CLARK: TRENTON LIMESTONE AT MARTINSBURG. 



11 



ferous portion of the Trenton limestone" at Turin, Lewis Co., N. Y. 

 I found a single plate, not absolutely identifiable, in the zone with 

 Cryptolithus, 100 feet above the base of the section, but better and 

 readily recognizable specimens were found in the Upper Trenton, 

 from 390 to 410 feet above the base. It seems probable that this is 

 the true horizon of the species. A species of Cheirocrinus, named 

 C. walcotti by Jaekel (Stammesgsch. Pelmat., 1899, p. 221, pi. 11, 

 fig. 8) is very common in certain layers low in the upper third of the 

 Trenton at Trenton Falls and, therefore, at a somewhat lower horizon 

 than the Cheirocrinus at Martinsburg. The name was proposed 

 by Jaekel largely because C. anatiformis was so poorly described as to 

 be almost unrecognizable, and a comparison of specimens shows that 

 there is very little if any difference between the two species. The 

 specimens from Martinsburg show the numerous pectinirhombs 

 which were ignored by Hall in both illustration and description, and 

 one which retains the plates of the upper part of the calyx shows a 

 series of small plates covering the ventral grooves. That Jaekel was 

 right in referring this species to Cheirocrinus instead of Echino- 

 encrinites is obvious. 



Carneyella raymondi, sp. nov. 



Plate 1, fig. 18, 19. 



Specimen small, nearly circular in outline, with a peripheral ring 

 one fourth of the diameter in width. There are six rays, five of which 

 are straight, but ray II is bifurcated about one third the distance 

 from the center to the peripheral ring, and the anterior branch curved 

 in a contrasolar direction. The supraoral plates are damaged, and 

 only three can be seen, but these are large, fully three times as large 

 as the lateral covering plates. Their outlines are mostly obhterated. 

 The interradii are covered with relatively large imbricating plates, 

 but unfortunately the anal interradius is so poorly preserved as to 

 obscure the anal pyramid. None of the rays shows any trace of 

 auxiliary covering plates. The type (M. C. Z. 3,978) and only known 

 specimen is 8 mm. in diameter. It was found by the writer, attached 

 to a shell of Rafinesquina alternata, in a layer 300 feet above the base 

 of the Trenton in the gorge of Roaring Brook, near Martinsburg, 

 N. Y. The horizon is at the base of the Rafinesquina deltoidea zone. 

 So far as is known, this is the first agelacrinitid to be found in the 

 Ordovician rocks of New York State. 



