654 



ARTHKOPODA 



SUB-KIXGDOM VII 



these are compared by Woodward with the gastric teeth of the lobster 

 (Fig. 1369). 



Sub-Order A. NEBALIINA. Clarke. 



Carapace folded, univalved, and rostrate. 



Family 1. Nebaliidae. Baird. 



Cephalic appendages Jive, thoracic eight, abdominal eight, terminating in two caudal 

 spines. No metamorphosis ; development direct. 



Fi<;. 1369. 



Gastric teeth of Echinocaris 

 punctata, Hall. Hamilton; 

 Pratt's Falls, New York. 1/1- 



FIG. 1370. 

 Nebalia Geoffroyi, M. Edw. Recent ; Mediterranean. 



Nebalia, Leach (Fig. 1370). Represented by a few species inhabiting shallow 

 waters of northern seas. Paranebalia and Nebaliopsis are also Recent and marine. 



Sub-Order B. HYMENOCARINA. Clarke. 



Nebalia-like forms with folded univalved carapace; rostrum wanting (?). 



Body 



Family 1. Hymenocaridae. Salter. 



with eight to nine thoracic and abdominal segments, and six caudal spines in 

 three pairs. 



Hymenocaris, Salter (Fig. 1371). Carapace narrow 

 in front, very broad posteriorly, convex ; surface smooth 

 or faintly lined. Cambrian ; Wales. 



Jflibeiria, Sharpe. Arched, univalved bodies with 

 strong beaks, muscular scars and sub -cardinal ridge. 

 These fossils have been referred to the Phyllocarida, 

 Pelecypoda, and Gastropoda. There is no satisfactory 

 evidence of their Crustacean nature.] 



Sub-Order C. CERATIOCARINA. Clarke. 



', Wales! Carapace bivalved, with a median symphysis and a 



free rostrum. 



Family 1. Ceratiocaridae. Salter. 

 Carapace pod-shaped, smooth, and without eye-nodes. 



Ceratiocaris, M'Coy (Entomocaris, Whitf.), (Fig. 1372). Valves of carapace elongate, 

 sub-ovate, or sub-quadrate, narrow in front, sub-truncate, but not incurved behind. 





