LAMBEUS HASSLERI. 15 



laciniated teeth posteriorly ; the largest of these teeth is situate at the lateral 

 angle of the carapace. There is one very prominent tooth on the postero- 

 lateral margin, together with three or four smaller ones. The edges of the 

 segments of the chelipeds are furnished with granulated spines and the ex- 

 posed surfaces of all the segments are tuberculate ; on the lower face of the 

 propodus the more prominent tubercles are arranged in a longitudinal median 

 row. The merus joints of all the ambulatory appendages are spinulose on 

 their upper and lower edges, and on the last pair there are also a few 

 rudimentary spines or tubercles on the carpus and one near the middle of 

 the upper margin of the propodus. Distinct traces of red transverse bands 

 are to be seen on the upper surface of the cheliped, two on the merus, one 

 on the carpus, one on the propodus, and one on the base of the dactyl us. 

 Abdomen tuberculous in both sexes, the most prominent tubercles being on 

 the middle of each segment fiora the second to the sixth inclusive. 



Dimensions of a female : length of carapace, 27 mm. ; breadth of cara- 

 pace, including lateral teeth, 38 mm. ; length of merus of cheliped, 30 mm. ; 

 length of propodus of cheliped (to base of dactylus), 33 mm. 



Station 3368. 66 fathoms. 1 fem. 



" 3427. 80 " 1 male, 1 fem. 



This species was previously obtained during the voyage of the " Hassler " 

 at Magdalena Bay, Lower California, August 14, 1872. The specimens then 

 collected (3 <?, 1 ?, dry) were apparently picked up dead on the shore. In 

 three of these examples the more prominent tubercles on the carapace are 

 longer and more spine-like than in those obtained by the " Albatross." 



Lambrus hasskri is the Pacific coast representative of L. pourtalesii Stimps. 

 of the eastern coast of North America. The two species are very closely 

 related, but L. hasskri differs from the eastern form in the following par- 

 ticulars : the carapace is broader in proportion to its length ; the branchial 

 regions are more expanded and inflated, and this inflation extends further in 

 toward the cardiac area, so as to involve the oblique row of small tuber- 

 cles : that is to say, this row of tubercles, which in L. povrtaksii lies low down 

 in the fossa which separates the branchial from the cardiac area, is raised up 

 in L. hassleri on the swell of the branchial region. The spines on the edges 

 of the chelipeds, moreover, are not laciniated to such an extent as they are 

 in L. ponrtalesii. 



Professor S. I. Smith, misled by imperfections in A. Milne Edwards's figure 

 ol L. poiirtalcsii, has redescribed that species under the name o^ Lambrus ver- 



