REPORT ON THE MYZOSTOMIDA. 11 



pharynx (p/i) measuring 0'3 mm. in length. The somewhat weakly developed parapodia 

 (p) are rather nearer the mai'gin than the centre of the body; the oval suckers (s) lie 

 halfway between the margin and the parapodia They measure 0"06 mm. in their longer 

 diameter. 



One specimen found Ijring loose in spirit with Actinometra solans, Actinometra bennetti, 

 and five species of Antedon from the Moluccas (K. zool. Genootschap, Amsterdam). 



75. Myzostoma furcatum, n. sj). (PI. II. figs. 5—7). 



Eecalling Myzostoma lobatum, Graff" (Das Genus Myzostoma, Taf. ii.) in its 

 four caudal appendages, into which the hind end of the body divides, as also in the 

 unequal notching of the margin. The single specimen before me shelves off from 

 the middle line towards the sides, and is bent upwards both anteriorly and posteriorly, 

 so that no exact figure of the contour can be given. The lateral portions of the body 

 are protruded anteriorly, so that in its extended state the middle of the anterior 

 margin must appear to be turned in. The maximum length in the lateral portions, 

 including the caudal appendages is nearly 8 mm. The inner pair of caudal appendages 

 (cfXj) is a little longer than the outer pair (c«i), and measures 1*5 mm. The latter 

 have a conical form and an almost perfectly smooth surface without thinned lateral 

 fringes. Nor are the marginal notches of the disc markedly thinner than the latter, 

 and look more like warts compressed from above downwards. 



Along the middle line of the back there extends a narrow, but sharply defined ridge 

 (fig. 5, aa), and there are similar radial ridges, which extend on either side from beside 

 the median pad on to the marginal notches. Each of the caudal appendages bears a 

 similar ridge. 



The colour is a dark warm sepia-brown, both above and below. The very strongly 

 developed parapodia (fig. 6, p) lie in two almost parallel rows nearer the (depressed) middle 

 line of the ventral surface than the margin, and almost halfway between them and the 

 margin are the round and markedly projecting suckers (s). The pharynx (j^jJi) is in 

 this form stretched far forwards. On one side the blunt male genital papilla ($) can 

 be recognised. 



Found lying loose in spirit with a black Actinometra (n. sp.), and several other 

 Comatulse from the Moluccas (K. zool. Genootschap, Amsterdam). 



76. Myzostoma memhranaceum, n. sp. (PL I. figs. 1-3). 



Of this species I have two specimens before me, of which the larger is figured. 

 It measures 7*5 mm. in length, and when the ventrally incurved sides were unfolded 



