Decapod Crustacea of Bermuda, Part II. 59 



from the longer neck of affinis, are in the form of the petasma and 

 the male organ of the second pleopods. If correctly drawn in 

 Bate's figure (his pi. 80, our pi. 18, fig. 8b), the petasma is larger 

 and more complicated than in our specimens (pi. 18, figs. 6-9) or 

 in Faxon's figures (pi. 18, fig. 7). The same organ, as figured by 

 Brooks, is quite unlike either of the other figures. It seems some- 

 what variable in form in the large number of specimens examined. 



The male appendage of the second pleopods in Bate's figure 

 (pi. 18, fig. 8d) has a wide, oblique, terminal part, while it is 

 narrow and subacute in our species (pi. 18, figs. 5, 50). The 

 female in our species does not have such sharp spiniform termi- 

 nations to the angular lobes of the abdominal segments, at the 

 bases of the pleopods, as shown in Bate's figure (his pi. 83). In 

 our species they are angular, as in the male, but not dentiform nor 

 spiniform, but Bate's figure may be erroneous in this respect. 



The "neck" is relatively longer in Bate's figures (see pi. 18. 

 fig. 8) than in Faxon's and in my specimens (pi. 18, fig. i), while 

 the uropods and telson are shorter. In Bate's figure, the propor- 

 tion of uropods to neck is about 1:1.6; in Faxon's they are 

 practically equal. In Bate's figure the neck is nearly equal to 

 the combined length of the thorax and first two abdominal somites ; 

 in our specimens it is less than the thorax and first abdominal 

 somite. 



Borradaile refers to the figures given by Bate on his pi. 83 (our 

 pi. 1 8, figs. 8, 8d) as illustrating his L. affinis. These figures differ 

 from the later description by Hay and Shore as follows : 



Proportion of eye and stalk to neck is i : 3.5, not i : 3. Antennal 

 peduncle to first article of antennular peduncle is i : 1.25, not i : 2. 

 Second and third legs reach to about the distal third of the neck 

 of the female, or distal fourth of the male, not almost to the end. 

 Sixth abdominal segment is rather longer than the sum of the 

 two preceding. The telson of the female is less than one-half 

 the length of the uropods. The various spines, spinules, and 

 forms of the appendages agree closely. 



It seems to me that the above variations in the figures are too 

 small and uncertain for the positive differentiation of species. In 

 one lot, before me, containing several hundreds of specimens, 

 greater variations in some of the proportions occur. These were 

 from the region of the Gulf Stream, Albatross Station 2711, No. 

 12015. Both forms are likely to occur at the Bermudas. 



