t}02 CALIFORNIA ACADEMY OF SCIENCES. I3O 



Family FIERASFERID.F:. 



221. Fierasfer arenicola Jordan & Gilbert. 



A single specimen found in the sand at Mazatlan by 

 Dr. Gilbert. At first described as a new species, Fieras- 

 fer arenicola Jordan & Gilbert, and subsequently iden- 

 tified with the species which occurs in more or less abun- 

 dance in the shells of the pearl oyster. It was not found 

 by the Hopkins Expedition. According to Prof. Putnam, 

 the West Coast species, Fierasfer arenicola, is not dis- 

 tinct from Fierasfer dubius Putnam, of the Florida Keys. 

 We may, however, retain the former as distinct until com- 

 parison of specimens can be made. 



Family BROTULID^. 



222. Dinematichthys ventralis Gill. Plate liv. 

 Found abundant in rock pools at Mazatlan, where 



specimens were taken reaching a length of about four 

 inches. This fish has hitherto been recorded as ex- 

 tremely rare, and very few were obtained by Dr. Gilbert. 

 This is one of the species that were brought from their 

 hiding places by the introduction of the poisonous juice 

 of the Hava tree into the water. It has been recorded 

 from Cape San Lucas and Mazatlan. 



Color in life, everywhere liver brown, the fins edged 

 with whitish or pinkish. 



Family PLEURONECTID^. 



223. Syacium ovale (Gunther). 



Occasionally taken in the Astillero at Mazatlan, where 

 specimens were found by Dr. Gilbert and by us. It is 

 more abundant at Panama. The broad -headed form 

 called Syacium latifrons (Jordan & Gilbert), which has 

 been supposed, perhaps wrongly, to be the male of this 

 species, has been seen only at Panama. 



