. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North America. 175 c'. Ultiuiatesegment of abdomen smooth. Outer branch of uropoda but little more than half as long as inner branch. Sinus at extremity of ab- domen small £>. glabra, sp. n. It has been suggested by several authors * that Dynamene may prove to be the female of JScesa, but until facts can be produced to substantiate this assumption, it is necessary to retain the genus Dynamene. 21. Dynamene dilatata, sp. n. Body oval; surface very granular;

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. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North America. 175 c'. Ultiuiatesegment of abdomen smooth. Outer branch of uropoda but little more than half as long as inner branch. Sinus at extremity of ab- domen small £>. glabra, sp. n. It has been suggested by several authors * that Dynamene may prove to be the female of JScesa, but until facts can be produced to substantiate this assumption, it is necessary to retain the genus Dynamene. 21. Dynamene dilatata, sp. n. Body oval; surface very granular; colour yellow. Head rugose, with its anterior margin produced in a quadrangular process, having a small median projection, rounded antero-lateral angles, and a thickened edge. First Fig. 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 London, Taylor and Francis, Ltd

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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology