REPORT ON THE CRINOIDEA. 345 



1. Metacrinus angulatus, u. sp. (Pis. XXXVIII., XXXIX.). 



Dimensions. 



Greatest length of stem, terminating at the tlurt3'-fifth node, 

 Diameter of stem, ...... 



Longest cirrus (fifty-seven joints), .... 



Diameter of calyx, ...... 



Diameter of disk, ...... 



Length of arm (one hunJred and ten joints), 



Length of large distichal pinnule (twenty joints), 



Length of first pinnule after tertiary axillary (twelve joints), 



Stem robiLst, with a sharply pentagonal outline. Eight to twelve internodal joints 

 with but slightly crenulated edges. Their faces are distinctly stellate, while the ano-les 

 are sharpened and slightly produced outwards ; and their sides bear strong horizontal 

 ridges, the edges of which are coarsely denticulate. Nodal joints more distinctly stellate 

 in outline and without horizontal ridges. The cirrus-facets reach closer to their upper 

 than to their lower edges, while the supra-nodal joints are slightly incised to receive the 

 bases of the large cirri, which are mostly directed upwards, and are longest at the twelfth 

 node. They usually consist of forty-five to fifty -five stout joints, which are very uniform 

 in appearance except at the two ends. The lower joints are c^uite short, and the tlistal 

 edges are longer than the proximal ones, so that the joints seem to have slight dorsal 

 projections at their distal ends. The interarticular pores terminate between the tenth 

 and twelfth nodes. 



Basals widely hexagonal, united into a complete ring, and rather prominent on the 

 exterior of the calyx. They are much higher in the middle line than at the lateral edges, 

 and the lower angle is often produced considerably downwards over the upper stem- 

 joints. Four radials, the first comparatively short and the second a syzygy with a 

 pinnule on the epizygal, the third also bearing a pinnule and the last axillary. Rarely 

 more than three divisions of the rays, which arc in close apposition, being only separated 

 by the bases of the large lower pinnules. Forty to fifty arms, generally consisting of about 

 one hundred .slightl)^ overlapping joints beyond the last axillary. Primary arms of six 

 to ten distichals (usually eight or nine), of which the second or third is a syzygy. 

 Secondary arms of ten to fourteen palmars, sometimes as many as twenty, the third of 

 which is usually a syzygy. Tertiary arms rare ; consisting when present of fourteen to 

 thirty joints, the third of which is a syzygy. There is generally a syzygy in the third 

 brachial of the free arm. Another somewhere between the tenth and thutieth brachials, 

 and others at intervals of six to twelve joints. 



A pinnule on the epizygal of the second radial, and on the first joint after each 

 axillary. The first pinnules, as far as the beginning of the secondary arms, are much 

 larger than their successors, consisting of about twenty joints, the lowest of which are 



(ZOOL. CH.VLL. EXP. PART XXXII. — lSS-1.) K -44 



