185 

 The branchial formula is as follows : — 



Total 6 + 7 ep. 11 4 = 21+7 ep. 



108. Panulirus angulatus, Spence Bate. 



Panulirus angulatus, Spence Bate, Challenger Crust. Macrura, p. 81, pi. xi., figs. 2, 3, 4 (young) : Alcock and 

 Anderson, Journ. Asiatic Soc. Bengal, Vol. LXIII., 1894, pt. 2, p. 166. 



Carapace elongate-cuboidal, its sidewalls being perpendicular, half a telson- 

 length shorter than the abdomen : its well-defined lateral margins are cut into 

 3 large teeth (which decrease in size in posterior succession) in front of the 

 cervical groove, and are serrated behind it, the serrations being acute in the 

 young, but worn and blunt in the adult : its infraorbital spine is large and has 

 a small spine below and anterior to it and 2 or 3 behind it : on the gastric region 

 are two anteriorly-convergent longitudinal rows of spines (young) or tubercles 

 (adult) : behind the cervical groove is a median longitudinal carina, which is 

 strongly spinose in the young, and crenulate or merely eroded in the adult. The 

 whole surface of the carapace behind the cervical groove is studded with miliary 

 tubercles, which on the sidewalls are arranged in regularly radiating series. 



The abdominal terga are carinated, the carina of the 6th tergum being 

 double : in the young the carinas are serrated, one of the spines in each carina 

 being much enlarged, but in the adult the serrations become smooth tubercles. 

 Each tergum, from the 2nd to the 5th, has at either pleural end an oblique patch 

 of sharp vesiculous tubercles (young) or elevations (adult), as well as a few 

 small tubercles on either side of the carina. The pleura, from the 2nd to the 

 5th, are traversed obliquely by a row of teeth (young) or blunt tubercles (adult) 

 and end in a pair of spines (young) or teeth (adult j : the 6th pleuron ends in a 

 single spine or tooth. 



The last six thoracic sterna carry a median spine (young) or tubercle 

 (adult), and the last five have one or two spines (young) or teeth (adult) on their 

 raised lateral margins. The 1st abdominal sternum has a transverse row of 

 4 spines, the 2nd-5th have each a pair of median spines, and the 6th has two 

 transverse rows of spines, these all being very distinct in the youno-, but in- 

 conspicuous in the adult. 



24 



