. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . 15 PLATE O. Fig. 1. Canthocamptus illinoisensis, antenna oMemale. Fig. 2. fifth foot of female. Fig. 3. antennule. Fig. 4. firstfoot. Fig. 5. caudal stylet. Fig. 6. CantJiocamptus northumhricus^ var. americanus, fifth foot of 7. antenna of female. Fig. 8. * maxilliped. Fig. 9. caudal stylet. Fig. 10. antenna of male. Fig. 11. first foot. Fig. 12. fourth foot. Fi
. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . 15 PLATE O. Fig. 1. Canthocamptus illinoisensis, antenna oMemale. Fig. 2. fifth foot of female. Fig. 3. antennule. Fig. 4. firstfoot. Fig. 5. caudal stylet. Fig. 6. CantJiocamptus northumhricus^ var. americanus, fifth foot of 7. antenna of female. Fig. 8. * maxilliped. Fig. 9. caudal stylet. Fig. 10. antenna of male. Fig. 11. first foot. Fig. 12. fourth foot. Fig. 13. fifth foot of male. Fig. 14. frontal area. Fig. 15. CantJiocamptus tenuicaudis, 16. fifth foot of female. Fig. 17. Cyclops serridatus, fifth foot. .Fig. 18. fourth foot. Fig. 19. outer ramus of first foot. Fig. 20. Cantliocamptus northumbricus, inner ramus of third male 21. beak. Fig. 22. maxilla. MINNESOTA ^CRUSTACEA. J2 *>^ AnnualRfport PLATE O. Geol & 2^at Hist. PLATE P. Fig. 1. Heart of Simocephalus vetulus. a, tendons attached tolateral walls of heart, b, venous opening of heart, c,muscular bands supporting the abdomen, connected bytransverse bands, d, cells of nutritive matter hiding thearterial opening, e, thin membrane seen in sectionwhich separates the venous from the arterial blood cur-rents, is in focus near the side, but its situation in thecenter is shown by the dotted line. Above this or out-side it is the attachment of the powerful antennaryand mandibular muscles, f, posterior arterial sinus, g,brood-sac. h, alimentary canal with thick glandularcell walls, i, shell gland or excretory organ, j, power-ful muscles supporting and moving the abdomen. Fig. 2. An early stage of the embryo of Daphnia schcefferi. a,anus, n, nutritive globules or fat drops characteristicof the summer embryo. m\ m\ outer and inner enve-lope of the embryo. This is a nauplius stage, but notthe first or proper nauplius. The portion darkly shadedis nut
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