. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 B. \V. BKLMAN AND T. J. CHILI)RESS RESULTS of flic blood I'asenlar system Present knowledge of crustacean blood systems is not comprehensive. Only a few species are well known, and for most of these, only the arterial system has been examined in any detail i Maynard, 1960a; Pillai, 1965; Seaton, 1971). No detailed account of the anatomy of the blood system in the Mysidacea exists, al- though Delage (1883) and Alexandrowicz (1955) provide some information on the structure of the heart and arterial system in Mysis and Pramu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 B. \V. BKLMAN AND T. J. CHILI)RESS RESULTS of flic blood I'asenlar system Present knowledge of crustacean blood systems is not comprehensive. Only a few species are well known, and for most of these, only the arterial system has been examined in any detail i Maynard, 1960a; Pillai, 1965; Seaton, 1971). No detailed account of the anatomy of the blood system in the Mysidacea exists, al- though Delage (1883) and Alexandrowicz (1955) provide some information on the structure of the heart and arterial system in Mysis and Pramuis , respectively. The anatomy of the arterial system and of the return pathways in G. ingcns was examined in eight individuals. Injection of Evans Blue into the heart or pericardial chamber caused this dye to be circulated throughout the arterial system and rendered the transparent vessels visible. Similar injections of dye into the ventral sinus channels in living animals enabled the return pathways to be mapped. In three individuals, a silicone rubber injection material (Microfil, Canton Biomedical Prod- ducts) was injected into the arterial system, allowed to set, and the resultant casts dissected free and examined. The heart. The heart in C. inyens is a single chamber, generally tubular in shape, extending throughout the posterior half of the thorax. It is suspended within the pericardial sinus although tending to lie toward the lower surface of the chamber. Ligaments attach both dorsally and laterally along its entire length. Structurally the heart appears similar to that in other mysids (Gadzikiewicz, 1905). Observa- tions of the beating heart in rii'o suggest that the contraction begins near the ostial openings and proceeds as a peristaltic-like wave in both the anterior and posterior directions. The temporal sequence in the normal heartbeat therefore is similar to that in Holopedium ( Storch, 1931). Systole and diastole are apparently not dis- crete events t
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