164 PROCEEDINGS OP THE ACADEMY OF [1883. 



base of each inferior spine, and a large one at the anterior ex- 

 tremity of the inferior branch, looking partially outwards. 



Measurements. m. 



Length of base of three inferior spines, inch, . 'OOSS 

 Length of inferior spines, inclusive, . . . '0055 

 Length of anterior inferior spines, . . . '0045 

 Length of inferior branch of bone, . . . -0140 

 Discovered by Mr. J. L. Wortman, Castle Creek, Idaho. 

 Cottus hypoceras sp. nov. 



The preoperculura of this species differs widely from those of 

 the three already described. Although it has four spines, they 

 are distributed differently', three being inferior and one posterior, 

 instead of two posterior and two inferior. The base of the pos- 

 terior spine is less compressed than in the others, and looks as 

 though the apex is directed posteriorly instead of superiorly as in 

 C. divaricatus, and C. pontifex. It is opposite the inferior branch 

 instead of above it as in the species named. The angular spine is 

 round at the base ; the first inferior is compressed at the base, and 

 the anterior is compressed to the rounded apex, its superior edge 

 being acute, the inferior rounded. This spine therefore differs 

 from that of anj- of the other species. 



The external face is gently rounded, and is smooth. The 

 internal face has the usual excavation with bordering rim, and is 

 roughened. There are no foramina except two above the base of 

 the anterior inferior spine. In size this species is about like the 

 C. pontifex. 



3Ieasu7^ements. m. 



Length of base of four spines, inclusive, in a 



straight line, 'Oil 



Length of bases of anterior two inferior spines 



inclusive, 'OOY 



Length of angular spine, . . . . . '004 

 Elevation of vertical limb of preoperculum, . . "012 



One specimen ; obtained by Mr. J. L. Wortman, probably at 

 Willow Creek, Oregon. 



PERCIDiE. 



The spines of the dorsal fin of a species of this family are not 

 rare in the formation, but I have not yet been able to fix them 

 generically or specificall}^ 



