274 
Holothuria floridana and Holothiwia atra 
O. Habitat. 
Atlantic Ocean : Florida, Pourtales, 1851 ; Selenka, 1867 ; Mexico, 
Ludwig, 1874; West Indies, Lampert, 1885; Cuba, Havana, Ludwig, 1883; 
Laiiipert, 1885; Jamaica, Ludwig, 1883; Porto Rico, Clark, 1901; St Thomas, 
Lampert, 1885 ; St Bartholomew, Guadaloupe, Theel, 1886 ; Venezuela, 
Puerto Cabello, Ludwig, 1883; Lampert, 1885; Azores, Herouard, 1902; Africa, 
Cape ob' Good Hope, Simon's Bay, Theel, 1886. 
The specimens in this paper are from Bahamas, Abaco, Green Turtle Gay; 
New Providence, Nassau, ; Florida, Elliott's Key, Key Largo, Caesar's Greek, 
Indian Key, Vaca Key, Bahia Honda, bettveen Salt Pond Key and Stock I., Key 
West, Tortugas; Porto Rico, Boqueron Bay, Fajardo, Mayaqaez, San Juan; Cuba, 
Havana ; Haiti ; St Thomas ; Caribbean Sea, Siuan I., Guracoa I. 
Semper, 1868, p. 88, says that Holothurids of this species live together in great 
crowds upon sandy places of the coral I'eefs, and ordinarily are so completely 
covered with small sand-grains that they are noticed only by the trained eye. 
Gardiner, 1901-3, 1908, notes this species as one of the sand-feeders found on 
the sand-flats and reefs within the lagoons of the coral reefs. 
IIL HOLOTHURIA ATRA JAGER. 
For the characters in which H. atra is like H. floridana I will simply refer to 
the descriptions given above. Tables of the characters observed are given as 
XXIV. and XXV. on pp. 275 and 276. 
A. Body. 
a. Form. 
Similar to H. floridana. 
b. Size. 
TABLE XXVI. 
1. Length in cm. 
Adult 
YoUDg 
Number of Cases... 
Mean 
Standard Deviation 
Coefficient of Variation . . . 
Range of Variation 
12 
16-367 + 1-475 
7-577 + 1-043 
46-295 + 6-374 
10-0— 33-5 
8 
8-200+ -628 
2-634+ -424 
32-121 +5-416 
2-5—11-0 
