74 MEMOIRS OF THE CARNEGIE MUSEUM 



In the following table the distribution of the species obtained is given. Species 

 not obtained by me but reported by others have their approximate locality indicated 

 by an asterisk. The number of specimens of each species obtained is given in 

 the appropriate column under the several localities specified, thus indicating for 

 each locality the relative abundance of the respective species found thereat, as 

 well as the localities where each species was most numerous. For several unique 

 localities the lists here given are repeated on subsequent pages. 



The columns are not quite of equal value. Under the head of Lama Stop-off 

 are given all specimens obtained between Maduni Stop-off and Cane Grove Corner. 

 Few came from the latter place, most of them from Lama Stop-off, which is between 

 the other two. The specimens from the Georgetown trenches include those from the 

 Botanic Garden. The specimens from the northwestern coast include all those 

 taken in and near Morawhanna, i. e., Mora Passage, Aruka River, Koriabo Rubber 

 Plantation, Issorora Plantation. The Kumaka column includes specimens from 

 the Demerara River and its tributaries between Kumaka and Christianburg, a 

 distance of several miles, and from some distance farther down the Demarara 

 itself, at some mud-flats. The Rockstone column contains specimens from 

 Rockstone itself, from the sand-bank just above Rockstone, and from a stream 

 on Gluck Island across from Rockstone. The columns from Crab Falls, Tumatu- 

 mari, Potaro Landing, Tukeit, Savannah Landing and Holmia contain similar 

 groups of habitat. In all of these cases a radius of a mile would probably include 

 all of them. I do not know how much Rupununi includes, but certainly Twoca 

 Pan, and a creek opposite Massara Landing. All the specimens from this region 

 were collected by Mr. Grant. Where a species was abundant in the Georgetown 

 market the sign of infinity is substituted for the definite number of specimens 

 preserved. 



The water of the lower Demerara (see Figure 1) and of the ocean for some 

 distance out is muddy. This muddy water is inhabited by a peculiar fauna. It is 

 rich in Aspredinince, Ariince, Mugil, Anableps, Scicenidce, several sharks, and a sting- 

 ray. In so far as these have any relation to the strictly fresh-water fauna they 

 are included in the present report. No sharp line has been or can be drawn. No 

 species has been omitted which should be included, but some of the species included 

 should probably be excluded. This is notably true of some of the Scicenidce, Centro- 

 pi mi idee, and Mugilidce which are generally distributed in the West Indies. The 

 Aspredinince, Ariince, and Anableps more clearly belong to the South American 

 estuarial fauna and all properly belong here. Most of the fishes brought to the 

 Georgetown market come from the estuaries or coast. 



