10 BIOLOGICAL SURVEY OF 



SphaeroneUa caprellae spec. iiov. (fig. 4) 



Female: The body is of the usual globular shape. Short 

 hairs are present around the genital area and furca. The 

 frontal margin is evenly rounded, without hairs. The second 

 maxillae have a nearly cylindrical basal joint and a short 

 terminal joint armed with a single claw. The maxilliped is 

 somewhat longer than the head and rather slender. There 

 is no chitinous bar at the base. The basal joint is about three 

 and a half times as long as wide and slightly expanded clis- 

 tally. The rest of the appendage just misses being as long 

 as the basal joint and is composed of two joints of about the 

 same length. They are half the width of the basal joint. 

 The terminal joint is armed with a subterminal spur and two 

 terminal claws. 



Male: Frontal margin evenly arched, with three or four 

 hairs above the base of each antennule. The second maxilla 

 is nearly as in the female. The maxilliped is similar to that 

 of the female, except that it is shorter proportionately and 

 the basal joint bears a distally directed spine on the medial 

 margin near the base, followed by a hump. The basal joint 

 also bears a few hairs at the mediodistal corner. 



Length : Female, 0.68 mm. ; male, 0.26 mm. 



Type : Female, B 170 ; cotype, male, B 131. 



Host and site: Marsupium of Caprella linearis (Crus- 

 tacea Amphipoda). 



Remarks: This is the second species of Choniostomatidae 

 to be found on a species of Caprellidae. The other is 

 S. aeginae Hansen. I quite agree with Hansen in his remarks 

 on the extreme rarity of SphaeroneUa parasitic on 

 Caprellidae. 



