36 _Revrews—The Trilobite Harpes. 
incomplete in not Sea the amphibia from the Mississippian of 
Scotland and the frog from the lithographic slate of Portugal. 
A comparative table shows that in many features the Crpeas: 
pterygian fish and the amphibia approach one another. Finally, the 
high degree of specialization and complete adaptation to nearly all 
conditions of vertebrate existence of the Coal-measure amphibia is 
insisted upon. 
V.—New Yorx Strate Museum. Patzxozorc Fisuus, Erc. 
ESTORATIONS of Bothriolepis and Cephalaspis as restored by 
Patten and modelled by Marchand are figured as among the 
new items on exhibition in New York. The State mining exhibit 
at the Panama-—Pacific Exposition is described, and a report is 
given on the preservation of natural monuments. These latter, 
now added to the former trusts, are the Lester Park (or the 
“‘ Oryptozoon Ledge’’), Stark’s Knob, a dome-shaped volcanic 
knoll, the Clark reservation (a glacial park), Logan Park (where 
W. E. Logan began his official work) with its vertical ledge of 
Ordovician or Cambrian limestone-conglomerate, and the Hugh Miller 
Cliffs, Scaumenac Bay, celebrated for their Old Red fishes. All these 
places are briefly described in the Museum Bulletin 177 of the 
New York State Museum, 1915. This Bulletin also contains, we 
believe for the first time, an excellent attempt at depicting a ecological 
section by colour photography. ‘There is a short paper by Hudson on 
Porocrinus; others by Clarke on American Devonian, the Oriskany, 
and the Rifted-Relict-Mountain ; and by Miller on Trenton Contortions 
and the Rift on Chimney Mountain. Among accessions we note the 
Silas Young minerals. 
ViI.—Srrucrurt or tHE Tritosire A ARPzS. 
N preparation for a monograph on the trilobite Harpes, Dr. Rudolf 
Richter has studied the structure by means of thin sections, and 
_ has presented an outline of his main results in Zoologischer Anzerger 
, (vol. xlv, pp. 146-52, Dec. 1914). He finds that’ the pits on the 
brim (French ‘limbe’, mistranslated as ‘limb’ by several English 
writers) are not blind, as stated in text-books, but pierce right 
through. Precisely the same structure extends over a considerable 
tract “of the swollen part of the head-shield. All this perforate 
extension is composed of two distinct layers (outer and inner) of 
chitinous integument. From the inner boundary of the inner layer 
a thin ventral membrane extends below the true head cavity. ‘he 
marginal suture (on the outer edge of the brim) has been regarded as 
the ocular suture, and the under fold of integument as the free 
cheeks; and on this view depended Beecher’s conception of the 
Hypoparia. A corollary of that view was that the eyes on the upper 
surface could not be homologous with the true eyes of other trilobites. 
Richter, however, shows that the microscopic structure is quite 
opposed to that forced hypothesis. The eyes are true eyes, and 
though the ocular suture is obscured the free cheeks occupy the 
nano position. The marginal suture is, in his opinion, a special 
