1921 ] Schmitt: The Marine Decapod Crustacea of California 105 



Tribe PALINURA 



Key to the Superfashlies and Families of the Palinura 



I. All of the legs chelate, except sometimes the last pair ; the first larger than the 



rest. First joint of antennae not fused with the epistome; an antennal 



scale present. Pleopods present on first abdominal somite; tail-fan not 



softer behind than before, without sutures; telson pointed (Superfamily 



Eryonidea). 



Eryontidae, p. 105. 



II. None of the legs chelate, except sometimes the first pair; none much longer 

 than the rest. First joint of antennae fused with the epistome; no 

 antennal scale present. Pleopods absent from first abdominal somite: 

 tail-fan divided by indistinct sutures into a soft hinder part and a 

 harder front half; telson roughly square behind (Superfamily Scyllari- 

 dea). 



A. Carapace subcylindrical. Eyes not enclosed in separate orbits formed 



by the edge of the carapace. Antennae with flagella. 



Palinuridae, p. 107. 



B. Carapace depressed. Eyes enclosed in separate orbits formed by the 



edge of the carapace. Antennae with flat scales in place of flagella. 



(Not found off California.) 



Scyllaridac. 



Family Eryontidae 



Carapace either depressed with very sharply defined lateral borders or sub- 

 globose; rostrum wanting, or represented by a small spine or pair of spines. 

 Eyes rudimentary and eye-stalks immovably fixed in the orbital notches of the 

 anterior margin of the carapace. Antennal peduncle five-jointed, basal joint not 

 fused with the epistome; flagellum lash-like; the renal tubercle of the basal joint 

 of the peduncle is remarkably prominent. Telson pointed. 



Genus Eryonicus Bate 



Carapace subglobose, much inflated, and larger than the abdomen; integument 

 almost membranous. Antennules and antennae shorter than the carapace ; renal 

 tubercle on basal segment of antennae nearly equaling the peduncle in length. 



Eryonicus agassizi Bouvier 



Plate 15, figures 1 and 2 



Eryonicus caecus? Faxon, Bull. Mus. Comp. Zool., 24, 197, 1893; Mem. 

 Mus. Comp. Zool., 18, 110, pL B, fig. 2, pi. xxix, figs. 2-2/, pi. xxx, 1895 

 (not Eryonicus caecus Bate); Selbie, Sci. Invest. Fisheries Ireland, 

 1, 26, 1914; Sund, Nature, 95, 372, 1915. 

 Eryonicus Agassizi Bouvier, Bull. Inst. Oceanog. Monaco, 309, 2, 1915. 



Characters. — Bostrum represented by a pair of small spinules. Median ridge 

 of carapace armed with small spines, arranged as follows: Rostrum + lj 2, 1, 1, or 



