REPOET ON THE MYZOSTOMIDA. 
55 
second (anterior) pair are about ‘6 mm. long, while all the rest are of equal size, and 
measure ‘2 mm. The character of the cirri in this species recalls those of Myzostoma 
brachiatum (Genus Myzostoma, pi. ii. fig. 2). 
Host. — Uncertain. Brought from Amoy by Dr. Gartner, May 1877 ; Kiel Museum. 
47. Myzostoma cornutum, Graff. 
Myzostoma cornutum, Graft, Genus Myzostoma, p. 15, pL x. figs. 4, 5. 
Host. — Antedon triquetra, Semper, INIS. , Bohol (Philippines) 
48. Myzostoma brachiatum, Graff. 
Myzostoma brachiatum, Graff, Genus Myzostoma, p. 16, pi. ii. fig. 2. 1 
Host.—Actinometra nigra i, Semper, MS., Bohol (Philippines). 
49. Myzostoma Jissum, n. sp. (PI. IV. fig. 1). 
The figure given of this species is enlarged seven times, and only pretends to approxi- 
mate accuracy, since the only specimen at my disposal was so bent and rolled up 
that I was unable to extend it. Nothing can therefore be said about the ventral side. 
I shall merely describe, as well as possible, the dorsal side. In possessing large and cleejtly 
excised caudal appendages this species resembles Myzostoma lobatum, but differs in 
having six of them instead of four. 
In both species there is a longitudinal furrow on the under surfaces of the caudal 
appendages. The colour is a dark brown. On the middle line of the back is a longi- 
tudinal crest, reaching from the obtusely terminating anterior end of the body as far as 
between the bases of the median longest caudal appendages. From the median crest 
five pairs of lateral elevations arise, which pursue an undulating course to the ten large 
prominent and pointed marginal serrations. 
Host. — Uncertain (perhaps Antedon incequalis, P. Id. C.), from Station 174 (south- 
west of the Fiji Islands) of the Challenger Expedition. 
50. Myzostoma intermedium, n. sp. (PL IV. fig. 2). 
This unique specimen also was unfortunately so badly preserved that it was impos- 
sible to examine more than the contour. The body also was very much torn, and on 
account of its thickness but slightly transparent ; only upon the margin, especially between 
the cirri, was it at all transparent. The colour is dark greyish-brown. The body is 
1 Cf. p. 8 of this Report. 
