88 THE NAUTILUS. 



ception, showed the outer branchiae charged with ova, most of them 

 containing youug embryones. At the same time their gonads con- 

 tained ova in various stages of development in the inferior parts, 

 and sperma, mature and immature, in the superior and usually 

 more anterior parts, both elements being in somewhat various pro- 

 portions as to quantity and the space occupied. In one specimen 

 sperma bearing nuclei were not distinctly seen, but microscopic ex- 

 amination showed spermatozoids among the ova, the two evidently 

 mixed up artificially. 



The shells of these specimens were of somewhat different shapes: 

 a part had the inferior margin evenly curved, while in others it 

 was more straight, or even slightly sinuous in the middle, still others 

 being intermediate. These differences are regarded as indicating 

 sexual differences in other (true) Anodonta? by many conchologists, 

 and it remains to prove or disprove that by examining large num- 

 bers of specimens. 



SAN DIEGO, CALIFOKNIA, AS A COLLECTING GROUND. 



I!V F. W. KELSEV. 



This subject has probably been thoroughly discussed by collectors 

 far better versed in conchology than I, but a few lines from this 

 quarter may be of interest to those who, like myself, are compara- 

 tively speaking, novices. 



About two years ago I began to feel an interest in shells, other 

 than that caused by a mere admiration of their diversified forms, 

 colors, markings, etc., and since that time, I have spent much of my 

 spare time collecting, studying, and classifying the many mollusks 

 which abound in our bay and in the waters of the adjacent coast. 



The weather and other circumstances permitting, I spend at least 

 two Saturdays of each month collecting, and the following list of 

 species obtained on my last trip, Saturday, October 29th, will give 

 the reader some idea of the variety of little rock dwellers of this 

 locality. 



On the above date, my wife and I landed in a skiff on the reef 

 extending out from Pt. Loma, just below the light-house where 

 several acres of rocks are laid bare by the receding tide. We 

 hunted from noon until four o'clock among the eel grass, sea anem- 

 ones, ribbon kelp and rocks, with such keen enjoyment that we 



