124 MULIYIL NARAYANAN. 
DESCRIPTION OF PLATE IX, 
Illustrating Mr. Narayanan’s “ Notes on the Anatomy of 
Scorpions.” 
List of Reference Letters. 
st. Sternum (fused sternites of the fifth and sixth somites). V. séc., 
VI. ste. Sternocoxal processes of the fifth and sixth cephalothoracic appen- 
dages. V,., VI, Bases of the second sclerites of the same appendages. 
VII. G. O. Genital operculum. VJJI. p. Pectines. «. Sternite of the eighth 
somite. IX. sty. Stigmata leading into the pulmonary sac containing the 
appendage of the ninth segment. pr. Sub-opercular plates. d.m. Depressor 
of the operculum. m.ad. Transverse (adductor) muscle of the operculum. 
Fic. 1.—Region of the genital operculum in a male Scorpio fulvipes 
viewed from the ventral aspect; the opercular plates closing over the genital 
aperture in the natural position. N.B.—The opercular plates are shown as 
very slightly divaricated from one another, as after they have been turned 
forwards two or three times with a needle they do not return absolutely into 
their natural position. 
Fic. 2.— View of the same specimen, but with the opercular plates turned 
forwards. The muscles here shown lie, of course, beneath the transparent 
skin. 
Fic, 3.—Similar view to Fig. 1, but of a female specimen. 
Fic. 4.—Similar view to Fig. 2, but of a female specimen. Here the 
genital aperture is clearly visible. 
N.B.—The existence of fifteen teeth to the comb in the male specimen and 
of fourteen in the female is noteworthy. ‘The figures were drawn from the 
object by Mrs. A. G. Bourne. 
Professor A. G. Bourne has observed in seven males of Scorpio fulvipes 
the following numbers for the teeth of the right and left pectines respectively :— 
15-15, 13-138, 15-16, 15-14, 16-16, 15-15, 15-16. And in three females 
the following numbers—12-13, 14-14, 14-14. In both series the specimens 
were taken by hazard from amongst a number without reference to the 
numeration of the comb-teeth. 
