Narrative of Bahama Expedition. 157' 



group, but one would think that the formidable spines would 

 render concealment rather a superfluous protection from most 

 of its enemies. Three species of JMithrax were secured from 

 comparatively shallow water. Indeed this genus is not repre- 

 sented in our collections from deep water. 



The family Parthinopid.^ is represented in the West 

 Indies by numerous species of Laiiibnis and its allies, most of 

 which are characterized b}^ peculiarly shaped chelipeds, the 

 hand being trigonal and greatly elongated, and the fingers 

 very short. The old genus Lainhnis has been divided by 

 Milne Edwards into at least ten genera. Plafylaiiibnis scr- 

 ratiis (M. E.) was found in shallow water both here and at the 

 Tortugas, while Laiiibriis fourtalesia Stm. was found in 

 abundance on the Pourtales Plateau proper, and also in deep 

 water off Havana, being one of the few species secured on 

 both sides of the Gulf Stream from deep water. Lambnis 

 agonus Stimp. has very long and slender chelipeds, and is- 

 one of the numerous species secured by Count Pourtales 

 during his memorable explorations of the Gulf Stream. The 

 same is true of Lanibriis fratcrcnlus Stimp., with shorter chel- 

 ipeds and a carapace longer than'^ broad. The genus Solcii- 

 olaDibnis was separated from Lcunbnis on account of its 

 smooth, polished carapace and other more technical charac- 

 ters. Our specimen of Solcuolanibnis typiciis Stimp. differs 

 from all the other Maioids in the collection in being colored a 

 bright blue, this color covering the whole of the body and 

 appendages, with the exception of paits of the chelipeds.. 

 The hand has ten very regular and conspicuous scallops on 

 the upper edge, and the edges of all joints of the chelipeds- 

 are beautifully crenulated. It came from a depth of about 

 fifty fathoms. In the original description of this species, the 

 color is not given. If our specimen is normal, we have here 

 a very unusual coloration for a comparatively deep-water 

 Crustacean, (this species having been taken in depths of from 

 fifty to two hundred and forty-eight fathoms.) Almost all the 

 other Crustacea secured by us from a greater depth than 

 twentv fathoms were either lackini*" in bri^rht color or were a. 



