28 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



Previous records. — 

 St. Martin: Van Rijgersma (Streets). Curagao: C. J. van der Horst 

 (Schmitt). 



Material examined. — 

 A20-39. Isla La Tortuga, Venezuela; Apr 13, 1939; shore. Id (im- 

 mature), 1 young. 

 A25-39. Isla Cubagua, Venezuela; Apr 14, 1939; shore. 1? (im- 

 mature; soft shell). 



Aleasurements. — Male, 2.6 mm; female, 2.5 mm; young, 2.1 mm. 



Remarks. — Known from the littoral, among stones. This appears 

 to be an exceptionally small species. 



POLYONYX Stimpson, 1858 

 Polyonyx gibbesi, new name 



Porcellana 77iacrocheles Gibbes, 1850, p. 191 (type locality, coast of 



South Carolina) ; 1854, p. 6, pi. 1, fig. 5. 

 Polyonyx macrocheles Stimpson, 1858, p. 229; 1871, p. 120. Kingsley, 



1880, p. 408. Smith, 1880, p. 266. Ives, 1891, p. 192. Benedict, 



1901, p. 138. Rathbun, 1905, p. 14. Enders, 1905, p. 37. Pearse, 



1913, p. 102, pi. 1, text-figs. 1, 2a, 3-5. Sumner et al, 1913, p. 



669. Hay and Shore, 1918, p. 405, pi. 29, fig. 8. Schmitt, 1935, 



p. 189. Pearse et aL, 1942, p. 185. 

 IPorcellana creplinii Miiller, 1862, p. 194, footnote (nomen nudum) ; 



1863, p. 47, footnote. 

 ^Porcellana (Polyonyx) creplinii Miiller, 1870, p. 54. 

 Porcellana (Polyonyx) Tuacrocheles Faxon, 1879, p. 256, pis. 2-3. 



Previous records. — 

 Massachusetts, Woods Hole: (Pearse). Rhode Island, Narragansett 

 Bay: W. Faxon (Faxon) ; Newport: A. Agassiz (Faxon). Incertae 

 sedis, Devils Foot Island: D. H. Tennent (Sumner et al.). North 

 Carolina, Beaufort and Shark Shoal: H. E. Webster (Kingsley); 

 Beaufort: (Enders; Hay and Shore); Fort Macon: (Pearse et al.). 

 South Carolina: T. L. Burden (Gibbes, 1850); Charleston: (Faxon). 

 Florida, off Manatee River, 9-12 ft: Acad. Nat. Sci. Philadelphia 

 Exped. (Ives); Sarasota Bay: H. E. Webster (Kingsley). Puerto 

 Rico: (Schmitt). 



Material examined. — 

 A2-39. Bahia Caledonia, Panama; Apr 3, 1939; 1-7 fms. IcT. 



Measurements. — The single male specimen in the collection was 5.2 

 mm in length. 



