964 REPORT—1896. 
of Thelyphonus correspond absolutely with sections through the nasal tube of 
Ammoceetes; here in the one section is the projecting camerostome, there is the 
corresponding projection of the olfactory protuberance, here is the sense-epithelium 
of the lower lip or hypostoma, there is the sense-epithelium of the upper lip or 
hood. Here, as fig. 9 shows, the mouth tube passes in the ventral middle 
line to where it turns dorsalwards into the middle of the conjoined nervous mass 
Fie. 9. 
JOTOCHORD 
NOTOCHORD —S 
Oral Cuma 
tee ec 
A.—Median sagittal section through head of young Thelyphonus. 
B— ,, 5. a Pe a ES Ammoceete (after Kuppfer). 
C- 4, A t, ig » full-grown Ammoccete (after Kuppfer.) 
of the supra- and infra-cesophageal ganglia. There the nasal tube ends blindly at 
the spot where the infundibular tube lies on the surface of the brain. 
Further, the topography of corresponding parts is absolutely the same in the 
two animals: in the dorsal middle line the rostrum, with the two median eyes near 
its extremity ; in the corresponding position the two pineal eyes ; below this, in the 
middle line, the camerostome: corresponding to it in the Ammoceetes the olfactory 
