56 THE NAUTILUS. 



MESESCHIZA GEOSVENORII, LEA. 



BY A. A. HINKLEY. 



A few remarks on this subject in addition to the writer's notes in 

 the NAUTILUS for May, 1901, may not be amiss. The Wabash 

 river was visited in August of the present year, at several places in 

 Posy county, Indiana. The writer was determined to find the form 

 described by Dr. Lea under the above name if it still existed. 



On the " Chains " where a stream of water passed with consider- 

 able current, the young Angitrema armigera were in large numbers 

 on the under side of the rocks. Here the Meseschiza form was 

 found quite plentiful, and some three hundred specimens were taken. 

 It is a characteristic lot of young Angitrema armigera, with the ex- 

 ception of the notch in the lip, showing all the variations of color 

 markings. The notch varies as to development and location. Of 

 the specimens taken, twenty-five per cent, or more have the notch at 

 the perifery ; in many of these a line of lighter color is left to mark 

 the former positions of the notch, this line does not precede the notch 

 on any other part of the shell. 



These notched forms were only found where the water had a 

 strong current ; and it was not confined entirely to Angitrema 

 armigera) for specimens of Pleurocera and Vivipara siibpurpurea 

 were taken in the same situation with the same peculiar notch. 



Pyrgulopsis wabashensis was found on water plants in quiet water, 

 on moss-covered rocks and timbers where there was some current at 

 the water's edge, and at the old dam near New Harmony they were 

 found in mid-stream, on rocks covered with a little moss and 

 sediment. 



DESCRIPTIONS OF NEW HAWAIIAN MARINE SHELLS. 



BY H. A. PILSBRY AND E. G. VANATTA. 



BlTTIUM HILOENSE n. Sp. Fig. 1. 



The shell has the usual oblong-turrite shape, and is uniform yel- 

 lowish gray-white except the swollen, slightly exserted first whorl, 



