cheliped 



anterolateral border 



Figure 3. — Schematic drawing of brachyuran crab in dorsal view ; areas of carapace indicated ; legs 

 of right side only shown ; b., basis ; cp., carpus ; d., dactyl ; i., ischium ; m.. merus ; p., propodus. 



opposite side. The petasma may terminate distally 

 in various combinations of complex-shaped lobes. 

 According to position, these have been termed: 

 distolateral, distoventral, and distomedian. Addi- 

 tional complex processes may also be present. 



Pleurobranchia. — Gills attached to lateral wall 

 of body dorsal to the articulation of an appendage. 



Podobranchia. — Gills attached to the coxa of an 

 appendage. 



Postorbital groove. — Groove on carapace behind 

 orbit, and more or less parallel to margin of orbit 

 (% 2). 



Propodus (protopodite). — Second article from 

 the distal end of a leg or maxilliped. In a cheliped, 

 t he propodus consists of a palmar portion and a 

 narrower, immovable finger. 



Prosartema (dorsal eye brush). — Long, thin, 

 ciliated lobe arising dorsally from proximomedial 

 border of first antennular segment and extending 

 anteriorly ; found in family Penaeidae. 



Protogastric lobe. — Lobes or subregions which 

 are the anterolateral lobes of the gastric region. 



Protopodite. — Peduncle of an appendage; in 

 unmodified form, it consists of one coxal and one 

 basal article. 



Pterygostomian region. — Triangular space on 

 ventral surface of carapace, on either side of buc- 

 cal cavity in Brachyura. Region at anterolateral 

 corner of carapace in Natantia. 



Pterygostomian spine. — Spine at anterolateral 

 (anteroventral) corner or border of carapace 

 (fig- 2). 



10 



FISH AND WILDLIFE SERVICE 



