Herrick, Tendejicies in Nomenclature. 167 



This last usage has much to commend it. The compilers 

 of this report, feeling that the double ambiguity of nidus is 

 absolutely fatal to its application in this connection and recog- 

 nizing that none of the other terms proposed have met with 

 general acceptance, are constrained to recommend the contin- 

 ued use of nucleus when a Latin term is necessary. 



(e) metencephalon, i6, Am., 9, Eu., 7. 

 rhombencephalon [His], 13, Am., 6, Eu., 7. 

 myelencephalon, 4, Am., 3, Eu., i. 



hind brain (cereb. -j- medulla), i, Am., i. 



The confusion prevailing here is largely a morphological 

 one. The term metencephalon in some cases expressly ex- 

 cluded the cerebellum, in others it was left ambiguous; this 

 term was used twice in addition to those above, where it was 

 expressly applied to the cerebellum alone. 



(f ) aquaeductus Sylvii, 18, Am., 4, Eu,, 14. 

 mesocoele, 13, Am., 10, Eu., 3. 



iter, II. Am., 11. 



mesocoele = iter -|- optocoeles, I, Eu., I. 



(g) ventriculus quartus, fourth ventricle, 24, Am., Ii, Eu. 13. 

 metacoele, 16, Am. 12, Eu., 4. 



rhombocoele, i. Am., i. 

 (h) epiphysis, 36, Am., 23, Eu., 13. 

 corpus'pineale, 3, Eu., 3. 

 glandula pinealis, 3, Eu., 3. 

 conarium, i, Am., i. 



Besides the above, one American writer uses epiphysis for 

 the outgrowth connected with the brain, pinealis and paraphy- 

 sis for those which become separated. 



(i ) hypophysis, 39, Am., 23, Eu., 16. 



pituitary body, 5, Am., 2, Eu. 3. 

 (j) neuraxis, 12, Am., 8, Eu., 4. 



myelencephalon, 11, Am., 6, Eu., 5. 



cerebro-spinal axis, 7, Am., 3, Eu., 4. 



neuron, 5, Am., 4, Eu., I. 



central nervous system, i. Am., I. 

 5. yes, II, Am., 8, Eu., 3. 



no, 21, Am., 9, Eu., 12. 



It is obvious that our hope of being able to deduce from 

 these replies a standard or norm of current nomenclature has 



