174 MEMOIRS OF THE CARNEGIE MUSEUM 



The following is a general description, applicable to all the varieties. 



Head 3.75-3.85; depth 4-4.2; D. 1,6; A. 12 or 13. 



Top of head, occipital process, dorsal plate and humeral process granular; 

 profile steep, rising with more or less of an angle from the base of the occipital 

 process. Dorsal spine striate on the sides, with weak retrorse teeth near its tip on 

 the anterior margin; posterior margin with a few similar hooks near the tip; spine 

 about equal to the head in length, the last ray two-fifths the length of the spine. 

 Base of dorsal slightly greater than its distance from the adipose, which is slightly 

 longer than the dorsal; its height 2.5 in its length. Upper caudal lobe two-fifths 

 longer than the lower; anal emarginate; pectoral spine striate above and below, 

 its outer margin nearly smooth in the adult, retrorse spines along its inner margin. 

 Humeral process broad, obliquely truncate behind, not spine-like. 



The following varieties were collected. 



One specimen, 98 mm. (maxillary barbel 115). Koriabo Rubber Plantation. 

 (C. M. Cat. No. 1617.) 



One specimen, about 127 mm. (maxillary barbel 150). Issorora Rubber Planta- 

 tion. (I. U. Cat, No. 12009.) 



Ten specimens, 53-68 mm. Creek in Mora Passage. (C. M. Cat. No. 1683 

 a-d; I. U. Cat. No. 12059.) 



One specimen, 238 mm. (maxillary barbel 270). Lama Stop-Off. (C. M. Cat. 

 No. 1608.) 



Here belongs also the macronema of Bleeker. 



Maxillary barbel extending beyond tip of caudal; vomerine teeth present; 

 upper caudal rays 2.5 in the length; eye 1-1.4 in the interorbital. 



Ashy, lateral line light; no spots. 



B. 



Four specimens, 115-253 mm. (maxillary barbel 133-238). Wismar. (C. M. 

 Cat. No. 1609; I. U. Cat. No. 12010.) 



Three specimens, about 67-108 mm. (maxillary barbel 138). Locality ? (C. M. 

 Cat. No. 1610; I. U. Cat. No. 12011.) 



114 specimens, 50-173 mm. Bartica Sand-bank. (C. M. Cat. No. 1611a-i; 

 I. U. Cat. No. 12012.) 



Two specimens, 92 (maxillary barbel 100) to about 96 mm. (maxillary barbel 

 100). Rockstone. (C. M. Cat. No. 1612; I. U. Cat. No. 12013.) 



