426 Mr. H. G. Smith on Three new 



The specimens I have examined were mostly full-grown 

 slugs ; and after thirteen dissections the only difference I 

 was able to discover was one similar to that pointed out above 

 by Dr. ScharfF, viz. in the point of the origin of the retractor 

 muscle of the penis. The reproductive, digestive, and nervous 

 systems all support Simroth's statement that this slug is but 

 a colour- variation of L. maximus. 



Any malacologist possessing a knowledge of the colour- 

 variations of even our British slugs cannot, I think, consis- 

 tently, and certainly not scientifically, found species upon 

 the same. Jourdain * has stated that such differences in the 

 Limacidse as general form, coloration, structure of the shell, 

 jaw, &c. are characters which vary with age and habitat, and 

 that for specific distinction recourse must be made to the 

 internal anatomy. 



Of late I have frequently drawn attention f to the import- 

 ance of a knowledge of the anatomy of the MoUusca, and it 

 is to be regretted that Mr. Roebuck should, in the face of 

 statements from able anatomists such as I have mentioned, 

 persist in confusing an already very complicated subject. 



LIV. — Descriptions of Three new Species of Butterflies cap- 

 tured by Mr. D. Cator in British North Borneo^ in the 

 Collection of Mr. Qrose Smith. By H. Grose Smith. 



Papilio Catoris. 



Male. — TJpperside. Both wings white, with black veins and 

 markings. Anterior wings with four irregular oblique bars 

 crossing the cell and extending to the costal margin, the first and 

 third bars interrupted; beyond the cell is a large black irregular 

 patch extending above the lower discoidal nervule and below 

 the uppermost median nervule ; broad black streaks extend 

 along the middle and lower median nervules and the sub- 

 median nervure, the two lowest streaks being connected by a large 

 black quadrangular spot ; between the veins is a curved sub- 

 marginal row of conical black spots, the uppermost being the 

 largest and protracted inwardly. Eight triangular black 

 spots at the ends of the veins, connected with each other on 

 the margin, the two uppermost at the apex being confluent ; a 

 black line on the inner margin widest near the base. 



* ' Oomptes Rendus,' vol. ci. p. 963 (1885). 



t Cf. Ann. & Mag. Nat. Hist. vol. ix. p. 308 (1892) ; ' The Slugs of 

 the British Isles/ p. 1 (1892) ; ' The ConcJiologist/ vol. ii. p. 56 (1892). 



