142 



BIOLOGICAL LECTURES. 



actual instances of this might be cited, but the following may 

 suffice. Edinger ('95) apparently intends to apply fissiira to 

 the total fissures, and the occipital is so designated in the 

 index; but on Fig. 33 it is called sulcus. Kolliker {Entwickel- 

 ungsgescJiicJitc, p. 555) attributes j-///<r/'/j- m/r^w/wi- to Huxley, 

 who uses fissure as does Kolliker in the explanation of a 

 figure. Flower (" Proteles," Zool. Soc. Proc, 1869) applies to 

 the supra-orbital, j^i-j-wr^: and sulcus indifferently. Huxley {Vcr- 

 tcbratcd Animals) says that the cerebral surface becomes com- 

 plicated by ridges and furrows, '• the gyri and sulci "; but the 

 first of the " sulci " to be mentioned is the " sylvian fissure," 

 and the second "the fissure of Rolando," the latter also being 

 designated on Fig. 21 as the " sulcus of Rolando." Flower and 

 Lydekker {Mammals, p. 71) say "the sylvian fissure" is one 

 of the most constant of the sulci. In the last two cases the 

 generic designation of the shallower furrows is made to include 

 both kinds, and, curiously enough, this usage is apparently sanc- 

 tioned by the German committee in introducing gyri cerebri 

 and sulci cerebri as comprehensive names, and then specifying 

 certain sulci and fissurae. 



Dentatum vs. nucleus dentatus. — Two separate questions 

 are involved in the choice between these terms: {a) The use of 

 nucleus (with a masculine adjective) in place of corpus (with a 

 neuter); (b) The employment of an adjective of either gender 

 as a substantive. The latter is considered in connection with 

 callosum and dura (pp. 138-139). The substitution of nucleus 

 for corpus seems to the American committee to constitute a 

 step backward, as tending to obscure the commonly accepted 

 distinction between the part in question, with the analogous 

 part in the oliva on the one hand, and the " nuclei " ^ of origin 

 of the various nerves on the other. 



Falx vs. fair cerebri. — The German committee designate 

 the slighter fold of dura between the two lateral masses of the 

 cerebellum as falx cerebelli. The present writer prefers the 

 diminutive, falcula. The American committee has not yet 

 passed upon this case. Even should they retain /(2/^ cerebelli, 



1 The question of preference between nucleus, and ;//Vz'2/i-(.Spitzka), and nidulus 

 (C. L. Herrick) need not be considered upon the present occasion. 



