PYCNOGONIDS 273 



Remarks. As shown in the table above, this remarkably large repre- 

 sentative of the genus Ammothea has been found only at St. Paul Island, 

 presumably in shallow water. Besides by its large size, it may be dis- 

 tinguished by its relatively very large and peculiarly shaped proboscis, the 

 nearest approach to which would seem to be found in this genus in A. 

 magniceps Thomson ('84, p. 244, pi. xv, figs. 1-5, and pi. xvi, fig. 3). 



Genus" Ammothella (Verrill). 

 Ammothea (in part). 

 Ammothella (subgenus) VERRILL, :oo, p. 581. 



Similar in most respects to Ammothea, from which it differs principally 

 in the fact that the trunk is usually proportionately broader and dis- 

 tinctly segmented, the chelifori 3-jointed, 1 and the palpi g-jointed (some- 

 times io-jointed?), while the femoral joint lacks the projection at its distal 

 and always present in Ammothea proper. 



J?emar&s.Dohni ('81) described three species of Pycnogonida from 

 the vicinity of Naples which present the characters outlined above, but 

 he included them all in the genus Ammothea. Recently Verrill (IOO, p. 

 581) has reported a species from the Bermudas which is very insufficiently 

 described, but which agrees with the forms reported by Dohrn except 

 that, according to Verrill, the Bermuda specimen has io-jointed palpi. 

 Verrill named his specimen "Ammothea (?) rugulosa" and, evidently be- 

 cause it differed from typical Ammothea in the number of joints in the 

 palpi, made a new subgenus for it which he called Ammothella. From a 

 study of the specimens described in this paper I believe that they, to- 

 gether with Verrill's species and the three species A. appendiculata, A. 

 uni-unguiculata and A. bi-unguiculata of Dohrn may properly be put into 

 a genus distinct from the restricted Ammothea, and to this I give the 

 name Ammothella proposed as a subgeneric name by Verrill. 



AMMOTHELLA TUBERCULATA sp. nov. 

 Plate xii, fig. 7 ; plate xx, figs. 1-6. 



Type. ? , University of California, No. 19,508, Northern California. 



Trunk broad, elliptical, segmentation clearly marked ; anterior corners 

 produced into short rounded tubercles ; the first, second, and third seg- 

 ments each with a conical tubercle dorsally near its posterior border (this 

 was lacking on the third segment in one of the specimens, Lot 22), anterior 

 of these tallest, decreasing in height posteriorly ; lateral processes short, 

 only half as long as breadth of trunk, closely crowded, somewhat broader 



1 Dohrn ('81, p. 154) considers the chelifori 2-jointed and explains the 3-jointed 

 appearance by saying: " Sic ist auf weit ausgezogenen Basalstucken eingelenkt." 



