APPENDIX. 341 



refers to his life-work as " a contribution towards the knowledge 

 of a single character among the many that must be taken into 

 account in making a natural classification." 



Several other recent attempts to classify the mollusca upon 

 single or partial characters are equally or more incongruous ; 

 and were therefore omitted from my chapter on classification. 



On Collecting and Arranging Shells [p. 290]. 

 The new liquid glues sold by stationers, such as " Uoyal," 

 "Chase's," " Lepage's," etc., are highly recommended for 

 attaching specimens to the cardboard labels. They have a 

 great advantage in being alwa3's ready for use, but do not 

 possess sufficient body to fix heavy specimens in every position 

 desired ; this deficiency may be supplied by the use of yellow 

 wax, which maj^ be moulded to an^'^ shape required, and then 

 attached with the glue both to the cardboard and specimen. 



[Vol. II.] 

 CEPHALOPODA. 



[P. 46.] 5th line from bottom, instead of " liassic," read 

 "Jurassic." 



AcANTHOTEUTHis, Wagner [p. 48]. 



PHRAGMOTEUTHis, Mojsisovics, 1882. Triassic ; Europe. A. 

 bisinuatus^ Bronn. 



Orthoceras, Breyn [p. 51]. 



5th line from bottom, instead of " L. Silurian," read " Cam- 

 brian." 



ENDOCERAS, Hall ; CAMEROCERAS and DiPLOCERAS, Conrad. 



The two groups, Endoceras and Cameroceras, appear to be 

 very closely allied, if not identical forms ; the latter being 

 founded upon a species (C. Trenton ejisis) possessing an inner 

 sheath or tube which is permanently attached to the septa in 

 precisely the same manner as that of Endoceras, and differing 

 simply in its lateral position, beaded form, and moi'e gradual 

 expansion ; the tube of Endoceras, moreover, is not always cen- 

 tral. Its expansion is more rapid, when it occurs ; there are 

 also occasionally additional and apparently free tubes within the 

 first or permanent tube of Endoceras, which do not occur in 

 Cameroceras. 



Diploceras appears to have possessed an inner tube of large 

 size, surrounded by septa and an outer tube, the inner tube being 

 near one side of tlie outer one ; it also is probably identical with 

 Endoceras. — Whitfield, Geol. Wisconsin, iv, 228. 



RHYNCHORTHOCERAS, Rcmcle, 1881. ( Ancisti'oceras, Boll [part], 

 1857.) 0. Breynii, Boll. L. Silur. ; Grermany. 



