THE NAUTILUS. 5 
On one visit to the South beach I found it literally strewn 
with perfect specimens of Dvivaricella quadrisulcata d’Orb. 
(Lucina dentata of my list), but never again did I find them in 
such numbers. At another time quantities of an Arca referred 
to in my list as Arca americana Gray, were found. It is more 
elongated than those found in the harbor, with a thinner and 
lighter brown periostracum, and probably represents only a 
variety or ocean form of A. campechiensis Dillw. (Arca pexata 
Say). 
Lucina philippiana Reeve (Loripes edentula of my list). Large 
single valves were frequently found and occasionally at the 
mouth of Hospital creek shells were found in the mud with 
both valves intact, but like the Phacoides filosa Conr. in Portland 
harbor, Maine, always dead. It may also be of interest to note 
that two specimens of Solemya velum Say, and a few single 
valves of Mya arenaria were found on the north beach, the 
most southern records for the species. 
Panopea bitruncata Conr. (5) This large and variable shell 
which was referred to in my list under both Glycimeris reflexa 
Say, and G. americana Conr., was later the subject of a paper 
by the writer’ in which the synonymy was straightened out, 
and a fine specimen found on the bar east of Marsh island was 
figured. Common in the pliocene of the Caloosahatchie, but 
recent examples are exceedingly rare. Living deep in the mud 
they are difficult to obtain, unless on rare occasions extensive 
harbor dredgings might bring some to the surface. They are 
also very apt to be destroyed by changes such as encroaching 
sand bars, sedimentary deposits, and harbor pollution. 
The rocks that represented the ruins of the old Spanish 
lighthouse (the tower of which fell in June, 1880, while the 
keeper’s house had fallen several years before) were a favorite 
place for Thais floridana Conr. (Purpura haemostoma var. floridana 
of my list). During my recent visit I failed to find a living 
specimen of this species either on the ledge or jetties, but the 
tides were not very low and it may be that they could have 
been found at a lower tide. On all of the rocks including the 
1THE Navrtiuuvs, vol. 18, pp. 73-75, pl. 4, 1904. 
