136 



several transverse rows of bristles. Eyes imperfectly developed, inconspicuous 

 in alcoholic specimens. Superior antennae with the 1st joint of the peduncle 

 shorter than the other 2 combined, 2nd joint fringed posteriorly with long 

 setae ciliated in a peculiar manner; flagellum shorter than the peduncle and 

 composed of 9 articulations ; accessory appendage about half the length of the 

 flagellum and 5-articulate. Inferior antennas but slightly exceeding in length 

 the superior, penultimate joint of the peduncle by far the largest, and forming 

 posteriorly a broad lamellar expansion fringed with long ciliated setae, last 

 joint of the peduncle rather short, with the posterior edge bulging out in 

 the middle, and likewise densely setiferous ; flagellum shorter than the peduncle, 

 and composed of 10 articulations. Gnathopoda subequal in size, the posterior 

 ones somewhat more slender, propodos in both much smaller than the carpus. 

 Antepenultimate pair of pereiopoda with the meral and carpal joints trans- 

 versely dilated and armed on the exterior face with several transverse rows 

 of short spines; penultimate pair the largest, meral joint about as large as 

 the basal, carpal joint rounded quadrangular; last pair with the basal joint 

 rather expanded, fully as large as the meral and carpal joints combined, 

 propodal joint somewhat broader than in the 2 preceding pairs. The outer 

 joints in all 3 pairs, edged with tufts of short spines. Last pair of uropoda 

 with the inner ramus somewhat longer than the basal joint of the outer, 

 both provided at the tip with a dense brush of bristles. Telson fully twice as 

 broad as it is long, cleft not extending to the middle, each terminal lobe having 

 a dense tuft of spiniform bristles at the apex and 2 similar bristles on the 

 middle of the outer edge. Colour, according to Sp. Bate, light yellowish 

 gray, or resembling the sand in which the animal lives . Length of adult 

 female 11 mm. 



Remarks. The external appearance of this creature is so remarkable, 

 that none of the naturalists who have observed it after the time of Slabber, 

 has ever hesitated in regarding it as the type of a very distinct genus. We 

 believe, however, that some of the most striking characteristics, especially the 

 very peculiar development of the pereiopoda, may strictly be explained as 

 merely adaptive modifications standing in close connection with the peculiar 

 habits of the animal, it being indubitably, of all known Amphipoda, the most 

 exquisite burrower. 



i 



Occurrence. I have never myself met with this form, nor seen any 

 Norwegian specimen; but Boeck states its occurrence at Karmo, west coast 

 of Norway, having, however, only found some shrunk fragments of the animal, 

 but no complete specimens. The figures here given have been drawn from 

 specimens kindly sent to the author from Dr. Stuxberg, director of the Museum 

 in Gruteborg. 



