322 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Measurements. — Immature female (46292), total length of carapace 

 31.1 mm., median length 26.8 mm., width including spines 25.2, 

 excluding spines 18 mm. Mr. N. S. Burnham saw one three times as 

 large. Young female, length 37, width 27 mm. (Brito Capello). 



Habitat. — Found crawling on logs just under the surface of the 

 water, and always seen in little patches of moss. (Burnham). 



Remarks. — -This species is undoubtedly a Lihinia, but the form of 

 the adult is not known. It is nearest L. dubia, having the same 

 number of protuberances. It is narrower than dubia of the same 

 length, and its narrow carapace and long horns led A. Milne Edwards 

 to place it in the genus Pisa. It also differs from dubia in having 

 only 8 spines of good size behind the front and those very long, 

 while the remaining spines are very small or obsolescent; the 8 long 

 spines form a cross, 4 being median and 4 in a line between the postero- 

 lateral angles. The 4 spines in a transverse row in front of this line 

 are inconspicuous. In dubia, while the 6 median spines are unequal 

 they are not strikingly so, the 3 dorsal branchial spines are subequal, 

 the last or posterior of the marginal spines may be the longest of the 

 arc but the others are also of good size. Orbit more open than in 

 dubia, the outer margin of the supraocular eave more concave, its 

 posterior angle prominent and conspicuous. The adult of erinacea 

 may prove to be only a variety of L. dubia. 



Range. — ^Florida Keys to western Cuba; 2 to 37 fathoms. 



Material examined. — 



Biscayne Bay, Florida; 1 mile N. of Feather Bed Bank; 2 fathoms; 

 S. G.; March 7, 1903; station 7481, Fish HawJc; 1 young female 

 (47100). 



Jewfish Creek, Florida; (a salt-water connection between Barnes 

 Sound and Blackwater Sound); N. S. Burnham; 1 young female 

 (46292). 



North of Knights Key Channel, Florida; 3 miles *NE. by N. of 

 East Bahia Honda Key; 11 feet; rky.; Jan. 22, 1903; station 7412, 

 Fish Hawk; 1 young female (47099). 



Pigeon Key Lake, Florida; 1 mile E. of East Bahia Honda Key; 

 103^^ feet; rky.; Jan. 7, 1903; station 7404, Fish Hawk; 1 young 

 female (47101). 



Cuba; on reef fiat between Cayo Hutia and Little Cayo, NE. of 

 light; Henderson and Bartsch, Tomas Barrera Exped.; 1 3'oung male 

 (48745). 



