REPORT ON THE ANOMURA. 85 



the ambulatory limbs are less strongly curved, and without black horny tips, while the 

 apex of the telson is rounded. 



Habitat. — Station 163a, off Twofold Bay, Australia; depth, 120 fathoms; bottom, 

 green mud. 



FIBRIBRANCHIATA. 



Family PARAPAGURIDiE. 

 Farapaguridx, S. I. Smith, " Blake " Crust., Bull. Mus. Comp. Zool., vol. x. p. 20, 1883. 



Antennular peduncle elongated or of moderate size, the first joint short and stout, the 

 second and third joints slender and cylindrical ; both flagella of small size. Anteunal 

 peduncle subcylindrical. Species marine and confined to deep water. 



With the exception of the important difi'erenee in the structure of the branchiae,^ and 

 the fact that the species appear to occur only in deep water, the general characters of this 

 family kre those of the Paguridse. 



Genus Parapagurus, S. I. Smith. 



Parapagurus, S. I. Smith, Trans. Cunuect. Acad., vol. v. p. 50, 1879 ; " Blake " Crust., Bull 

 Mus. Comp. Zool., vol. x. p. 20, 1883. 



Front with the rostral projection but slightly marked. Ocular peduncles usually 

 slender ; the ophthalmic scales spinular and of small size, separated by a considerable 

 interval. Antennules long. Antennal acicle well developed ; the flagellum longer than 

 the body, and usually naked. Chelipedes markedly unequal, the right larger ; fingers 

 moving in an ol:)lique plane and calcareous or but slightly corneous at the tips. Ambula- 

 tory limbs with long and slightly tortuous dactyli ; the penultimate pair of legs 

 subchelate. Abdominal segments with fairly well developed terga ; the male with the 

 first two segments bearing each a pair of appendages, in the female the second is 

 biramous and represented only on the left side, while the first pair are absent ; 

 in both sexes the third, fourth, and fifth segments are provided with a biramous 

 appendage on the left side, one of the rami being rudimentary in all the male 

 appendages, and in that of the fifth segment in the female. 



AU the females of this genus which I have had the o]3portunity of examining, possess 

 the remarkable peculiarity of having an external genital opening present only on 

 the coxa of the third left leg ; but owing to the very imperfect state of preservation of 



1 In all, the gUls are modified trichobranchise, each consisting of a central stem which gives rise to two collateral 

 rows of rounded filaments, gradually decreasing in size towards the apex, whereas in the Paguridae the stem gives rise to 

 two rows of flattened leaflets. 



