74 On a neio Species of Sessile-eyed Crustaxiean. 



seems scarcely distinguishable from tlie corresponding limbs 

 of J/. Wehsteri : the general proportions are the same ; and the 

 wrist and hand are in like manner densely clothed with long 

 hairs on the anterior margin, while tufts project from the 

 other side. Close to the extremity of the palm is a slender 

 spine, which the finger, when in a clasping position, overlaps. 

 The first gnathopods exceed the second in size, but to no very 

 great extent ; they agree with the second in hirsute adornment, 

 with, however, this addition, that the hinder part of the meta- 

 carpus is here clothed like the front of the wrist and hand. 

 The wrist is rather longer than the hand, but scarcely so wide. 

 The palm of the hand is quite unlike that of any of the other 

 hitherto described species of Microdeuterojnis : the defining 

 angle is rounded off; from the interior of this curve rises a 

 transparent spine, itself slightly curving, against the outer 

 side of which the serrated finger impinges when clasped. 

 Almost parallel with the spine a strong tooth shoots up from 

 the palm, meeting the concavity of the finger, and beyond 

 this another, smaller tooth, nearer to the wavy line which 

 marks the hinge. The spine is capable of an independent 

 motion backwards and forwards in the line of the finger. 

 Under the microscope little circles or dark points in orderly 

 arrangement mark the places of insertion of the long bright 

 hairs, producing a very agreeable effect. 



It is right to notice the remarkably close resemblance of 

 this species to the Microdeuteropus [Gaynmarus) longipes of 

 Lilljeborg, taken at KuUaberg in Scania. But whereas in 

 our species the first gnathopods have the two processes on the 

 palm of the hand, in the foreign species they are stated to be 

 on the posterior margin. The words of Lilljeborg's description 

 are " Manus pedum thoracicorum primi paris iisdem secundi 

 paris majores, apud marem ovat^e, ad marginem posticum, 

 unguem propius, processibus duobus et aculeo intemo mobili 

 preeditge," which Mr. Spence Bate, in the British-Museum 

 Catalogue, thus translates : — " First pair of gnathopoda larger 

 than the second, having the propodos in the male ovate, fur- 

 nished on the posterior margin near the dactylos with two pro- 

 cesses and an internal movable spine." 



Boeck's description of the species says, " Pedes primi paris 

 apud marem articulo primo postice perdilatato et setoso ; carpo 

 permagno sed breviore quam manu; hac ovata, in margine 

 inferiore dentibus validis duobus armata." It may be remarked 

 that the first joint of these gnathopods in the Salcombe species, 

 though broad, is not very remarkably so, and is certainly not 

 setose ; nor is the finger in the third and fourth pairs of legs 



