20 



MEMOIRS OF THE CARNEGIE MUSEUM. 



height; predorsal area with thirteen scales, preventral area short, rounded, without 

 a distinct median series of scales; occipital process about six times in the distance 



from its base to the dorsal; frontal fontanel a very nar- 

 row sht; cheeks entirely naked; the suborbitals very 

 narrow, concealed;' mouth small, terminal; about six 

 arrow-shaped teeth on the maxillary; seven similar 

 more distinctly three-lobed teeth on the premaxillary; 

 eight similar and two conical teeth in each dentary; 

 organs of lateral line excessively developed about the 

 head, each papilla orange; no gill-rakers. 



Origin of dorsal near middle of body, its highest ray 

 four and one -half times in the length; caudal lobes four 

 to four and one-half times in the length; anal very 

 short, its origin equidistant from preopercle and caudal; 

 ventrals reaching to the anal, as long as the base of the 

 latter; pectorals reaching beyond the origin of the ven- 

 trals. Pores of lateral hne on only two scales. Scales regularly imbricate, no inter- 

 polated rows; caudal and anal naked; axillary scale minute. 



Scales of sides outlined in dark, a dusky spot over the scales with developed 

 pores. 



This species, which resembles Grundulus in many ways, is known to occur only 

 in small rills leading into the Rio Tiete and thence into the Parana, at Alto da Serra 

 near the coast at Santos, Sao Paulo, Brazil. The related genera Grundulus and 

 Spintherobolus are thus known from nearly opposite parts of South America. 



Fig. 4. Spintherobolus papil- 

 liferus Eigenmann. a, premaxil- 

 lary; b, maxillary; c, mandible. 



Genus III. Probolodus^ Eigenmann. 

 Probolodus Eigenmann, Ann. Carnegie Mus., Vol. VIII, 1911, p. 164, fig. 1; PL 

 IV, fig. 1. 



Type : Probolodus heterostomus Eigenmann. 



Premaxillary with three teeth somewhat directed outward, each with three 

 points in the angles of a nearly isosceles triangle, the middle point, which is also 

 the anterior one, much heavier; maxillary with three to five teeth, the first two or 

 three of which are directed outward; each ramus of the mandible with four larger 

 teeth, the first three directed outward, the fourth and one or more smaller ones 

 following it, directed upward; the larger teeth of the lower jaw heavy, conical, 

 with a minute cusp on each side. Lateral line complete; caudal naked. Adipose 



' 7rpo/3oXij = a putting forward; 65o6s = a tooth. 



