I. '21. 34 



been done by American authors. It is true that there are 

 considerable variations in the form of the left cheliped, but 

 between the extremes of the pubescens type and the Kroyeri 

 type there are a large number of transitional forms. The 

 specimens taken by the Helga may be divided as follows : — - 



^ ? 



Kroyeri type . . . . 3 2 



Pubescens type . . . . 5 2 



Transitional forms . . 8 



The form of the left cheliped does not appear to vary con- 

 sistently according to the depth, as specimens of both types 

 have been taken in water as shallow as 20 fathoms and as 

 deep as 480 fathoms. 



Eupagurus Prideauxii (Leach). 



Plate II, figs. 1-3. 



Pagurus Prideauxii, Bell, 1853. 



Eupagurus Prideauxii, Heller, 1863. 



Eupagurus Prideauxii, Henderson, 1886. 



Eupagurus Prideauxii, Bonnier, 1887. 



Eupagurus Prideauxii, Milne-Edwards and Bouvier, 1900. 



The middle of the frontal margin of the carapace is not pro- 

 duced into a definite rostral process, but is rounded. The 

 lateral projections just above the outer edge of the eyestalks 

 are well-developed and produced into fairly sharp points. 

 The cervical groove is well-defined. The whole surface of the 

 carapace bears scattered tufts of minute setae, which are 

 longest and most plentiful on the anterior lateral parts. The 

 carapace does not become so broad posteriorily as in E. Bern- 

 hardus, the abdomen is more slender and the whole animal 

 less strongly calcified. 



The eyestalks are much thicker than in the preceding species 

 and are strongly dilated distally. The cornea is densely 

 pigmented and is deeply and widely emarginate dorsally. 

 The ophthalmic scales end in rather sharp points and are 

 fringed with setae ; they are more slender than in E. Bernhardus. 

 The eyes reach to beyond the base of the third joint of the 

 antennular peduncle when the latter is fully extended, and at 

 least to the middle of the last joint of the antennal peduncle. 



The antennular peduncle is composed of slender cylindrical 

 joints, the third the longest. The two flagella are of the usual 

 form, the upper about as long as the ultimate antennular joint. 



The antennal peduncle is similar to that of E. Bernhardus, 

 but the scale is more slender, less curved and shorter, reaching 

 just beyond the tip of the eyes. The external process of the 

 second joint reaches only to the middle of the fourth joint. 

 The antennae are about three and a half times as long as the 

 carapace. 



