452 ■ MR. PERCY I. LATHY ON [^Pl"- 10, 



EXPLANATION OF PLATE XXXIIL 



Fig. 1. Trail s\crse section of Lead of Trout embryo with supernumerary eye. 



L. Lens df supernumerary eye. Tr. Tralieculse crauii clisi)lace(l towards 



B. Retina „ ,", left. 



R.O. Riglit normal eye. PL. Palato-quadrate bar on left side; 

 N. Riglit 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 A%(. Anterior corner of auditory capsular 



grooves in its floor, each of which cartilage, 



leads downwards into an infun- 

 dibulum and a hypophysis. 



Fig. 2. Horizontal section of head of Trout embryo with supernumerary eye. 



i. Lens belonging to the left (aborted) ' O. Functional left eye. 



tvv'in head. CL. Functional cerebral lobes. 



CL'. Cerebral lobes belonging to ditto. ; CO. Cavity of optic lobes. 

 2>rd V. 3rd ventricle belonging to ditto. OL. Optic lobes. 



C. Cranial cartilages belonging to Au. Auditory cartilage, 

 ditto. 



Fig. 3. Transverse section of the atrophied single head described above. 



L. The larger lens surrounded by i i'. The smaller hourglass-shaped lens, 

 muscle-fibres, M. ■ P. Pineal body. 



CL. Cerebral lobes. ' T. Tegminal cartilage. 



Fig. 4. Transverse section through body of Trout embryo showing local deficiency of 

 tlie notochord. 



^■p.i'. Spinal cord. Ao. Dorsal aorta. 



N.c. H.c. Neural and haemal arch carti- CEs. (Esophagus. 



lages fused together. , Be. Body-cavity. 



M-ijM^jMy Divisions of the muscle- j 



masses. 



5. On Three New Forms o£ Butterfly of the Genus HeUconiiis. 

 By Percy I. Lathy, F.Z.S., F.E.S. 



[Received April 10, 1906.] 

 (Plate XXXIV.) 



Heliconius pasithoe Cram., fulvescexs, var. n. (Plate 

 XXXIV. fig. 1.) 



5 . Upper side. Fore wmg black, with white markings as in 

 typical pasithoe Cram., bnt the aiea between discal white markings 

 and base chiefly fulvous. Hind wing black, with a long, narrow, 

 fulvous fascia loelow subcostal nei'vui'e, two obscure whitish spots 

 near apex. 



Under side. Fore wing similai- to upper side, but fulvous 

 markings paler and discal white markings slightly tinged with 

 yellow. Hind wing similar to typical pxisithoe with exception of 

 following fulvous markings : a streak along costa as above but 

 slightly wider and paler, and a short, Avide fascia from anal angle. 

 Antennfe fulvous with basal half black. 



Hah. Demerara. Coll. H. J. Adams. 



One example of this remarkable form was obtained. I am 



