CAPRELLIDAE OF WESTERN NORTH ATLANTIC 61 



The degree of spination of the dorsal surface of the pereonites 

 varied considerably. The most spiny specimens had 1 posterior spine 

 on perenoite 1, 2 at midlength, and 1 posterior spine on pereonites 

 2-4, and 2 spines at midlength on pereonite 5. Some of the specimens 

 showed different degrees of reduction of these spines, usually losing 

 the spines at midlength first. 



In some of the specimens, grasping spines were present on the 

 propodus of pereopod 5. 



The mouthparts were rather consistent. The setal formula for the 

 terminal article of the mandibular palp varied only from 1-3-1 to 

 1-5-1, and the outer lobe of the maxilliped occasionally had a seta 

 at midlength on the medial margin in addition to 3 apical and 1 seta 

 on the middle of the anterior surface. 



Distribution. — Type-locality: KeyBiscayne,Fla., on bridge pilings 

 in Bear Cut, 2 m, July 15, 1966, 1 male holotype USNM 120179. 



Other records: Bermuda, Oct. 10, 1960, 1 male paratype USNM 

 120188. Soldier Key, Fla., Jan. 27, 1961, 1 male paratype USNM 

 120186. Hummelinck sta. 1413, East of Soldier Key, Fla., 2 m, 

 Sept. 5, 1963, 1 male paratype USNM 120184. Soldier Key, Fla., 

 1-2 m, July 16, 1966, 2 male paratypes USNM 120185. Key Largo, 

 Fla., July 9, 1966, 1 female allotype USNM 120180. Long Key, Fla., 

 May 11, 1961, 1 male paratype USNM 120183. Tortugas, 1 female 

 paratype USNM 120182. Freelance sta. 85-56, west shore of lagoon 

 near Oyster Pond Landing, Barbuda, Apr. 6, 1956, 2 female para- 

 types USNM 120187. Freelance sta. 47-56, off Pigeon Island, St. 

 Lucia, 1-3 m. Mar. 22, 1956, 1 male paratype USNM 120181. 



Remarks. — This species is named for Key Biscayne, Fla., W'here 

 the holotj'pe was collected. The only habitat records for this species 

 are from red algae. It is difficult to detect this species since it is quite 

 small and usually is covered with detritus. 



Hemiaegina Mayer, 1890 



Flagellum of antenna 2 biarticulate, swimming setae absent; man- 

 dibular palp absent, molar present; outer lobe of maxilliped larger 

 than inner lobe; gills on pereonites 3 and 4; pereopods 3 and 4, 1- 

 segmented, pereopod 5, 6-segmented; abdomen of male and female 

 with pair of biarticulate appendages. 



Type-species: Hemiaegina minuta Mayer, 1890 (by monotypy). 



Hemiaegina minuta Mayer, 1890 



Figures 29, 30, 50 



Hemiaegina niinvta Mayor, 1890, p. 40, pi. 1, figs. 25-27, pi. 3, figs. 32-35, pi. 5, 

 figs. 52-53, pi. 6, figs. 13, 33-34, pi. 7, fig. 4; 190.3, p. 65, pi. G, fig. 75.— 

 Arimoto, 1930, pp. 45-47, fig. 2.—? Barnard, 1937, pp. 134, 198.— Utinomi, 



