134 THE NAUTILUS. 



resulted in finding 19 good specimens and a numbci of dead and 

 broken ones, the latter looking as if some small rodent had broken 

 them to get the animal for dinner. This shell has been named and 

 described by Dr. Pilsbry in the Nautilus, Vol. 22, page 138, as 

 Gcelocentrum hinkleyi. At the base of the bluffs the walking was 

 good to what it had been below, and here are found Macroceramus 

 mexicanus, Holospira hinkleyi, Schasicheila hidalgoana, Streptostyla 

 gracilis, Streptostyla supracostata, Helicina vanattce and a few dead 

 Euglandina corneola and Euglandina oblonga potosiana ; also a few 

 specimens of a number of other species. 



On the 8th of February the same bluffs were again visited. This 

 time an early start in the morning put the writer on the ground before 

 the sun made the climb uncomfortably warm. The entire day was put 

 in around the bluffs and resulted in near fifty good specimens of the 

 fine Ccelocentrum, but no additional species were added to the first 

 half-day's work. 



During the day a nest of small bees was encountered. This nest 

 was made of the same material as our hornets' nests ; it was trumpet- 

 shaped, big end up, and stood at an angle from the rock to which it 

 was attached. Being open, the bees could be seen within ; they re- 

 sented the presence of a stranger by buzzing about my face, but made 

 no attempt to sting. 



Standing on an elevated point of rock, which was reached after a 

 little climb, a good view of the valley was before me. Through this 

 valley the Mexican Central Railroad passes in nearly a straight line» 

 The valley is cut up into small farms, occupied mostly by people 

 froija the United States who are clearing the land and planting 

 sugar-cane, orange trees, bananas, and growing some vegetables, 

 making homes for themselves in this mild southern country. 



A COMPARISON OF THE TJNI0NID5; OF THE PEARL AND SABINE RIVERS. 



BT L. S. FKIERSON. 



A collection of Unios from the Pearl River, at Jackson, Miss.,. 

 made by Mr. A. A. Hinkley, proves of remarkable interest, when 

 compared with the Unios of the Sabine River, Texas ; these two 

 rivers being so far apart., and separated by the immense " bottom " 

 of the Mississippi, which area has, in large part, a different set of 

 inhabitants. 



