74 IOWA STUDIES IN NATURAL HISTORY 



thirds of the lower edge is separately roughened; remainder of palm smooth 

 and naked ; fingers of J dark brown with light tips, color not reaching quite 

 to base of immovable finger, color line vertical; a narrow interdigital gape. 

 In the minor cheliped the entire outer surface of the palm is very rough, the 

 granules arranged for the most part longitudinally; the fingers are less 

 gaping and are deeply grooved, the ridges very rough. 



In the female, the fingers are a lighter brown and in the largest female 

 the roughness on the major palm is less extensive. 



Ambulatory legs slender, bordered with long hair; merus slightly en- 

 larged, upper margin edged with slender spines. Daetyli noticeably slender. 



Relationships. — Of the Pilumnus in the West Indian fauna, 

 this approaches nearest to P. spinipes {= Micropaiiope spinipes 

 A. Milne Edwards i) in many details such as the ornamentation 

 of the antero-lateral margin, the partial roughness of the major 

 palm, the slender legs. On the other hand, the carapace of 

 harbadensis is more oval and more convex, front more deflexed, 

 and the minor palm rough all over, while in spinipes the granu- 

 lation is similar on the two palms. 



P. andreivsii Rathbun^ is a broad species with antero-lateral 

 margin similar to that of harbadensis, but the interregional fur- 

 rows are deeper, the upper orbital border has two small but dis- 

 tinct emarginations, the major palm is smooth, the minor one 

 nearly so. 



Pilumnus floridanus Stimpson 



Rathbun, Bull. U. S. F. C, vol. XX for 1900, part 2, 1901, 

 p. 40. 



W. N. W. of Lazaretto, N. N. W. of Pelican Island, Barbados ; 

 dredged in from 80-100 fathoms to where rocks begin at about 35 

 fathoms ; bag full of coarse sand ; sta. 53 ; 1 9 ovig. 



Not previously known south of Porto Rico and St. Thomas. 



Heteractaea ceratopus (Stimpson) 



Pilumnus ceratopus Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 



VII, 1860, p. 215. 



Needham Point, Barbados ; by diver ; 1 9 . 



Barbados; May 22; 1 juv. From coral heads; June 4; 1 6 

 4 $. 



Not recorded south of Guadeloupe. 



1 Crust. Reg. Mex., 1880, p. 326, pi. LIV, fig. 3. 



2 Bull. Lab. Nat. Hist. State Univ. Iowa, vol. IV, 1898, p. 266, pi. V, fig. 2. 



