prbit eyestalk 



rostrum 



abdominal segments 



subchela 



subdivided carpus 



telson 



Figi're 2. — Schematic drawing of shrimp in lateral view; ai., appendix interna; a.s., antennal spine; 

 a. sc, antennal scale; b., basis; b.s., branchiostegal spine; cp., carpus; ex., coxa; d., dactyl; 

 end., endopod ; ep„ epipod ; ex., exopod ; h.s., hepatic spine: i.. ischium; m.. merus: p.. pro- 

 podus ; p.g., postorbital groove; p.s., pterygostomian spine; s.s., supraorbital spine; St., styloce- 

 rite. (Modified after Holthuis, 1955 ; Schmitt, 1921.) 



Frontal teeth. — True frontal teeth; those teeth 

 originating on the front but exclusive of the inner 

 orbital teeth. 



Gastric region. — Large median area, in the crab 

 carapace, bounded behind by the cervical suture, 

 laterally by the hepatic regions, and anteriorly by 

 the frontoorbital regions. It is divisible into the 

 following subregions or lobes: epigastric, proto- 

 gastric, mesogastric, metagastric, and urogastric. 



Genital region. — See urogastric lobe. 



Hand (chela). — Propodus and dactyl of the 

 cheliped. 



Hepatic region. — A small (paired) subtriangu- 

 lar, anterolateral region, wedged between bran- 

 chial and gastric regions, and either margin of 

 carapace or margin of orbit in Brachyura. 



Hepatic spine. — Spine on hepatic region in 

 Natania (fig. 2). 



Ischium (ischiopodite). — Fifth article of a leg 

 or maxilliped from the distal end. It is usually the 

 first large article of the maxilliped. 



Merus (meropodite). — Fourth article from the 

 distal end of a leg or maxilliped. It is sometimes 

 called the arm of a cheliped. 



Mesogastric lobe. — Lobe or subregion which is 

 the median division of the gastric region, pen- 

 tagonal in form, and with a long, narrow, anterior 

 prolongation. 



Metabranchial (metabranchial region). — That 

 region of the porcellanid (crab) carapace which is 

 situated below the linea anomurica and, therefore, 

 not completely united with the main portion of 

 the carapace. 



Metagastric lobe. — Posterolateral lobe or sub- 

 region of the gastric region; often not defined. 



Ocellus. — Little eye, distinct from the main 

 organ of vision. 



Orbit. — Cavity in the carapace containing the 

 eye. 



Orbital region. — Narrow space bordering upper 

 margin of orbit ; not always distinguishable. 



Palate. — Roof of buccal cavity in crabs. 



Palm. — Proximal portion of propodus of chela. 



Petasma. — Endopodite of the first pleopods in 

 male Penaeidae. It takes the form of a compli- 

 cated membranous plate bearing coupling hooks 

 medially which interlock with the member of the 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



9 



