204 BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



ACANTHOMYSIS COLUMBIAE (Tattersall) 

 Figuees 80-82 

 Neomytis columbiae Tattersall, 1933, p. 12, figs. 5, 6. 



Occurrence. — Monterey Bay, Calif., 1928, 1 adult, 1 immature male, 

 1 nearly adult female, 14 mm. 



Distribution. — The type specimens were collected in British Co- 

 lumbia. The occurrence of the species on the California coast is 



Figure 80. — Acanthomysis columbiae (Tattersall) : Anterior end of male specimen from 

 California to show rostral plate and spines, eye, antennular peduncle, and antennal scale, 

 for comparison with specimens from British Columbia (Tattersall, 1933), X 44. 



interesting and marks a considerable extension of its known geograph- 

 ical range. 



Remarks. — This very distinct species may be recognized by the fol- 

 lowing characters : 



(1) The last thoracic somite is furnished with two ridges and two 

 furrows ; there are similar grooves and ridges on the first abdominal 



