5 36 PROFESSOR E. RAY LANKESTER, 
‘ LIMULUS. 
3 
om Tergites. Sternites. Appendages. 
mT Camerostome (small/Small chele. 
tubercular _ sclerite) 
in front of the mouth. 
2g Chel 
3 
The fused pro- and|Chele. 
—| Cephalothoracie carapace | mesothoracic stern- 
4 ites (a narrow elong- 
with central and peri- 
5 | pheral eyes. 
7 |Narrow emarginate area 
at the anterior border 
of the abdominal cara- 
pace. No dorsal pits. 
8 |1st pair of lateral spines. 
Ist. pair of dorsal pits 
and entapophyses. 
9 |2nd pair of lateral spines. 
2nd pair of dorsal pits 
and entapophyses. 
Abdominal carapace. 
ate sclerite stretch- 
ing from the mouth|Chele. 
to the chilaria). ed 
The chilaria or paired| Digging legs. 
metastoma, or meta- 
thoracic sternites. 
Soft integument and/Genital operculum. 
stigmatic pits (mus- 
cular), posterior to 
base of operculum. 
Epistigmatic pair of|lst gill-book pair 
sclerites and stigma-| projecting. 
tic pits. 
Epistigmatic pair of/2nd gill-book pair 
sclerites and stigma-| projecting. 
tic pits. 
