324 Surg.-Capt. A. Alcock on 



have each two irregular rows of spines on the inner face, the 

 propodite also having two or three spines on the outer aspect ; 

 the fingers are about two thirds the length of the palm and 

 are finely toothed, the immobile finger having a second 

 series of 5 or 6 large teeth and ending in a pair of claw-like 

 spines, between which the tip of the dactylus shuts. 



Of the second, third, and fourth thoracic legs the merus 

 has both edges spiny, the anterior the more markedly so ; the 

 carpus has the anterior edge spiny, the posterior edge having 

 only a single terminal spine ; the propodite has the posterior 

 edge distantly spinulate ; and the dactylus has the anterior 

 edge crenulate. 



The first abdominal appendages are absent in the male. 



Colour in life dull red. 



Dredged at Station 115, 188-220 fath. 



The largest male measures 42 millim. and the largest 

 female 41 millim. from the tip of the rostrum to the end of 

 the telson. 



The spermatozoa of this form, wdiich I have had an oppor- 

 tunity of examining in a specimen lately sent from the 

 * Investigator,' are remarkable for their size, but still more 

 for their form. As teased out from a piece of the sperm-tube 

 they consist of an elongate oval head which gradually tapers 

 to a long lash-like tail. They have, in fact, much the 

 appearance of flagellate spermatozoa of gigantic size, only the 

 end of the flagellum is truncated and split into two little lips, 

 and the head is connected at its front end by means of a short 

 twisted filament with a sucker-like plate. In structure the 

 head and the tail throughout its whole extent are alike, con- 

 sisting of a granular core, which stains deeply with carmine, 

 and an outer clear structureless envelope, which remains 

 unstained. 



77. Munida trtcarinataj sp. n. 



Belonging to the group Munida granidata, scabra, and 

 proxima^ Henderson, and 3hinida obesa, Faxon. 



The length of the carapace and the greatest breadth are 

 equal. The entire carapace is covered with spinclets arranged 

 in longitudinal and transverse rows. The rostrum is less 

 than one fourth the length of the rest of the carapace and not 

 very much longer tlian the supraorbital spines ; it is con- 

 tinued backwards to the after border of the carapace, first as 

 a sharply spinulate carination of the front half of the gastric 

 region, then as a row of 3 close-set spines traversing the 

 posterior half of the gastric region, then as a row of 3 more 

 distant spines traversing the cai'diac region, and terminates 



