152 Miscellaneous. 



eluding even some of the Oldhamioe, Eophytons, and Fucoids. Nor 

 does he seem to be aware that two head-portions of Pah^opyge 

 (p. 167) have been found and published, thus removing it from the 

 category of the doubtfuls. 



Dr. Nicholson's illustrations are numerous and apt. They have 

 been selected for the most part from such as the Geological Survey 

 of Canada, Principal Dawson (author of 'Acadian Geology '), the 

 publishers of D'Orbiguy's ' Cours eleraentaire,' and, he might have 

 added, Page's ' Text-book ' and his own ' Text-book of Zoology ' have 

 supplied hira with. Why the wretched Ventriculite at p. 70 should 

 claim its paternity so boastfully from " Lyeil "' is not clear. That the 

 authorship of some only, and not of all the cuts (often as they may 

 have been used before), should have been acknowledged is to be re- 

 gretted ; for if the real origin of all the figures were carefully indi- 

 cated, the student might have the opportunity of learning something 

 more of the history of genera and species by referring to the original 

 observers. Not but that many authors are mentioned in the text : 

 by following, however, a good example in this matter, such as 

 Dana's excellent ' Manual of Geology,' Dr. Nicholson would have 

 improved his well-designed book ; and he would probably have been 

 reminded that the Russian Mammoth skeleton (p. 445) is always a 

 puzzle to tyros on account of its unexplained head-skin and shapeless 

 hoofs, that the Ichthyosaur at p. 369, with outlined body, ought to 

 have a fluked tail in the figure as well as in the text, and that Mr. 

 S. V. Wood's fine Alligator-relic, at p. 367, is an upper and not a 

 lower jaw. 



MISCELLANEOUS. 



Anatomical Investigations on the Limuli. By A. Milne-Edwards. 



On June 26, 1869, I communicated to the Philomathic Society 

 the first part of an investigation which I had just made upon the 

 anatomy of the Limuli ; and a short abstract of this communication 

 was inserted in the ' Bulletin ' of that learned Society and in the 

 ' Journal de I'lnstitut.' This memoir, accompanied by numerous 

 figures, ought to have been printed soon afterwards ; but the unhappy 

 circumstances under which France laboured in 1870 and 1871 

 prevented its publication, and it is only now that I am able to bring 

 it out in its entirety. 



The fii'st notions that we possess as to the internal organization of 

 the Limuli date from 1828, and are due to Strauss-Diirckheim. 

 Ten years afterwards Van der Hoeven published on the whole group 

 a very carefully executed monograjih ; but aU the anatomical part of 

 his work, which was studied by means of individuals preserved in 

 spirit, leaves much to be desired, and we observe in it serious errors, 

 which, however, it was almost impossible to avoid under the 

 circumstances in which this author found himself. 



About the same time Duvernoy added some details to what was 

 previously known as to the respiratory apparatus of the Limuli. In 



