68 
fibrils of the muscular tissue being out of the question. In the 
snake and newt the bands composed the tissue of the auricles, while 
a collection of these bands into fascicles appeared and was measured 
in the ventricles; the measurements will show many parallel in- 
stances, and one in which the fascicles appeared in the auricle and 
the bands in the ventricle. The numbers in the table represent the 
diameters of the fibres in vulgar fractions of an English inch, and 
where one only occurs it expresses the average size. The terms 
auricle and ventricle, under the column headed “‘ Muscle,” refer to 
the heart. The animals, unless noted to the contrary, were adults 
that had been dead some time before they were examined. In 
making many of the measurements I have been indebted to the kind 
assistance of Mr. Siddall. 
Table of Measurements of the Fibres of the Heart and of some Muscles 
of Voluntary Motion in Vertebrate Animals. 
Diameter. 
Animal. Muscle. 
In the Heart. ao Bang 
Cercopithecus sabzus, Desm.|Ventricles ...... '1-1333 to 1-1000 
Guillet eenseceseaccinetetsenecsarecsse= ne 1-1000 to 1-666 
C. griseo-viridis, Desm. ...... Ventricles ...... Ditto 
Gullet ....... seo boeaes Beiseskes hours Ditto. 
C. Athiops, Geoff. ......+++++- Ventricles ...... Ditto 
Gullet. ....0s0s0 cet asa salegccantcane Ditto. 
Macacus Rhesus, Desm....... Ventricles ...... 1-1000 
Gules Seeits. cheese. areneacte saveeee-(1-800 to 1-555 
M. Innuus, Desm. .....0-000:: Gullet ....... HE eee e. cab seveeeees[1-666 to 1-500 
Cebus capucinus, Geof’. ...... Guillet). esa. s00.|e0 Sop cheb p capeneies 1-800 to 1-500 
Lemur albifrons, Geoff. ......|Diaphragm ......|.... Tees 1-666 to 1-300 
Plecotus auritus, Geoff. ...... Right ventricle...|1-1600 to 1-800 
Pectoral ...... senltcateeecseonadcendtes 1-888 to 1-571 
OE thie ear Reece. ARE Sea ee 1-1143 to 1-666 
Vespertilio noctula, Schred. .|Ventricles ....../1-2000 to 1-1000 
Vespertilio Pipistrellus, @mel.|Ventricle .........|1-2000 to 1-1067 
Guillet «<<. tegen nch¢ abies dap sae see. 1-1333 
Erinaceus Europeus, Linn....|Ventricles ...... 1-2666 to 1-1000 
Cutaridous “1. 25 )fst Bae 1-1000 to 1-571 
Guillet PTX ie) eee ALS e 1-1000 to 1-500 
Sorex tetragonurus, Herm..../Ventricles  ......]1-2666 to 1-1333 
Pectoral ....... Se eens rane ame E 1-555 
GLE ae i RP ee 1-1145 
Talpa Europea, Linn. ......|Ventricles ...... 1-3000 to 1-1133 
GUlletivess accents levees .acesva- suey eee 1-1333 to 1-660 
Nasua fusca, Desm........ ess. (Gullet ....... Revit cued lpeardy. Saas ..|1-888 to 1-333 
Ursus labiatus, Blainv. ...... Left ventricle ...|1-2000 to 1-1000 
Ursus Americanus, Pall. ...|Ventricles ...... 1-1500 to 1-666 
Left auricle ...... 1-2000 to 1-800 
Gullet ...... Busts s|ecane sete thirties .-.{1-800 to 1-373 
Canis familiaris, Zinn. ...... Auricles and ven- 
tricles .....:... 1-2400 to 1-800 
Gullet .......... pel Sccrckceskenteans ....{1-800 to 1-400 
Diaphragm: s....:|escrecverpoes ene «....{1-800 to 1-285 
— 
