22-t Mr. O. Sund on 



text and in the drawing, thus precluding the possibility of 

 referring any new finds to his species, as the genus Stereo- 

 mastis (sensu de Man) is especially ciiaracterized by the 

 great constancy of the arrangement of the spinous armature. 



Stereomastis auriculata, Bate. 



The type (holotype) is a female, 49 mm. long. Length of 

 carapace = 22, breadth 15, distance from cervical sulcus to 

 posterior edge 9 mm. Median ridge spine-formula : 

 211121C22^. 



The two hindmost spines, designated by 2, are very large. 

 The lateral edge is armed w itii 5 + 3+7 spines. On the 

 gastral area is a row of four spines, on the branching point 

 of the cervical ridge one, and on the anterior branch one 

 spine. The branchial ridge carries eleven spines. 



Polycheles helleri, Bate. 

 Stereomastis helleri, de Man, ' Siboga ' Monogr. 39 a 2. 



The type (from S'at. 218, N. of New Guinea) is figured in 

 pi. xiv. fig. 2 and pi. xv. fig. 1. Esp'cially the hist-n;imed 

 figure is quite misleading. The lateral edge carries 6 + 3 + 2 

 spines + a number of rudimentary ones in its posterior part. 

 Ihere is a spine in the middle of tlie anterior branch of tiie 

 cervical ridge not shown in the figure (xiv. 2). Total length 

 47, carapace 22 mm. 



The other specimen (from Stat, 170, near Kermadec 

 Islands, N. of New Zealand) is certainly of a species distinct 

 from the type. The median ridge carries the same sequence 

 of large spines, but the spaces between these are occupied by 

 numerous small spinulesset in single row. Along the lateral 

 edge are found 7 + 4 + 14 wcll-develop<'d spines. On the 

 cervical ridge no spines are found. Total leugtli 32, lengtli 

 of carapace 16, breadth 10*5 mm. 



As the specimen from Stat. 170 seems to differ funda- 

 mentally from all other species described in several of the 

 characters mentioned above, it lias a claim to a name of its 

 own, and I take the liberty of proposing for it the name 



Stereomastis kerniadecensis, sj). n. 



Pentacheles gracilis^ Bate. 

 Polycheles gracilis, de Man, I. c. 



The single specimen (from Stat. 174, 19° 8' S , 178° 20' E.) 



