. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SEA MUSSEL MYTILUS EDULIS. 175 The osphradia are pigmented organs of dark brown color which lie ventral and lateral to the visceral ganglia (fig. 169, Os, p. 178). They extend as far as the inner side of the gill supports, each one covering an area about equal to that of the visceral 163 Fig. 163.—Diagrammatic representation of the nervous system of Myiilus edulis. A PN, anterior pallial nerve. .4 RN, anterior renal nerve. ASO, abdominal sense organ. BrN, branchial nerve. BuN,
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SEA MUSSEL MYTILUS EDULIS. 175 The osphradia are pigmented organs of dark brown color which lie ventral and lateral to the visceral ganglia (fig. 169, Os, p. 178). They extend as far as the inner side of the gill supports, each one covering an area about equal to that of the visceral 163 Fig. 163.—Diagrammatic representation of the nervous system of Myiilus edulis. A PN, anterior pallial nerve. .4 RN, anterior renal nerve. ASO, abdominal sense organ. BrN, branchial nerve. BuN, buccal nerve. CC, cerebral commissure. CGt cerebral ganglia. CPC, cerebropedal commissure. CVC, cerebrovisceral commissure. DPN, dorsal pallial nerve. DRBN, dorsal retractor byssus nerve. E, eye. OpN, optic nerve, Ot, otocyst. OtN, otocyst nerve. PA d, posterior adductor muscle. PAX, posterior adductor nerve. PdG, pedal ganglion. PdN, pedal nerve. PDPN, posterior dorsal pallial nerve, PPdN, posterior pedal nerve. PRN, posterior renal nerve. PVPN, posterior ventral pallial nerve. SN, syphonal nerve. VG, visceral ganglion. \'RBN, ventral retractor byssus nerve. The abdominal sense organs, first described by Thiele (1889) in Area, were found by List (1902) to be present in some form or other in all species of the Mytilidae. In Myiilus edulis they lie on the ventral posterior side of the posterior adductor muscle just outside of the gill supports. A microscopic cross section of a mussel taken through the oosterior adductor muscle just behind the visceral ganglion will show the relative. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Fish Commission. Washington, The Commission, Govt. Print. Off
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