98 IOWA STUDIES IN NATURAL HISTORY 



are quite differently placed from the two lines of coalescence of Exosphae- 

 roma crenulatum ; the posterior margin of the telson is different, the uropoda 

 have both blades slightly crenulate only on the distal end, and the lobes of 

 the second, third and fourth joints of the palp of the maxilliped are much 

 produced. 



The holotype and eleven paratypes are in the collections of the 

 State University of Iowa. Six additional paratypes are in the 

 collections of the U. S. National Museum, Cat. No. 53884. All 

 were collected from among the spines of a sea-urchin, Barbados. 

 Named for Professor C. C. Nutting. 



ONISCOIDEA 



Family Oniscidae 



Genus Pobcellio Latreille 



PoRCELLio PARVicoRNis Richardson 



Porcellio parvicornis Richardson, Trans. Conn. Acad. Sciences, 

 XI, 1902, p. 302, pi. 40, fig. 57.— Bull. 54, U. S. Nat. Mus., 1905, 

 p. 616, fig. 667. 



Three specimens of this species were collected at Indian River, 

 Barbados, May 21, 1918. Two specimens are in the collections, 

 of the State University of Iowa and one in the U. S. National 

 Museum, Cat. No. 53885. These represent the second record of 

 this species, which was described from a single specimen collected 

 by Prof. A. E. Verrill at the Bermudas in 1901, and deposited 

 in the collections of Peabody Museum, Yale University. 



EXPLANATION OF PLATE 



Fig. 1. Exosphaeroma nuUingi new species, type. 

 Fig. 2. Exosphaeroma niittingi maxilliped. 



