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Show 452 MR. PERCY I. LATHY ON [Apr. 10, EXPLANATION OF PLATE XXXIII. Fig. 1. Transverse section of head of Trout embryo with supernumerary eye. L. Lens of supernumerary eye. Tr. Trabecular cranii displaced towards B. Retina „ „ left. B.O. Right normal eye. PL. Palato-quadrate bar on left side; N. Right optic nerve receiving fibres the right bar is absent. from retina of supernumerary eye. S.o. Supra-orbital bar. C. Central cavity of brain with two deep Au. Anterior corner of auditory capsular grooves in its floor, each of which cartilage. leads downwards into an infun-dibuluin and a hypophysis. Fig. 2. Horizontal section of head of Trout embryo with supernumerary eye. L. Lens belonging to the left (aborted) • O. Functional left eye. twin head. CL. Functional cerebral lobes. CL'. Cerebral lobes belonging to ditto, j CO. Cavity of optic lobes. • 3rd V. 3rd ventricle belonging to ditto. OL. Optic lobes. C. Cranial cartilages belonging to Au. Auditory cartilage. ditto. I Fig. 3. Transverse section of the atrophied single head described above. L. The larger lens surrounded by \ L'. The smaller hourglass-shaped lens. muscle-fibres, 31. P. Pineal body. CL. Cerebral lobes. T. Tegminal cartilage. Fig. 4. Transverse section through body of Trout embryo showing local deficiency the notochord. Sp.c. Spinal cord. Ao. Dorsal aorta. N.c. ll.c. Neural and hnemal arch cartilages fused together. JSfu-Mg, Jf3. Divisions of the muscle-masses. CEs. (Esophagus. Be. Body-cavity. 5. On Three N e w Forms of Butterfly of the Genus Heliconius. By P E R C Y I. L A T H Y , F.Z.S., F.E.S. [Received April 10, 1906.] (Plate XXXIV.) HELICONIUS PASITHOE Cram., FULVESCENS, var. n. (Plate XXXIY. fi£: 1.) 2 . Upper side. Fore wing black, with white markings as in typical pasithoe Cram., but the area between discal white markings and base chiefly fulvous. Hind wing black, with a long, narrow, fulvous fascia below subcostal nervure, two obscure whitish spots near apex. Uncler side. Fore wing similar to upper side, but fulvous markings paler and discal white markings slightly tinged with yellow. Hind wing similar to typical pasithoe with exception of following fulvous markings: a streak along costa as above but slightly wider and paler, and a short, wide fascia from anal angle. Antennae fulvous with basal half black. Hab. Demerara. Coll. H. J. Adams. One example of this remarkable form was obtained. I am |