502 CALIFORNIA ACADEMY OF SCIENCES. T30 
Family FIERASFERIDE. 
221. Fierasfer arenicola Jordan & Gilbert. 
A single specimen found in the sand at Mazatlan by 
Dr. Gilbert. At first described as a new species, /7eras- 
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, /verasfer arenicola, is not dis- 
tinct from Fverasfer 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 
ot 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 (Giinther). 
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 Syactum latifrons (Jordan & Gilbert), which has 
been supposed, perhaps wrongly, to be the male of this 
species, has been seen only at Panama. 
