THE NAUTILUS. 



in 



"OUR OWN" DISSECTIONS. 



These finely mounted dissections, which \vr have lately placed within the 

 reach of all progressive students and teachers of /.oology and biology, are pre- 

 pared in our laboratories by trained specialists and represent the highest type of 

 American workmanship. They are all preserved in formalin, thus retaining 

 their natural colors, and the method of mounting in the jar enables all sides 

 to he readily inspected. Their superiority over charts or models is self-evident. 

 and the favor with which they are being received proves i hat we ha\emei a se- 

 rious need of the modern educator. The dissections now ottered are: 



METRIDIUM MARGINATUM : Sen Anemone. 



An expanded specimen, sectioned longitudinally, showing alimen- 

 tary cavity with septa and sienitalia, oesophagus, etc. Price. v -l. .">(). 



ASTERIAS VULGARIS : Mui-fixlt. 



The body and three of the arms laid open, showinu stomach, liver. 

 genitalia, water-vascular system (also from heneathi. skeleton, etc. 

 In rectangular jar with polished face. Price. S4 on. 



ECHINUS NORVEGICUS: tiea I'lrhiii. 



Portions of tlie test removed, exposing interior, with alimentary 

 (anal, masticatory apparatus, uniit ilia, etc. Price. ^.'OD.l 



THYONE BRIAREUS: A'w Cucumber. 



< ipened down one side, and partially turned inside out. displaying 

 alimentary system, branchial "tree." u'enita Ma, etc. Price, si "id. 



ANCDONTA PLANA : Pond MH.W/. 



Our figure of this, perhaps the most beautiful and most complicated 

 of the series, fails to do it justice, especially in lacking the contrasting 

 tints of the actual specimen and in not showing the containing jar. 

 I'.ut it indicates fairly well the features most prominently displayed 

 the muscular system, adductors, pedal retractors and protractor, foot, 

 etc., the nervous system, ganglia, commissures, etc.; the respiratory 

 system, gills and siphons : the alimentary system, pa I pi, mouth, liver. 

 stomach, intestines, rectum, etc': the circulatory system, heart, peri- 

 cardium, aortas, etc.: the nephridia : the irenitalia: the mantle, shell, 

 ligament, etc., etc. Price, s:!.oo. 



LOLIGO PEALII : - 



Branchial chain her e\ posed by slitting the ma in le 

 side, showing various organs. Price, *1. ">(>. 



down t he si phonal 



CAMBARUS SPINOSUS: 



Viscera removed to show the nervous system. Price, ^."iii 

 KK Write tor circulars: and for list of I:K,II-:N-I f.i; A NCII IOIMUIS. .'!'_' species. 



Ward's Natural Science Establishment, 



28 TO 40 (New numbering) COLLEGE AVENUE. ROCHESTER, NEW YORK. 



