N. A. INVERTEBRATE PALAEONTOLOGY. 729 



spect to the trausition of so-called species from one of the stages to 

 another, but emphatically agrees with Heilprin as to the impossibility 

 of subverting the accumulative stratigraphic evidence, to the eflect that 

 the relative superposition of the several principal stages — the Buhr- 

 stone, Claiborne, Jackson, and Vicksburg groups — cannot be otherwise 

 than 'as heretofore ascertained in hundreds of localities by others as 

 well as by himself. 



HiLGARD, E. W. — The Old Tertiary of the Southwest. Amer. Jour. Sci., 

 3d ser., vol. xxx, pp. 266-269. October, 1885. New Haven. 

 Criticises Dr. Otto Meyer's views as expressed in the June and July 

 numbers of this journal. Does not attach much importance to Plagi- 

 ostoma dumosum as a significant fossil. Considers Area Mississippiensis 

 as the most characteristic Vicksburg fossil. For the Jackson age the 

 most constant fossil is the Zeuglodon and also Venericardia planicosta, 

 which has nowhere been found associated with the characteristic Vicks- 

 burg fauna. Through this widely diffused and universally recognized 

 shell, as well as through the almost equally constant Gastridium vetus- 

 turn and Calyptrophorus velatus as common fossils, the Jackson fauna 

 connects strikingly with the Claiborne and Buhrstoue beds, and the 

 author has found this Venericardia in the latter in almost immediate 

 contact with the Upper Cretaceous rocks of North Mississippi. Upon 

 Dr. Meyer's assumption, the Vicksburg beds, void of both of the above 

 types, would actually be intercalated between this oldest post-Creta- 

 ceous fauna and the Claiborne and Jackson beds. However, his as- 

 sumption is abundantly and conclusively disproved by the most direct 

 stratigraphical evidence. 



HiNDE, G. J. — Description of a New Species of Crinoids with Articulating 

 Spines. Annals and Magaziyie of Natural History, 5th ser., vol. xv, 

 pp. 157-173, pi. vi, and fig. p. 163. March, 1885. London. 

 Describes the new genus Hystricrinus^^^^Artliroacantha. Williams, in- 

 valid, and the new species Hystricrinus Garjjenteri from the Middle De- 

 vonian at Arkona, Ontario, Canada. The peculiarity of the species 

 consists in movable spines. 



HiNDE, G. J. — Notice of Hystricrinus Carpenteri, a Criuoid with Artic- 

 ulating Spines. Amer. JVat, vol. xix, p. 706. July, 1885. Philadel- 

 phia. 



This specimen, from calcareous shales of the jMiddle Devonian at Ar- 

 kona, Ontario, was described by Mr. G. J. Hiude in the Ann. and Mag. 

 Nat. Hist, March, 1885. The genus is identical with Arthrocanthiis 

 (Williams), a name preoccui)ied among the Rotatoria. 



Hyatt, Alpheu.s. — Structure of the Siphon in the Endoceratidaj. 

 Pruc. A. A. A. S., vol. xxxiii, part ii, pp. 490,491. 1885. Salem. 



Abstract. Describes the structure of the siphon of Endoceras and 



