REPORT ON THE CRINOIDEA. 143 



It may perhaps be only a younger stage of the larva shown on PL XIV. fig. 3, which 

 I formerly referred to Antedon eschrichti on account of its extremely robust character. 

 I am now satisfied, however, from Levinsen's observations, that the latter supposition is 

 incorrect. The stem and the bases of the arms are nearly as well developed as in his 

 larva of Antedon eschrichti, and the cirri of the first whorl have rather fewer joints ; but 

 the basals are relatively much higher than in the Eschrichti-l&zva, the axillaries 

 of which are of an altogether different shape from those of the larva dredged by the 

 " Porcupine." The latter is not likely to belong to Antedon quadrata, which must have 

 a larva very like that of Antedon eschrichti, if indeed the two species are not identical ; 

 and I conclude therefore that the "Porcupine" larva should be referred to Antedon 

 hystrix, the only other Comatula found in the cold area of the Faeroe Channel. 



The cirri of Antedon eschrichti resemble those of Antedon rosacea and Antedon 

 phalangium in the dimorphic characters of their younger stages. Fig. 6 on PL XXIV. 

 represents an immature cirrus of the normal developmental type. The lower joints are 

 relatively longer than in the full-grown cirrus shown in fig. 4, and its outer part consists 

 of a large number of short and wide joints with a strong terminal claw. On the other 

 hand, fig. 5 represents a " small mature " cirrus which is shorter and composed of fewer 

 joints than the immature one just mentioned ; but the small terminal joints, instead of 

 being short, wide and smooth, are much more like those of the adult cirrus and have 

 slight dorsal projections, though there is only a very small terminal claw. The cirri are 

 very numerous and the centro- dorsal proportionately large,' so that it hides the first 

 radials completely, only very small portions of them appearing on the exterior of the 

 isolated calyx (PL I. fig. 8a). The rosette of Antedon eschrichti is near the dorsal 

 surface of the radial pentagon and very well defined, with ten distinct spout-like 

 processes, of which the interradial ones are a trifle the smallest (PL I. fig. 8c), but there 

 is no indication of a basal star around it, the dorsal interradial furrows being simple and 

 not provided with lateral folds, so that the interradial markings on the upper surface 

 of the deeply hollowed centro-dorsal simply indicate the boundaries of the radial 

 fossae. 



The articular faces of the radials of Antedon eschrichti are very characteristic. In a 

 full-grown calyx the muscle plates stand up nearly vertically, but the lower parts of the 

 faces are less steeply inclined (PL I. fig. 8«), so that the lower fossae are pretty completely 

 visible in a top view, while the muscular fossae are mostly concealed (PL I. fig. 8b). 

 They are separated from the pair of fossae below them by slanting ridges which run 

 upwards and outwards from the thickened lower end of the intermuscular ridge 

 immediately above the opening of the central canal. The lower pair of fossae above the 

 articular ridge are thus but little smaller than the upper pair which lodge the great 

 ventral muscles (PL I. fig. 8a). In smaller individuals, however, they are more unequal, 

 the upper fossa? being considerably larger than the lower ones. 



