. Annals of the Lyceum of Natural History of New-York. Science. Isthmia ventricosa Morse. Animal.—Dorsal and cephalic portions of body, and tentacles jet black. Disk long, narrow, rounded at extremity ; anterior portion of disk dark slate, becoming lighter towards caudal extremity. Tentacles short, very bulbous ; base of tentacles approximating. Cephalic lobes conspicuous. Buccal plate wide, narrow, not produced in centre, but slightly curving at ends; cutting edge regularly waved. Fig. 2. Fig. 8. Buccal plate of I. ventricosa. Lingual membrane of I. ventricosa. Lingual formula 98,-13-1-13 ; c
. Annals of the Lyceum of Natural History of New-York. Science. Isthmia ventricosa Morse. Animal.—Dorsal and cephalic portions of body, and tentacles jet black. Disk long, narrow, rounded at extremity ; anterior portion of disk dark slate, becoming lighter towards caudal extremity. Tentacles short, very bulbous ; base of tentacles approximating. Cephalic lobes conspicuous. Buccal plate wide, narrow, not produced in centre, but slightly curving at ends; cutting edge regularly waved. Fig. 2. Fig. 8. Buccal plate of I. ventricosa. Lingual membrane of I. ventricosa. Lingual formula 98,-13-1-13 ; central and lateral plates notched at outer posterior corners. Central olate |quare, having three small den- ticles. Plate indented at base of central denticle, which is the 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 Lyceum of Natural History (New York, N. Y. ). New-York :
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