Revieivs — A. H. Foord's Catalogue of the Cephalopoda. 325 



ceratidcs, Endoceratidce, Actmoceratidee, Gomphoceratidce, Ascoceratidtre, 

 Poterioceratidcs, and Cyrtocerntidce. The present volume contains 

 the remainder of the Nautiloidea, consisting of the families LitiutidcB, 

 Trochoceratidce, and Nautilidce. The family Bactritidce was inserted 

 by the author in the Table of the Nautiloidea which he gave in his 

 Introduction to Part I., but in the Introduction to Part II. he states, 

 " On reconsidering the question of the affinities of Bactrites (the 

 sole representative of the family Bactritidce), in the light of the 

 investigations of Branco and Hyatt, I am now pi*epared to accept 

 the systematic position assigned to it by those authors — that is, at 

 the commencement of the Ammonoidea. Bactrites will therefore be 

 dealt with in Part III. instead of in this volume." 



From a Table appended to the Introduction giving the " Distri- 

 bution of Genera and Subgenera of Nautiloidea described in Parts 

 I. and II. of the present Catalogue, with the number of species 

 assigned to each," it is seen that there are in the Museum 573 

 species included in the Nautiloidea, 459 of which are Palaeozoic, 

 93 Mesozoic, and 21 Cainozoic. The Palaeozoic species are dis- 

 tributed in 29 genera and 6 subgenera, the Mesozoic in 4 genera 

 and 2 subgenera, and the Cainozoic in 2 genera and 1 subgenus. 



The author commences the present volume with the Lituitidte, 

 which family includes the genera Litidtes, Ophidioceras, and Anris- 

 troceras ; the last-named genus does not appear to be represented 

 in the National Collection. The first is represented by the well- 

 known L. lituus from the Orthoceras limestone of Sweden, and 

 possibly by one British species. To the genus Litidtes, J. de Carle 

 Sowerby referred several British species which he described in 

 Murchison's ' Silurian System.' Prof. Blake, in his Monograph of 

 the British Fossil Cephalopoda, Part I., retained in this genus only 

 one of these species, viz. ibex, and associated with it in the same 

 genus, though with a query, some specimens which he identified 

 with Trochoceras arietinum of Barrande. Mr. Foord replaces this 

 latter species in Trochoceras, and refers the ibex of J. de C. Sowerby 

 to Lituites with a query, I'emarking that " the presence of Lituites in 

 the British rocks must, for the present, be considered as A^ery far 

 from satisfactorily determined." 



OpJiidioceras, which is known only in the Silurian of England 

 and Bohemia, was regarded by its founder Barrande as a subgenus 

 of Litidtes, but Prof. Blake regards it as a distinct genus only 

 " remotely related " to Lituites, while Hyatt places it near to 

 Ascoceras. Mr. Foord considers it to be a distiuct genus "whose 

 alliance seems to be clearly with Lituites.'" 



In Trochoceras, the genus representing the Trochoceratidce, and 

 ranging from the Cambrian to the Devonian, the author describes 

 two new Silurian species, each founded upon a single specimen. 

 The one. Trochoceras boreale, collected by Captain Inglefield in the 

 Silurian rocks at Wellington Channel, Arctic America, is a smooth 

 species, and is stated to be " much larger than any of those of the 

 Niagara rocks of North America that come at all near to it." The 

 other, from the Woolhope Limestone, at Hay-Head, East of Walsall, 



