153 



Nephkops, Leach. 



Wephrops, Lead,, Malac. Pod. Brit, text preceding pi. xxxvi : Milne Edwards, Hist. Nat. Crnst. II. 335: 

 Spence Bute. Chiillenicer Crust. Macrura, p. 184. 



Rostrum of good length, depressed at least in its proximal half, armed with 

 teeth. Carapace (without rostrum) more than half the length of the abdomen, 

 divided into two portions by a very broad and deep cervical groove, usually 

 sculptured with longitudinal ridges. Telson almost square, about as long as the 

 caudal swimmerets, the outer of which is transverselv fissured. 



Eyes very large, reniform, deeply pigmented. The basal joint of the anten- 

 nular peduncle is as long as the 2nd and 3rd joints combined, and has no 

 " stylocerite " : the antennular flagella are shorter than the carapace proper, the 

 outer being slightly shorter and stouter than the inner. Antennal scale foliaceous, 

 of moderate length, not concealing the terminal joint of the antennal peduncle. 



1st pair of thoracic legs chelate, longer and vastly stouter than any of the 

 others, but little unequal in the male, their joints prismatic. 2nd-5th legs sub- 

 cylindrical, comparatively slender, the 2nd and 3rd chelate. 



The abdominal appendages from the 2nd to the 5th have short foliaceous 

 rami. The modified 1st pair of the male are pointed and scoop-shaped, the 

 anterior lip of the scoop having at its far end a roughened facet for making fast 

 when these appendages are apposed. The male appendix of the endopodite of 

 the 2nd pair of appendages is short, spatulate and ecurvate. 



The branchial formula is as follows : — 



Somites and 



Appendages. Podobranchiw. Artlirobianchise. Pleurobranchise. 



VII (ep.) () 



VIII 1 (ep.) o 



IX 1 (ep.) 2 o 



X 1 (ep.) 2 o 



XI 1 (ep.) 2 i 



XII 1 (ep.) 2 J 



XIII I (ep.) 2 i 



XIV o 



ep 



= I+ep 



= 3+ep 



= 3 + ep 



= 4 + ep 



= 4 + ep 



= 4 + ep, 



1 = 1 



Total 6+7 ep. 10 4 



20 + 7 ep. 



The podobranch of the 2nd maxillipeds is small but well plumed. 

 89. NephrOpS thomsorii, Spence Bate. 



Nephrops thomsoni, Spence Bate, Challenger Crust. Maorura, p. IS.",. p | x „. txvi . Ortmam. Zool Jahrh 

 Syst Ac, X. 1897-9S, p. 273. ' J »n»>., 



Nephrons thomsoni var. andamanica, Wood-Mason. 



Nephrops andamanica Wood-Mason, Alcook, Ann. Mag. Nat. Hist., March 1894, p. 226: Ortmann loe cit 



ILLUSTRATIONS OF THB ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA PLATE IV. PlG. 1 AND VIII FlG 5 



The rostrum, which reaches beyond the antennal peduncles and is about 

 20 



