287 



HOLO. 



collections at Rupert Narrows near Bloomsburg, Ool. Co., Pa., 

 from low CatsMll leds. YIII-IX, 



Holoptychius (scale and piece of rib) in specimen 902-3^ 

 Sherwood's coll. at Mansfield, Tioga Co., Pa., from Upper Che- 

 mung^ VIII-IX, 



Note.— Mr. Agassiz named the Holoptyohius noUUssimus 

 in his Researches sur les poissons fossiles in 1843, and Hall 

 published his identification of it in Northern Pennsylvania in 

 the same year. But descriptions of the Scotish forms came to 

 us in the winter of 1840-41. It was in the spring of 1841 that 

 I happened to find perhaps the first specimen in America, as I 

 was riding down the dug road on the north bank of the Oowa- 

 nesque in Tioga county. I thought at first sight that it was; a 

 small tortoise asleep by the roadside. When I dismounted and 

 picked it up I recognized it as one of the dorsal plates of an 

 Old Red fish surrounded by the marginal fragments of the 

 other plates. I sent it with other collections to Philadelphia, 

 but the box never reached its destination. Expressage was 

 unknown forty-eight years ago. 



Homalonotus dekayi, {Dipleura dekayi,) Hall, page 



VIILC __«««^ ^^^ % 84, 1. Vanuxem, 



page 150, fig. 36, 1. Rog- 

 (ers, page ^^"1%^ Marcellus 

 ( Vanuxem ) ; Hamilton, 

 (Hall.) See Green's 

 monograph of trilobites, 

 1832. Hamilton,— {CIslj- 

 pole's specimens from 

 Barnett's mills,Perry Co., 

 Hamilton upper shales 

 (5-96,two; 5-99) ; Jeri- 

 cho school house (54-3) ; 

 Crawley hill (94-3, 7, 13, 

 14,) from Hamilton upper 

 fossil ore led. — In Hun- 

 tingdon Co., in Hamilton upper shales, 50' below Tully lime- 

 stone, at Cove Station (T3, 107) ; near Grafton (p. 109) ; bed 5, 

 Mapleton section (p. 273) ; at Huntingdon (p. 109) ; Rough and 

 Ready, in Hamilton upper sandstone (p. 110) — YIII c. 



Hall 81^. 



