6 Bulletin" 23 32 



Commencing on the basals, a groove is continued up through 

 the radials and costals, branches into the distichals on the second 

 (2nd) costal. Plates with the exception of the basals flat, the 

 radials and brachials only slightly convexed by the longitudinal 

 groove. Plates ornamented with raised lines, radiating in pairs 

 or by threes from, but not showing in the centers of the plates. 

 These lines pass across the sutures of the plates. Sutures dis- 

 tinct only between the lower plates of the dorsal cup, becoming 

 very indistinct on passing upwards. Beyond the third series of 

 (nterradials the sutures are not visible, the lines of ornamentation 

 on the p'ates becomes single, producing a net-like appearance. 



First (1st) interradials hexagonal in shape, longer than wide,. 

 and supported on the upper sides of the radials and first (1st) 

 costals. These are followed by the second (2nd) series of inter- 

 radials consisting of two plates which are irregularly hexagonal 

 in shape and wider than high. The third (3d) series of inter- 

 radials consist of three (3) plates. Above this series the suture 

 "lines becomes indisticnt. 



Radials, first (1st) costals, first (1st) and second (2nd) interradials 

 have ornamentation lines of three (3) each, the two lateral ones 

 shorter than the middle line and passes nearly to the middle of 

 the plates. Other plates have only one ornamental line passing 

 across the sutures of the plates. 



Observations ; 



This specimen is from the McGraw quarry zone from which 

 Trichotocrinus harrissi n. sp. was obtained. 



Summary of known species of Melocrinidae from the Portage 

 formation. 



Melocrinus clarkei (Hall) Williams. 



bainbridgensis (Hall) Whitfield. 

 williamsi n. sp. 

 reticularis n. sp. 

 {Trichotocrinus) /tarn's i n. sp. 

 In the Chemung rocks at Chemung Narrows and various other 

 localities is found a large species of Melocrinid crinoid whose 

 stem is often several feet in length. The head of this crinoid has 



