LEPECHINELLIDAE 



187 



dorsal carina raised into a tooth posteriorly ; segment 4 with an upstanding tooth ; seg- 

 ment 6 with a small median tooth at base of telson, and a smaller lateral one at base of 

 uropod 3 ; segments 5 and 6 united, but with the suture visible, at least laterally, and 

 marked by a line of setules. Postero- inferior angle of segment 1 quadrate, of 2 and 3 

 produced in a short point. Telson cleft nearly to base, lateral margins straight, acute 

 apex of each lobe bearing a stout spine or seta (broken, length therefore uncertain). 



Antennae without particular features, similar to those of chrysotheras, the accessory 

 flagellum very minute; none of the flagella preserved intact. Mouth-parts in general as 

 in the other species ; armature of outer plate of maxilliped as in drygalskii, inner lobes 

 of lower lip well developed. 



6. c. 



Fig. 114. Lepechinella cetrata,nsp. a. General view. b. Telson (spines broken). 

 c. 5th~7th joints of peraeopod 1. 



Gnathopod 1 very similar to that of drygalskii, the 5th joint being distally more ex- 

 panded and the 6th joint more ovate than in chrysotheras. Gnathopod 2 similar to that 

 of chrysotheras . Peraeopods 1 and 2 are remarkable for the elongate dactyls, which equal 

 the 2nd joint in length ; and the 4th-6th joints have even longer spines than in chryso- 

 theras. Peraeopods 3-5, 4th-6th joints also with long spines, but the dactyls do not 

 exceed the 6th joint in length. 



Uropods as in chrysotheras, but more spinose. 



Branchiae strongly pleated basally. 



Remarks. Easily distinguished by the lack of spinous projections in comparison with 

 the other species, which are heavily armed ; a character to which the specific name refers. 

 Other points of note are the deeply cleft telson and the very long dactyls of peraeopods 

 1 and 2. The side-plates are not very different from those of drygalskii. 



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