

 this specimen smaller and more irregularly formed (Fig. 2. 4-5), 

 but as in all other respects it does not differ from the other spec- 

 imens, and even the width-index of the anchors is 69, I suppose 

 it to be only an abnormal specimen of maculata. Rods are want- 

 ing in the oral disk and in the tentacles. The miliary granules in 

 the skin are rosettes (Fig. 2. 6) of somewhat different size and 

 shape. The usual size is 15 — 25 /n in diameter. 



This species is rather distinctly characterized by the shape of 

 the anchor-plates, the width-index of the anchors, the coloration, 

 and in having no membrane between the digits. 



Synapta maculata var. Andreae n. var. 

 Mauritius. 1874. Andréa. 2 specimens. 



The two specimens at hand are in the exterior very different, 

 as the smaller of them has been on exhibition for many years in 

 the museum, wherefore it has nearly quite lost its colour. The 

 other one is the anterior end of a very large specimen, probably 

 the largest Synaptid ever seen. It measures ca. 30 cm in length 

 by ca. 7 cm in diameter. The colour of this fragment is dark olive- 

 green with faint brownish stripes and white spots. Both specimens 



