328 Reviews — A. R. FoorcVs Catalogue of the Cephalopoda. 



parison." Doubtless he meant to have said that the siphuncle has 

 not been seen in the adult stage, for in his description of semiundatus 

 (p. 280) he observes, " The siphuncle in a young individual (No. 

 36603), If inches in length, is very near the inner (dorsal) margin 

 of the septa." The position of the siphuncle then, so far as it is 

 known, constitutes another point of agreement with Sowerby's 

 N. simplex. 



As the author has not been able with abundant material before 

 him to determine to what maturer form Sowerby's small specimen 

 of N. incequalis belongs, we quite agree with him that it is much 

 better to drop the name altogether. The specific determination of 

 very young Nautili is often absolutely impossible. 



Passing on to the genus Aturia we notice, that while Edwards in 

 his Monograph of the Eocene Mollusca (Pal. Soc. 1849) described 

 and figured two varieties of the well-known Aturia ziczac, Mr. 

 Foord reserves this name for the form figured by J. Sowerby in 

 plate i. of his Mineral Conchology, and gives a new name, A. Charles- 

 loorthi, to the more compressed shell which Edwards distinguished 

 as var. /3. The latter comes very near to the Dax shells Aturia 

 Aturi, Basterot, but the differences in the suture-line and the amount 

 of compression are considered sufficient to justify the separation of 

 the species. As to the Nautilus lingulatus, v. Buch, from the Eocene 

 of Kressenberg, Bavaria, Mr. Foord concurs with Dr. Geinitz in 

 referring it to Aturia ziczac, J. Sowerby, sp. 



The concluding section on the Nautilidoe deals with the Ehyn- 

 cholites or the mandibles of fossil Nautiloids. Various names 

 have been given to these fossils, and various opinions have been 

 entertained as to the advisability of referring them to genera and 

 species. Although it has been suggested that Ehyncholites may be 

 of more importance for the purpose of classification than the guards 

 of Belemnites, Mr. Foord refrains from referring them to genera and 

 species, (1) owing "to the want of stable characters upon which 

 to found genera and species," and (2) because the material is not 

 " sufficiently abundant to enable one to trace the variations that may 

 arise in different stages of growth, and thus to afford data for the 

 limitation of such species as may be constituted," and he adds, 

 " Under these circumstances I have merely figured some of the 

 principal types of the fossil beaks met with in the Jurassic and 

 Cretaceous rocks of England which, so far as I am aware, have 

 not been illustrated." The figures are exceedingly good, and in 

 addition to the fossil beaks the author gives some admirable 

 figures of the upper and lower mandibles of the recent Nautilus 

 [Nautilus pompilius). 



Dr. K. A. von Zittel, writing in 1884 (Handb. d. Palseont. Band II. 

 p. 386), states that hitherto lower mandibles have been found only 

 in the Muschelkalk. Mr. Foord's examination of the National 

 Collection has, however, enabled him to record and figure specimens 

 from the Lias of Lyme Eegis and the Lower Chalk of Dover. 



The Ehyncholites are so rarelj'^ associated with the Cephalopod 

 to which they belong, that the specimens of Nautilus Libanoticus 



