151 



maxillipeds the ruanducant functions are more or less sub- 

 ordinate to the respiratory : — 



i. Sternum not broad : carapace either depressed or 

 globose^ The antennal peduncle consists of five 

 movable joints, and an antennal scale is present. 

 The 2nd and 3rd maxillipeds have no exopodites. 

 At least the first 4 pairs of thoracic legs are chelate, 

 the 1st pair being much larger and longer than the 

 others. The telson is acute. The 1st abdominal 

 somite has a pair of uniramous appendages. [Eryoni- 

 dea] ... ... 



ii. Sternum broad. The basal joint of the antennal pedun- 

 cle is merged in the epistome, and no antennal 

 scale is present. All the maxillipeds have exopodites. 

 None of the thoracic legs are particularly enlarged, 

 and none, except sometimes the last pair in the 

 female, are chelate. The telson is subquadrangular 

 and is coriaceous in its posterior half. The 1st 

 abdominal somite is destitute of appendages. 

 [Loricata] : — 



a. Carapace subcylindrical (occasionally cuboid- 



al) : the eyes are not enclosed in orbits: 

 the antenual flagellum is a long lash 



b. Carapace strongly depressed: the eyes are 



enclosed in orbits: the antennas are broadly 

 lamellar 



ErTONIDjE. 



PALINURID.E. 



Sctllaridj:. 



II. The last segment of the narrow thoracic sternum is movable and 

 independent : the abdominal terga overlap one another hardly or not 

 at all. [The rostrum is small and triangular, or rudimentary. The 

 carapace is not fused with the epistome or in any way overlapped by 

 the 1st abdominal tergum. The antennal peduncle consists of five 

 movable joints and supports a lash-like flagellum. The telson is 

 usually subquadrangular, and the 1st abdominal somite usually 

 carries a pair of uniramous appendages. Thalassinidea] : — 



1. The abdominal pleura behind the 1st are well developed. The 



antennular flagella are much longer than their peduncle : a 

 spiniform antennal scale is often present : the maxillipeds 

 and the first 4 pairs of thoracic legs have foliaceous epipodites AxilDa;. 



2. The abdominal pleura are rudimentary or absent. The anten- 



nular flagella are little or not at all longer than their 

 peduncle. No antennal scale. No epipodites behind the 1st 

 maxillipeds ... ... ... ... ... Caujanassids. 



Family Nephropsulce, Stebbing. 



Stebbing, Hist. Crast., p. 201 : Ortmann, in Bronn's Thier Reich, Malacostraca, p. 1139. 

 Eomaridn', Spence Bate, Challenger Crust. Maernra, p. 170. 



Cephalothorax subcylindrical, the carapace produced anteriorly to a stout 

 rostrum, and overlapping the 1st abdominal somite posteriorly. The abdominal 



