1903.] NATURAL SCIENCES OF PHILADELPHIA. 729 



Three examples from Bracciaiio, the data otherwise like preceding. 



(No. 348.) 



Ninety-five examples from Italy, also with same data. (No. 412.) 

 This species, originally from the lakes in the State of Rome, is easily 



distinguished from the other species of Atherina by the slender body. 



Atherina sardinella sp, nov. Plate XLI (upper figure). 



Head 4; depth 5; D. VII-I, 11; A. I. 13; P. I, 12; V. I, 5; 

 scales 46 to base of caudal ; 20 before spinous dorsal ; 10 between spin- . 

 ous dorsal and base of ventral ; width of head 2^^ in length ; depth of 

 head 1|; snout 3^; eye 3^; maxillary 2f ; interorbital space 3^; pec- 

 toral 14; ventral 2; caudal peduncle, from base of last dorsal ray, a 

 little shorter than head; least depth of caudal peduncle 4^. 



Body elongate, fusiform, greatest depth about ventral fin. Sides 

 compressed, slightly flattened. Caudal peduncle elongate, slender, 

 compressed, and its least depth near base of caudal. 



Head elongate, attenuate, compressed, not broad behind eyes where 

 greatest width is found. This is also widest part of body. Side of 

 head more or less flattened and constricted below. Snout above, and 

 interorbital space flattened, with three low longitudinal ridges extend- 

 ing posteriorly over latter but not beyond eyes. Top of head posterior 

 to eyes and interorbital space convex. Snout long, conic, pointed 

 and not broad. Eye moderately large, anterior, and hardly impinging 

 on upper profile. Mouth moderate, oblique, and lower jaw protruding. 

 Maxillary narrow, slightly curved, and reaching posteriorly a little be- 

 yond front rim of orbit. Mandible conspicuous, moderately large, 

 not broad, and each ramus elevated somewhat inside of mouth. Teeth 

 distinct, small, sharp-pointed, conic, and in several series forming 

 narrow bands in jaws. Vomer with conspicuous patch of small conic 

 pointed teeth. Palatines with short narrow band of similar teeth. 

 Tongue with small patch of minute pointed teeth, rather far back. 

 Tongue small, far back in mouth, elongate, free along sides, and united 

 with floor of mouth by a median frenum. Nostrils lateral, rather 

 high, and in front of eye above. Interorbital space a little wider than 

 snout. Postocular ridge distinct. 



Gill-opening large and carried forward till nearly below front rim 

 of orbit. Gill-rakers long, compressed, slender, numerous, and longer 

 than longest gill-filaments on first arch. Gill-filaments numerous, and 

 short on hypo and ceratobranchials. Pseudobranchiic large, much 

 longer than longest gill-filaments. Isthmus long, narrow, branchi- 

 ostegal membrane united by a narrow frenum in front. Lower 

 surface of isthmus with rather broad groove. 



