92 PATTEN AND REDENBAUGH. [Vol. XVI. 



2. The Endoskeletal System. 



a. The Endocranium. pagb 



Muscles attached to endocranium 109 



Processes, " occipital ring " 109 



Branchial bars 109 



Foramina iio 



b. The Abdominal Endochondrites. 



Location, muscles attached, and processes 110 



c. The Branchial Cartilages. 



Lankester's description no 



Location and function no 



Resemblance to capsuliginous bars of endocranium in 



3. The Muscular System. 



Reference to Benham's paper in 



Muscles attached to endocranium ; plastro-coxals, tergo-proplastrals, lat- 

 eral proplastro-tergals, plastro-tergals, plastro-entapophysials, longi- 

 tudinal abdominal muscles in 



Inter-tergal muscles 113 



Haemo-neural muscles 113 



Veno-pericardiac muscles ; their neural attachment to the membrane 



spanning the venous-collecting sinus 113 



Muscles of caudal spine; flexors and extensors 114 



Anal muscles 114 



The Cheliceral Muscles. 



Tergo-coxal muscles (of Lankester), or muscles of first joint 115 



Muscles of second joint 116 



Muscles of third joint 117 



The Muscles of the Second, Third, Fourth, and Fifth Appendages. 



Plastro-coxals and tergo-coxals, or muscles of coxopodite 117 



Muscles of basipodite 117 



Muscles of ischiopodite 118 



Muscles of mero-carpopodite 118 



Muscles of propodite 118 



Muscles of dactylopodite 118 



Muscles of inner mandible 120 



The Muscles of the Sixth Appendage. 

 Comparison of the muscles of other thoracic appendages ; muscles of 

 distal joints 120 



The Muscles of the Chilaria. 

 Muscles attached to occipital ring, posterior portion of endocranium, and 

 haemal side of carapace 122 



The Muscles of the Operculum. 

 Reference to Lankester. Extensors or adductors, flexors or abductors, 

 internal branchials, and branchio-thoracic muscles 124 



The Muscles of the Gills 124 



4. The Digestive System. 



The mouth, mandibles, oesophagus, proventriculus, intestine, rectum, 

 anus, and liver 124 



