690 Jacob Parsons Schaeffer. 



cated with the 'Trichter' (infundibulum ethmoidale). Henle 

 figures an accessory opening of the sinus maxillaris under the name 

 'unbestandige Communicationsoffnung.' 



Giraldes in 100 cadavers found this accessory ostium ''acht 

 bis zehn Mai." Zuckerkandl reports it present '4n jedem neunten 

 bis zehnten Falle." Chiari and Hajek found an accessory ostium 

 in every fifth case. Turner found it four times in nine dissections. 

 In a former paper I reported an accessory maxillary ostium pres- 

 ent thirty five times out of 80 specimens examined, or a percen- 

 tage of 43.75. Three of the specimens presented two accessory 

 ostia, or a percentage of 3.75. 



Since the pu1i)lication of the aforementioned paper my atten- 

 tion was directed to a report (Fourth annual report of the com- 

 mittee of collective investigation of the Anatomical Society of 

 Great Britain and Ireland) which was inadvertently overlooked 

 before. This report covers the examination of 152 specimens. 

 In this number of specimens it was found that 53 percent of maxil- 

 lary sinuses possessed but one aperture (presumably the ostium 

 maxillare); 44.1 per cent, two apertures (presumably the regular 

 ostium, and either the duplication of the latter or the pstium acces- 

 sorium) ; and 2.9 per cent, three apertures (presumably two acces- 

 sory ostia besides the regular aperture). The sinus maxillaris 

 communicated with the infundibulum ethmoidale by two aper- 

 tures (a duplication of the regular ostium) in 17.6 per cent of 

 cases. In this report no mention is made as to what is considered 

 a duplication of the normal aperture. In some cases an accessory 

 ostium is placed immediately dorsal to the infundibulum ethmoi- 

 dale, in fact is very often continuous with the infundibulum. 

 I imagine that some of the latter cases are included among the 

 17.6 per cent of specimens. Unless the opening were wholly in- 

 cluded within the dorsal end of the infundibulum I considered 

 the aperture as an accessory ostium, communicating directly 

 between the sinus maxillaris and the meatus nasi medius, and not 

 as a duplication of the ostium maxillare proper. With this fact 

 kept in mind the above report agrees closely with the figures in my 

 former paper and also w4th the results obtained in the following 

 series. 



