LIGIA. 99 



Plate III. 



Fig. 1. Dissection of the arterial system from the dorsal 

 side. The main arterial trunks are drawn 

 somewhat larger than they are naturally. For 

 the sake of clearness, details of the anatomy 

 have been omitted. (ab. art.) abdominal 

 artery; (cer. g.) cerebral ganglion; (cr. art.) 

 crural artery; (ep. art.) epimeral arteries; 

 (gen. art.) genital artery; (hep. art.) hepatic 

 arteries ; (ht.) heart ; (int. art.) intestinal 

 artery; {lab. art.) lateral artery; (med.ao.) 

 median aorta; (op. a.) ophthalmic artery; 

 (ost.) ostium ; (vent, art.) ventral artery ; (i-vii) 

 thoracic arteries. 



Fig. 2. Arteries of the left side of ventral surface of 

 head and first thoracic segments, (ant. art.) 

 antennal artery; (fac. art.) facial artery; 

 (mand. art.) mandibular artery ; (mx 1 '.) artery 

 of first maxilla; (moc".) artery of second 

 maxilla; (mxp'.) artery of maxillipede ; (oes. 

 art.) oesophageal artery. Other references as 

 in the preceding figure. 



Fig. 3. Afferent vessels of the superior lamella of one 

 of the abdominal appendages injected with 

 indigo-carmine from the sternal sinus. 



Fig. 4. The nervous system, seen from above after the 

 removal of the muscles and viscera, (ab. g.) 

 abdominal ganglion; (ant. n.) antennary 

 nerve; (g-n.) nerve to stomach; (med.n.) 

 median nerve; (m.p.n.) nerves of mouth 

 appendages; (op. I.) optic lobes; (sub-oes. g.) 

 sub-oesophageal ganglion; (Th'.g.) first 

 thoracic ganglion. 



