( 7'.. ) 



Malacostraca, p. 1146; Milne Edwards and Bouvier, Mem. Mus. Comp. Zoo'. Harvard, XiV 

 No. 3, JS93, p. 161 : Stebbing, Hist. Crust. 1S93, p. 160: Young, Stalk-eyed Crust. W. Indies 

 1900, p. 364. 



L'ardanus. Paulson, Mary Rathbun, Proc. U. S. Nat. Mus. 1903, p. 33. 

 Pagunas, J. E. Benedict, Bull. U. S. Fish. Comm. XX. 2, for 1900, p. 141. 



Carapace usually but not always elongate, broadened posteriorly, strongly 

 calcified in front of the cervical groove and in the neighbf)urhood of the 

 cardiac region. Rostrum absent, ophthalmic somite exposed. 



Abdomen well developed, spirally coiled, soft, with the terga widely 

 separated. 



Eyestalks stout; ophthalmic scales large and widely separated. An- 

 tennal acicle well formed : the flagellum long and non-setose. 



External maxiUipeds approximated at base : the exopodites of all three 

 pairs of maxiUipeds have a well-develcped fiagellum : the endopodite (palp) 

 of the 1st maxillfe non-flagellate. 



With few exceptions the chelipeds are dissimilar and unequal, the left 

 being greatly the larger : the finger tips are corneous, and (especially those of 

 the smaller cheliped) som.ewhat spooned : the fingers open and close in an 

 obliquely-vertical plane. 



The fourth pair of legs are subchelate, and the fifth pair chelate : in 

 both, on the outer surface, near the tip, there is a patch of imbricating 

 corneous granules — as there is also on both rami of the tail-fan. 



The abdominal appendages, in addition to those that form the tail-fan, 

 are 4 in number (on somites 2 — 5) and are placed on the left side : in the 

 male they are small and uniramous — the posterior ramus being a mere 

 papilla : \n the female the first three are large and triramous, and the fourth is 

 small and resembles that of the male. In both sexes there is commonly 

 found, behind the third abdominal appendage, but more ventral in position, 

 a setose fleshy or partly calcified spur. The telson, and other parts of 

 the tail-fan are more developed on the left side than on the right. 



The branchiae are phyllobranchije, and are 14 in number on either side, 

 arranged as in Pylocheles. 



The genus Pagurus, as restricted, is characteristic of the tropical 

 littoral of the eastern hemisphere. The majority of Fai;uri are found in the 

 Indo-Pacific, between the parallels of 25°N. and 2o°S , and the meridians 

 of 40°E. and I40°W., one species {P. simstripes), however, occurring at 

 Panama. Outside this area the genus is represented, but poorly, in the West 

 Indian region, and in the Mediterranean and its approaches, from Setubal to 

 Senegambia, — one of the species found here (/'. ariosor) having a most 



