NO. 1531. ADDITIONAL NOTES ON THE AROULIDM— WILSON. 421 



joins the basipod it is enlarged posteriori}' into a rounded lobe, whose 

 surface is covered with rough papilhe. But the most prominent 

 feature of these legs is the enoi'mous lobe or lamina attached to the 

 posterior margin of the basipod. This is boot-shaped, as in the female, 

 but is fully twice as large, the toe of the boot being pointed, consid- 

 erabl}' widened, and turned forward so that it projects anteriorly in 

 front of the exopod. The flap thus covers the whole of the endopod 

 and about half of the exopod. 



The basipod of the third legs is also furnished with broad laminate 

 lobes, one along the posterior margin, which extends outward a little 

 beyond the base of the endopod, and another on the ventral surface 

 turned diagonally forward and outward. 



The peg on the anterior margin of the basipod of the fourth legs 

 and the semen receptacles on the posterior margin of the third legs 

 are as in other species. 



Female, total length 7.4 mm.; length of carapace 5.5 mm.; width 

 of same 5.1 mm. ; length of abdomen 1.8 mm. ; width of same 1.0 mm. 



Male, total length 8 mm.; length of carapace 5.9 mm.; width of 

 same 5.4 mm.; length of abdomen 2.1 mm.; width of same 1.45 mm. 

 Color (preserved material) a uniform creamy white with the dorsal 

 surface sparsejy covered with small spots of brown pigment. 



There is a noticeable absence of pigment spots over the testes in the 

 male and the ovary and semen receptacles in the female. 



About twenty specimens of this new species, including both sexes, 

 were obtained from a sucker (species not given) at Montpelier, Ver- 

 mont, and were sent to the U. S. Bureau of Fisheries at Woods Hole 

 in August, 1898. These have been made the types of the new species, 

 and are numbered 32829 in the catalogue of the U. S. National 

 Museum {apjKmdtculosus, with many appendages, referring especially 

 to the large laminate lobes on the posterior legs of the male, which 

 look like extra appendages). 



V. NOTES ON DEVELOPMENT. 



On October 9, 1902, a paper was read before the South London 

 Entomological and Natural History Society on '"'' Argulus foliaceu^^ a 

 Contribution to the Life History.-' 



This was written by Frederick N. Clark, one of the vice-presidents 

 of the society, and was published in their proceedings for 1902. It 

 proves to be a valuable contribution and one which has not gained the 

 prominence it deserves. This may be partl}^ due to the fact that it is 

 published in an entomological journal where one would not ordinarily 

 look for important papers on the Crustacea. 



