MUSEUM OF COMPARATIVE ZOOLOGY. 181 



typical form. This variety may be called Galacantha diomedem parvispina. At 

 one station (3429) both forms were obtained at the same haul. 



This species differs from G. rostrata, areolata, sjnnosa, and lalismanii in the 

 rugose nature of the sculpture of the hinder half of the carapace. In the 

 relative proportion of the anterior and posterior lateral spines it agrees with 

 G. spinosa. 



1 female juv. 



3 males, 3 females ovig. 



1 female. 



3 males, 1 female ovig. 



5 males, 2 females (1 ovig.). 



1 male. 

 3 males. 



2 males, 1 female, 

 1 male. 



1 male. 



1 female ovig. 



1 male. 



1 male. 



18 males, 17 females (6 ovig.). 



6 males, 4 females (3 ovig.). 



In both G. rostrata and G. dioviedece there is a curious sexual difference. In 

 the male the proximal half of the telson is furnished on each side with long 

 amber-colored setae, which are entirely wanting in the female. The same 

 difference between the sexes is found in some species of Munidopsis. 



G. diomedece is often infested with parasites. One of the males from Station 

 3371 bears a Peltogaster, while seven specimens (5 males, 2 females) of var. 

 parvispina house a Bopyrus in the left branchial chamber. 



The eggs of this species measure 3 X 2.5 mm. 



Munidopsis ^ vicina, sp. nor. 



Near M. ciliata AVood- Mason, from which it differs as follows. Tt is a very 

 much smaller species, the adult ovigerous female being only twenty-nine milli- 

 meters long ; the anterior margin of the propodus of the ambulatory appen- 

 dages bears two very prominent spines. The telson lacks the pair of long and 

 narrow plates which lie on each side of the small central plate in M. ciliata. 

 As in M. ciliata, the carapace is covered with squamous tubercles, the rostrum 

 is curved slightly upward, and the chela is short. 



Length, 29 mm. ; breadth, 9.5 mm. 



Station 3360. 1672 fathoms. 1 female. 

 " 3382. 1793 " 1 female ovig. 



1 The genus Munidopsis, as here understood, includes Gnlalodes, Orophorrhynchus, 

 and Elasmonotus of A. Milne Edwards, and Anoplonotus of Smith. 



