75 



ACAXTHEPHYRA, A. M. Edw. 



Acanthephyra, A. Milne Edwards, Ann. Sci. Nat.. Zool., (6) XI. 1881, Art. 4, p. 12: S. I. Smith, Albatross 

 Crast. in Kep. U.S. Fish Comm, fcr 1882 ilSS-t', p. 372 : Spence Bate, Challenger Cruat. Macrura, p. 780: Faxon, 

 Mem. Mna. Comp Zool. XVIII. 18'.'5, p. ICO. 



Body compressed. Rostrum usually long and armed with teeth both 

 dorsally and ventrally, rarely short. Carapace smooth, without any special 

 mode of articulation with the abdomen : a post-antennular and post-antennal 

 spine are present, in addition to the blunt orbital angle. 



Abdomen more or less carinated, the carinas of some of the terga ending 

 posteriorly in a tooth or spine. Abdominal pleura deep and wide. Telson acute. 



Byes variable in size : a small " ocellus " sometimes present. 



Antennular peduncle short : the 1st joint dorsally concave for the eye, and 

 having a small " scale " at the base of its outer margin : two antennular 

 flagella, of good length, the outer one thickened at base. Antennal scale long 

 and narrow, the outer edge smooth and ending in a little spine : a spine of 

 ordinary form exists at the far end of the outer border of the 2nd joint of the 

 antennal peduncle. 



Exopodite of 1st maxillipeds broadly foliaceous : those of all the other 

 thoracic appendages have the ordinary lashlike form. 



The terminal segment of the 2nd maxillipeds sits so obliquely against the 

 inner border of the propodite as to appear like a complemental piece of the 

 latter segment. 



External maxillipeds stout, pediform, the second segment fbasis-ischium- 

 merus) arched outwards. 



The thoracic and abdominal legs are as in Hoplophorus. 



The eggs, as far as is known, are small and numerous. 



The branchial formula is exactly the same as that of Hoplophorus, except 

 for the absence of a rudimentary epipodite from the penultimate pair of thoracic 

 legs, and is as follows : — 



Somites and Podobranchiae. Arthrobranchise. Pleurobranchise. 



appendages. 



VII (ep.) 



VIII I (ep.) 



IX (ep.) • 2 



X (ep.) 1 



XI (ep.) 1 



XII (ep-' * 



XIII 1 



XIV o 



Total 1 + 6 ep. 6 5 =12 + 6 ep. 



