38 THE NAUTILUS. 



Potamopyrgus coronatus (Pfeiffer). Taken from a muddy 

 bottom in a sheltered place near a building. Many are smooth 

 with a dark line in place of the row of spines. 



ACROSS THE LAKE FROM LAGUNA were a number of dried-up 

 pools on the railroad right-of-way, which contained dead 

 specimens of the following species : 



Succinea recisa (Morelet). 



Aplexa fuliginea (Morelet). 



Aplexa tappanensis guatemalensis (Crosse & Fischer). 



Planorbis orbiculus (Morelet). 



Planorbis cnltratus (D'Orbigny). 



Planorbis sp. ? 



Planorbula obstructa (Morelet) var. anodo-nta (Pilsbry). 



Soon after passing out of the east gate of Guatemala City, 

 the road descends into a deep ravine with a creek at the 

 bottom; here the only species was Aplexa fuliginea (More- 

 let) ; it was also taken in the basins of fountains in the city. 



OUT OF THE NORTH GATE the road is bordered by a row of 

 large cedar trees on either side for a half-mile or more, to a 

 cedar grove, then to the edge of a deep ravine where the 

 road-bed is cut out of the high, irregular, precipitous slope 

 until a much lower level is reached, and the road soon ends at 

 the tapia baths. Farther down the canyon can be seen the 

 reservoir. In the cedar grove were found : 



Drym&us alternans (Beck). 



Drymccus jonasi (Pfr.). 



Helicina sp.? One specimen. 



Pachycheilus largillierti (Philippi). Immature specimens 

 were very numerous in the large pool, the individual rooms 

 and the stream. The only mature specimen found was dead 

 and bleached. From the reservoir were taken : 



Pseudosuccinea championi (Von Martens). One specimen 

 only. 



Aplexa fuliginea (Morelet). 



Physa sp. Varies from smooth to costate forms. 



Planorbis caribcrus Orb. 



Segmentina obstructa (Morelet), var. anodonta (Pilsbry). 



Gundlachia hinkleyi Walker. 



