MOLLUSKS AND BRACHIOPODS COLLECTED IN SAN DIEGO, 
~ — GALTFORNIA. 
BY F. W. KELSEY. 
For the benefit of collectors of Mollusca and Brachiopoda, the author 
has compiled, as nearly as possible, a complete list of recent marine 
species to be found at San Diego, California. 
The species listed have been collected within a district bounded by a 
a coast line not exceeding twenty-five miles in length, and in but a few 
instances going beyond a depth of two hundred fathoms. 
San Diego is so situated as to afford special advantages to the collector 
of mollusks, as a great variety of collecting ground is accessible within a 
limited area, and the climate is so mild as to make collecting not only 
possible, but pleasant at all times of the year. 
San Diego Bay affords an unusually interesting as well as prolific field 
” for the conchologist, owing to the variety of ground awaiting his conquest. 
At extremely low tides the nature of the ground uncovered ranges 
through all stages from a black, oozy mud, at the head of the bay, to the 
white beach sand at its entrance. ‘ 
The grass flats opposite La Playa, are found well stocked with ever- 
varying sea life, and it is extremely interesting to note the changes in 
the molluscan population, as one species after another finds its way into 
the sheltered portions of the bay, eae numerous today and tomor- 
row disappearing again. 
On the Government Reservation, at the northern end of the bay, at a 
point about midway between Quarantine Station and Ballast Point, is a 
colony of rock borers, several species of which inhabit the sandstone left 
bare at middle tide ; while still lower, among the moss-covered rocks, we 
find numerous Chitons and several species of Ocinebra, Muricidea, Pleu- 
rotoma and Odostomia. ; 
The coarse gravel of Ballast Point contains its share, but gives it up 
only after hard labor; for the toothsome clam seems to be aware of the 
fact that he is popular, and the collector generally earns the savory din- 
ner which he carries home in his basket. 
The rocks of the Government Jetty are alive with rock dwellers, 
including many species of Littorina, Chlorostoma, Acmaea, Purpura, 
