27 



trichobranchiae. The gills are in fact phyllobranchiate at 

 the base and trichobranchiate above. As the filaments 

 become shorter and less crowded towards the apex of the 

 gill, they are also less flattened. 



Ortmann in 1892 proposes to refer Parapagurus, the typical 

 genus, to the Paguridae, allotting Pylocheles and Chiroplatea 

 to the Parapaguridae. But in such a classification it is 

 obvious that t.he name Parapaguridae would need to be 

 changed. 



Gen. : Parapagurus, S. I. Smith. 



1 879. Parapagurus, Smith, Trans. Connecticut Academy, v. 5, 

 pt. I, p. 50. 



1882. P'«r(^/rt^//;'/^5, Smith, Bull. Mus. Comp. Zool., Harvard, 

 V. 10, No. I, p. 20. 



1888. Parapagurus, Henderson, Challenger Anomura, Re- 

 ports, V. 27, p. 85. 



1893. Parapagurus, A. Milne-Edwards and Bouvier, Mem. 

 Mus. Comp. Zool., Harvard, v. 14, No. 3, Paguriens, 

 p. 26. 



1893. Parapagtcncs, Stebbing, History of Crustacea, p. 166. 



Rostrum inconspicous, pleon spiral. Ocular peduncles not 

 very long, the scales wide apart. Plrst antennae, third joint 

 of peduncle elongate, reaching much beyond the eyes. 

 Third maxillipeds wide apart at the base. Right cheliped 

 the larger. Second and third legs little distant at their 

 bases, elongate, with long curved fingers. Female with the 

 sexual orifice only on the left limb of the third pair. Fourth 

 legs imperfectly chelate, fifth minutely chelate or sub-chelate. 

 First and second pleopods, in the male, pairs, uniramous, 

 sexual ; in the female, first wanting, second biramous, on the 

 right side wanting. Third, fout'th, and fifth pleopods, on the 

 right side wanting, on the left biramous, but one ramus 

 rudimentary in all in the male, in the fifth pair in the female. 



The branchiae are stated by Professor Smith to be eleven 

 pairs, two each to the third maxillipeds and first three pairs 

 of legs, the remaining three belonging to the fourth pair of 

 Irigs. Professors Milne-Edwards and Bouvier found a 

 rudiment of a flagellum on the palp of the first maxillae, but 

 no vestige of one on the palp of the first maxillipeds. In 

 P.dimorphus I can find no rudiment of such a flagellum in 

 either of these appendages. They say in their description of 

 the genus that the peduncle of the second antennae is longer 

 than the carapace, but this is quite at variance with the 

 measurements ot P.dimorphus as well as with those given by 

 vS. I. Smith for P.piloswianus, with which the French authors 

 are also dealing. 



