380 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



jaw iucluded; scaly region of nape, beginning very close behind eye. 

 Teeth in rather narrow bands, those in onter row in both jaws con- 

 siderably enlarged, rather robust. Eyes very small, placed high, their 

 range mostly vertical; eye 6 to 7 in head, somewhat greater than the 

 narrow, flat, interorbital area. Isthmus moderate, its width 3^ in head; 

 gill-openings extending forwards but very little above opercle. 



Head naked; scales on nuchal and antedorsal regions much reduced 

 in size ; nuchal i)atch of scales beginning close behind eyes ; scales on 

 body all regularly imbricated, roughly ctenoid, those on caudal peduncle 

 largest. 



Dorsal spines low, rather slender, the tips slender and slightly ex- 

 serted, the longest spine not quite half head; soft dorsal moderate, the 

 longest rays 2| in head ; caudal slightly rounded behind, 1 ^ in head ; 

 ventrals Ij in head, the basal membrane broad, moderately developed; 

 vent midway between base of caudal and front of eye. 



Two large specimens, each about G inches long, and five smaller ones 

 were taken in fresh water near San Jose. Some (probably all) of the 

 large-mouthed specimens are males, the others females. 



9. Gobius sagittula (Giintlicr ) J. & G. 



3093G. Seven specimens were obtained from San Jose, the largest 4 

 inches long. The teeth in the upper jaw are not in a single series, as 

 described by Dr. Giinther, but form a narrow band, the outer series 

 being much enlarged and separated from the band by a narrow inter- 

 space. 



10. Philypnus lateralis Gill. 



30037. Two specimens, the largest 4i inches long, collected at San 

 Jos^. This species differs very little from the Atlantic P. dorniitator, 

 the fins, formuhe, and general proportions being the same. The adult 

 lateralis loses the dark bands along sides, but retains the black spot on 

 base of upper pectoral rays; the depth of adult lateralis (4 J in length) 

 is much greater than in dormitator, and the scales on cheeks and top of 

 head are larger. 



11. Dormitator maculatus (Bloch) J. & G. 



30939. Very numerous specimens of this species, the largest 7 inches 

 long, were procured at San Jose. 



12. Culius aequidens Jor. & Gilb. 



30943. Two specimens, one an adult 1^ feet long, were taken in fresh 

 water near San Jos6. The adult has the mouth larger (maxillary reach- 

 ing well beyond orbit) and eye snmller (contained nearly four times in 

 interorbital space) than in the type specimens of this species. 



13. Aphoristia atricauda Jord. & Gilb. 



30942. A single small specimen, li inches long, has numerous small 



