56 Addison E. Verrill, 



phosphorescent organ) in front of which there is a small round 

 internal organ (ganglion?) ; on the upper side are two pairs of 

 minute appressed spines (pi. 18, figs. 3, 40), a pair before and one 

 behind the ventral tubercle. The tip is narrow and bears three 

 pairs of spines ; the outer one more than twice as long as the next 

 inner; third minute. (See pi. 18, figs, n, 12.) 



The female has no tubercle on the under side of the telson, and 

 the telson is relatively a little longer in proportion to the uropods 

 (fig. 13). The terminal and dorsal spines of the telson are very 

 liable to be broken off in preserved specimens, as well as various 

 frontal organs, such as the antennal scales, etc. 



Length of the larger males, 12 to 13 mm, including rostrum and 

 uropods; length of neck, 2mm; of thorax, about 1.4 mm; of 

 uropods, 2 mm. Females are usually somewhat larger than the 

 males. 



Some of our specimens give the following ratios of the length 

 of the neck to that of the rest of the thorax: No. i $ ; ratios 

 i .4 : i ; No. 2 $ , ratios i .36 : i ; No. 4 $ , ratios 1.2:1; No. 25, 

 ratios 1.04: i. The ratios of the neck to the total length was in 

 No. i, i : 6.4; No. 2, i : 6.94; No. 25, i : 6.8. 



Measurements of No. i were as follows : length of neck, 1.2 mm ; 

 of thorax, 0.88; of abdomen, 4.5 to base of telson; sixth segment, 

 1.25; outer uropods, 1.3; telson, 0.60; eye and stalk, 0.36; 

 longest legs, 1.65; third maxilliped, 0.46. 



I have referred this species to L. faxoni, although it differs 

 somewhat from the figures of Faxon, and the later description by 

 Hay and Shore, as shown below. It agrees almost as nearly in 

 most respects with Bate's figures, renamed L. affinis by Borradaile. 

 the slight differences being due, perhaps, to the modes of prepara- 

 tion and to errors in the drawings. (See pi. XVIII, figs. 8-8 d.) 



According to Borradaile L. faxoni has the following diagnostic 

 characters : Neck-like portion longer than the rest of the cephalo- 

 thorax. Eye and stalk rather more than a third and not more 

 than half the length of the neck, the stalk rather stout. The last 

 (third) leg reaches to the end of neck or beyond it. Sixth 

 abdominal segment not much, if at all, longer than the uropods ; 

 exopods of uropods rounded at the end, less than five times longer 

 than wide; its spine projects beyond the end. Ventral lateral 

 spine of 6th abdominal segment of the male sharp, not followed 

 by a pair of spinules. 



