122 NEW YORK STATE MUSEUM 



by S. A. Miller (Cincinnati Quar. Jour. Sci., 1874, 1 1234) and 

 from the West. It has been more fully made known by Doctor 

 Ulrich (Jour. Cine. Soc. Nat. Hist., 1890, 13:112; Geology of 

 Minnesota, part 2, 1897, 3 :6y6) . 



This species which in several varieties occurs in the Trenton, 

 Cincinnati and Richmond formations, is characterized by the spine- 

 like form of the postdorsal process. Our specimen represents a 

 variety that may be peculiar of the Indian Ladder beds. One of its 

 features is the separate development of the upper end of the post- 

 medium ridge as a small rounded node. Doctor Ulrich (op. cit. 

 page 676) figures a similar specimen and remarks that it is the 

 only case of the kind seen and may be abnormal. 



Pollicipes siluricus Ruedemann 



In New York State Museum Bulletin 42 (1901, page 518) the 

 writer described as Pollicipes siluricus a crustacean from 

 the Snake Hill beds of Green island, N. Y., announcing it as the 

 first lepadid or " goose barnacle " yet known from the Paleozoic. 

 He has since learned that Dr W. S. Aurivillius had before (Bihang 

 Svenska Vet.-Akad. Handl., 28, Afd. 4, No. 3, 1892) made known 

 two species of Pollicipes and seven of Scalpellum from the Upper 

 Siluric of Sweden, thus leaving to the Snake Hill barnacles only the 

 distinction of being the first Lower Siluric or Ordovicic ones known. 



In a note on the geologic distribution of Pollicipes and Scalpellum 

 by Doctor Bather (title 46, page 112) this author suggests that 

 my figures of Pollicipes siluricus belong to more than 

 one species and that therefore a holotype of P. siluricus 

 should be selected and the species separated. Although Aurivillius's 

 species are based on differences in form of plates etc. of no greater 

 amount than those in our material, we do not deem it safe at present 

 to distinguish more than one species for the reason that the plates 

 have suffered distortion in the much contorted shales, and we there- 

 fore restrict ourselves here to designating the original of figure 17, 

 plate 2, op. cit. as the holotype. 



Technophorus cancellatus Ruedemann 

 PI. 9, fig. 17, 18 



This peculiar fossil has been described by the writer (title 47, page 

 572) from the shale of Green island, Albany county, N. Y., then 

 referred to the Utica, where it occurs in the same association as 



