127 



The anchors (Fig. 7. 1) measure ca. 270 fi in length by ca. 

 170 fi in width. The stock is branched and on the vertex there 

 are minute knobs. The anchor-plates (Fig. 6. 1) are ca. 200 ^ long 

 and ca. 170 ^ wide and on the exterior surface there are some 

 large knobs. The plates in serpentina are very like those in 

 spectabilis, and are as these latter of a relatively constant shape. 

 The miliary granules are rosettes and in the oral disk as well as 

 in the tentacles there are curved rods. The rods from the oral 

 disk (Fig. 7. 8) have the ends a little swollen and branched, which 

 is not the case with those in the tentacles (Fig. 7. 7). The oral 

 rods meassure ca. 80 ,</ in length and the tentacle rods are a little 

 shorter. 



Oph. serpentina is easily recognized by the shape of the pieces 

 of the calcareous ring which, as said, is green, and by having rods 

 in both the oral disk and in tentacles. From Oph. variabilis, which 

 also has a green calcareous ring, it differs distinctly in the shape 

 of the anchor-plates and in the presence of rods. 



Opheodesoma variabilis n. sp. 



North of Oahu. Hawaii. 26.111. 1915. Shallow water. 6 specimens. 



The specimens at hand measure from 20 to 30 cm in length. 

 They are pale yellow with brown or brownish-green spots. They 

 have 15 tentacles each with 20 — 25 pairs of digits, not united by 

 a web. On the oral disk there are eye-spots. The cartilaginous 

 ring is less developed than in serpentina. The calcareous ring (Fig. 

 4. 3) is green. The anterior processes on the calcareous ring are 

 united by a membrane and the radial processes are perforated for 

 the nerves. 



There are many polian vesicles and madreporic canals. The 

 gonads are much branched. The intestine has a loop and on the 

 base of the mesenteries there are small cup-shaped ciliated funnels. 



The anchors (Fig. 7. 2) measure ca. 340 fi in length by ca. 

 230 ^ in width. The stock is branched and on the vertex there 

 are minute knobs. The anchor-plates (Fig. 6. 2) measure ca. 250 ^ 

 in length by ca. 190 /n in width. On the exterior surface there 

 are the common two rows of large knobs around the holes. The 

 shape of the articular end is very variable (Fig. 6. 2-6). Some few 



