THE NAUTILUS. 5 



On one visit to the South beach I found it literally strewn 

 with perfect specimens of Divaricella quadrisulcata d'Orb. 

 {Lucina dentata of my list), but never again did I find them in 

 such numbers. At another time quantities of an Area referred 

 to in my list as Area 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. (Area pexata 



_ 



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. (3) 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 



lr THE NAUTILUS, vol. 18, pp. 73-75, pi. 4, 1904. 



