housing). Eye scales triangular. Thoracic 

 sternites, corresponding to third, fourth, and fifth 

 legs, free and mobile. Legs four and five reduced 

 and modified. Middle terga of abdomen separated 

 more or less by membrane (adapted from Alcock, 

 1905 ;Bouvier, 1940). 



Remarks. — A most useful bibliography of this 

 group was published by (Jordan (1956). The 

 family Paguridae has a long fossil record in 

 North America. Species of Paguristes, Petro- 

 chirus, and Pagurus are known from the Creta- 

 ceous, and Dardanus from the Eocene (Rathbun, 

 1935). 



KEY TO SUBFAMILIES IN THE CAROLINAS 



a. Third maxillipeds approximated at base ; ehelipeds 

 subequal, or left much larger than right, rarely with 

 right slightly larger than left Diogeninae (p. 115). 



aa. Third maxillipeds widely separated at base by a 

 sternum ; right eheliped usually much larger than left, 

 left never larger than right, occasionally subequal 



Pagurinae (p. 125). 



Subfamily Diogeninae 



The chief distinguishing characters are given in 

 the above key. 



KEY TO GENERA AND SOME SPECIES OF 

 DIOGENINAE IN THE CAROLINAS 



a. Paired appendages present on first two abdominal seg- 

 ments of male, and first abdominal segment of female ; 

 fingers of ehelipeds opening and closing horizontally 



Pagnristes (p. 115). 

 aa. No paired appendages on anterior abdominal seg- 

 ments in either sex. 



b. Fingers of ehelipeds opening and closing horizon- 

 tally Clibanarius rittatus (p. 120). 



bb. Fingers of ehelipeds opening and closing obliquely 

 or nearly vertically. 



c. Chelipeds not markedly unequal, right usually 

 slightly larger than left 



Petrochirus diogenes (p. 122). 



cc. Chelipeds markedly unequal, left much larger 



than right Dardanus (p. 123). 



Genus Paguristes Dana, 1852 



Provenzano, 1959, p. 381 (rev.). 



KEY TO SPECIES IN THE CAROLINAS 



a. Rostrum broadly rounded, or pointed, but not advanced 

 beyond level of lateral projections on front, 

 b. Anterolateral sides of anterior shield of carapace 



not spiny moorei (p. 115). 



bb. Anterolateral sides of anterior shield of carapace 



definitely spiny lymani (p. 116). 



aa. Rostrum slender, and definitely advanced beyond 

 level of lateral projections on front, 

 b. Anterior shield of carapace not noticeably longer 

 than broad, 

 c. Frontal and lateral margins meeting at almost a 



right angle sericeus (p. 117). 



cc. Frontal and lateral margins meeting at broadly 



obtuse or rounded angle triangiilatus (p. 118). 



bb. Anterior shield of carapace noticeably longer than 

 broad. 



c. Eye scales acuminate spinipes (p. 118). 



cc. Eye scales with three or four (occasionally two) 

 terminal spines tortugae (p. 119). 



Paguristes moorei Benedict 



Figure 91 



Paguriatea moorei Benedict, 1901, p. 144, pi. 4, fig. 3. — Hay 

 and Shore, 1918, p. 409, pi. 30, fig. 3. 



Recognition characters. — (Taken from holo- 

 typic female.) Anterior shield of carapace 

 slightly longer than broad ; upper surface of cara- 

 pace with a few scattered hairs and irregular 

 punctations, more or less iridescent. Rostrum 

 short, obtusely pointed, slightly less advanced 

 than more acute lateral projections. Eyestalks 

 slender, slightly dilated distally, slightly longer 



Figure 91. — Paguristes moorei Benedict. Type 

 female, anterior part of body in dorsal view, 

 approximately X 5 (after Benedict, 1901). 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



115 



