SUPER-ORDER I 



I'HVLLOPODA 





striae. The latter character serves to di.-tingui-li thi- p-nu- I'mm /' 



(p. 371). The beaks are not sharply defined, and tin- primitive portioot tOOMtiJllflB 



bear a strong ocular or muscular iiMe. 



This genus li;is iiuim-mus t,'.->il representatives, being firxt met with in : 

 i,m, and occurring 

 mostly in brackish 

 and shore deposits. 

 It abounds in the 

 productive Coal 

 Measures, in the 

 Permian,Trias (Let- 

 tenkohlen rn e rgel), 

 and \Vealden, and 

 has been found in A ,.... T .^.~- T^ r,^ ... . D ^ 



Fio. 1334. 



A, L>'> /../,/;. Jones. Coal Measures ; Pott- 



the Pleistocene ville, Pennsylvania. B, L. Baentschiana, Geinitz. Srhteodimu capta, Clarke. 



Coal Measures; Neunkirchen, near, Saarbritcken Hamilton; Centrfiel<i 



(after Goldenberg). York. a/,. 



Clays of Canada. 



Leaia, Jones 



(Fig. 1334). Carapace marked by one or two diagonal ridges which run from, the 

 anterior end of the dorsal margin toward the, lower margin. Carboniferous ; Europe 

 and North America, 



Estheriella, Weiss. Carapace as in Estheria, but with radial riblets crossing the 

 concentric striae. Permian ; Eussia. Buntersandstein ; Saxony. 



Schizodiscus, Clarke (Fig. 1335). Carapace peltate, with a straight hinge which i- 

 in the major axis of the shield. Each valve nearly a semicircle ; 

 surface marked with concentric ridges. Middle Devonian ; 

 New York. 



Family 2. Apodidae. Burmeister. 



Eyes sessile and head with a large shield -like carapace 

 extending over the thoracic segments; antennulae large and 

 triflagellate ; antennae greatly reduced except in the /////. 

 Thorax with thirty to forty pairs of foliaceous feet ; segmented 

 abdomen without appendages save a pair of caudal fibum nf.<. 



Protocaris, Walcott (Fig. 1336). The oldest representative 

 of the ^ms-type, and exhibits a remarkable similarity to Apus 

 in its univalve carapace, multi-segmented abdomen, and single 

 pair of caudal spines. Lower Cambrian ; Vermont. 



Apus, Schaff. (Lepidurus, Leach). Characters of the family. Trias to Recent. 



Fio. 1336. 



Protocaris Marshi, Wal- 

 cott. Cambrian ; Georgia, 

 Vermont. 2/ 3 . 



Family 3. Branchiopodidae. Baird. 



Head distinct, eyes stalked ; carapace wanting. Thorax with eleven to nineteen pairt 

 of foliaceous feet ; abdomen terminating in two caudal processes. 



Branchipodites, Woodward. Similar to the recent Branchipus. Oligocene of Bern- 

 bridge, Isle of Wight. (B. vectensis, Woodw.) 



Anomalocaris, Whiteaves. This name has been applied to bodies from the 

 Cambrian of British Columbia which resemble the segmented abdomen of a Bram-hiu- 

 pod, each segment bearing a pair of lamellate appendages. Although tin- ol'jirt.- 

 abound where found, nothing is known of the carapace, nor is there any evidence of 

 the surface markings which characterise most Crustacean shields. Its affinities are 

 doubtful. 



VOL. 



2 T 



