156 
Psyche 
[December 
tral, project beyond the tip of the terminal segment. These 
are visible only under the best conditions of lighting and 
were apparently missed by Bruch. 
Two “eye-spots”, apparently nothing more than tiny 
optically light areas, are present near the outer lateral 
margins of the head. These are essentially no different 
from other such areas which occur sporadically on several 
other parts of the body (see pi. 13, fig. d), but may be 
significant in that they are larger and uniform in size 
and are evident at the same location in every specimen 
examined. 
Maxilla tripartite ; maxillary palp 4-segmented, the third 
segment greatly swollen and ovoid. The labium appears 
to be degenerate in comparison with that described by 
Seevers and Dybas for Cephaloplectus mus, although ad- 
mittedly this structure could be seen only in ventral view 
in our material. Two segments are visible, the distal one 
subglobose and with no appendages other than the palps 
evident. Segmentation in the labial palps is apparently 
obsolescent. 
The mandible consists of a well sclerotized piece, the 
distal portion of which is divided into a “molar” projection 
terminating in several sharp teeth, and a thin, nearly trans- 
parent “incisor area”, edged by numerous seriate denticles 
barely within the limit of light resolution. The incisor 
area has never been described in other limulodid genera 
but may have been overlooked due to its almost invisible 
structure. 
Paralimulodes does not differ much from Limulodes and 
Cephaloplectus in thoracic structure. Contrary to the claim 
of Bruch, the prosternum is not a distinct piece, but merges 
into the pronotum anteriorly by a pair of narrow arms. 
Posteriorly it is free and overlaps the mesosternum and 
anteromedian metasternal projection. 
The tarsus is two-segmented, the basal segment sub- 
Explanation of Plate 12 
{Paralimulodes wasmanni Bruch; Lawrence Co., Ala.). — Fig. A, out- 
line, dorsal view, showing habitus. Fig. B, dorsal view, with abdomen 
distended by treatment with KOH. Fig. C, ventral view, abdomen also 
distended. (Sculptural detail not shown). 
