14 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
be ascertained at this time. I suspect that this situation represents 
new species in the early stages of formation. 
It is interesting to note that Hewitt (1967) cites two records of P. 
cranchii (which are actually P. satyrus) from the “buccal cavity” 
and “jaws and skin’ of Zsurus oxyrinchus and Galeorhinus australis. 
Dinemoura latifolia was collected from both of these sharks. 
As previously indicated, adult females of the three species in the 
mouth were pigmented less noticeably than adult females of the same 
species that occurred on the surface of other hosts. Two possible 
explanations come to mind. First, the pigmentation may be influenced 
by the amount of light available to the copepod, those in the mouth 
receiving less. Second, the pigmentation may be influenced by the 
amount of pigmentation of the shark at the point of attachment of 
the parasite. From my own observations of other parasitic copepods, 
I favor the latter explanation. Often parasitic copepods assume the 
color of the host tissue to which they are attached, or those parasites 
with little or no pigment are associated with lighter areas and the pig- 
mented forms are on darker areas. Many questions basic to under- 
standing this departure remain unanswered. Most of these deal with 
the life history process about which practically nothing is known. No 
attempt at a definitive explanation is offered here, but rather I have 
presented the situation in the hope that future investigations will shed 
more light on this interesting situation. 
