96 PATTEN AND REDENBAUGH. [Vol. XVI. 



(2) Haemal Nerves. page 



General course of the nerves 156 



(a) Intestinal Branches. 



Of chilarial neuromere ; passes through foramen of endocranium to 



longitudinal abdominal muscles and intestine 156 



Of opercular neuromere 156 



(b) Cardiac Branches. 



Fusion of the seventh and eighth ; relations to lateral sympathetic 

 and pericardial nerve ; distribution to integument and inter-tergal 

 muscles 156 



(c) Integumentary Branches. 



Distribution to lateral expansions of the carapace 158 



e. Nerves from the Five Branchial Neuromeres. 



General remarks; reference to typical neuromere 158 



(i) Neural or Gill Nerves. 



Distribution to gill; external, median, and internal branches 160 



(2) Haemal Nerves. 



General course 160 



(a) Intestinal Branches. 



Double nature ; anterior branch ; posterior branch 160 



Irregularity in posterior neuromeres 161 



(b) Cardiac Branches. 



Connection with lateral sympathetic and pericardial nerves, and 

 communication with the median cardiac nerve 161 



(c) Integumentary Branches. 



Innervation of the five anterior abdominal spines 162 



f. N^erves from the Post-Branchial Neuromeres. 



General remarks 163 



(i) Nerves frojn the First Post-Branchial Neuromere. 



General course 163 



(a) Intestinal Branches. 



Irregularity 163 



(b) Post-Cardiac Branch. 



Relation to the lateral sympathetic ; branch to extensor of telson .... 163 



(c) Integume7itary Branches. 



Innervation of last abdominal spine „ 164 



(2) Nerves from the Second Post-Branchial Neuromere. 



Origin, size, and general course 164 



(a) Intestinal Branches. 



Supply intestine and anastomose with corresponding branch from 

 last neuromere 164 



(b) Post-Cardiac Branch. 



Distribution to muscles of telson and epidermis 164 



(c) Integumentary Branches. 



Innervates posterior angles of abdomen and muscles of telson 165 



(3) Nerves from Third Post-Branchial Neuromere. 



Two main branches ; one to muscles of telson, the other to telson.... 165 



Intestinal nerve to anal muscles and rectum 165 



Milne-Edwards describes a rectal ganglion 165 



