no. 3613 TWO NEW CRUSTACEANS — BOWMAN AND KORNICKER 9 



those given by Hansen (1897) for Sphaeronella. The copepodid of 

 Sphaeronellopsis being unknown, we assigned the Pseudophilomedes 

 parasite provisionally to Sphaeronella. When adults are discovered, 

 it may become necessary to reassign it to the genus Sphaeronellopsis. 

 It differs from the copepodid of S. monothrix most noticeably in the 

 structure of the 2nd maxilla and maxilliped, especially in the lack of 

 serrations on the 1st segment of the latter. 



Because S. monothrix in some respects is intermediate between 

 Sphaeronellopsis and Sphaeronella, it is useful to compare it with 

 species of the latter genus. The female of S. monothrix is distinguished 

 from those of species of Sphaeronella by the single seta on the trunk 

 legs and caudal rami, the 2-merous 1st antenna, the absence of the 

 2nd antenna, and the distinctive structure of the 2nd maxilla and 

 maxilliped. The number of seta on the trunk legs (which may be 

 absent) varies from (in S. acanthozonis) to 3 (in S. frontalis) , with 2 

 being most common. Only in S. capensis and S. gitanopsidis do 

 the legs have a single seta. The caudal rami of Sphaeronella may be 

 absent or be armed with (S. acanthozonis) to 5 (S. leukarti, of 

 Green, 1958) setae, mostly frequently 2. A single seta is present in 

 S. gitanopsidis, S. holboelli, and S. acanthozonis. 



The 1st antenna is usually 3-merous in Sphaeronella; only S. decorata 

 resembles S. monothrix in having a 2-merous 1st antenna with a long 

 1st segment. The 2nd antenna is absent in about 5 species, but 

 present in most species of Sphaeronella. The maxillipeds are usually 

 4-merous, but are 3-merous in a few species. 



The shape of the male body, with the nearly round head and 

 narrow trunk is quite distinctive. Among the other characters that 

 separate the male S. monothrix from species of Sphaeronella are the 

 absence of bans from the head except on the posterior parts of the 

 lateral margins, and the absence of trunk legs. 



Parasterope Poulsen, 1965 

 Parasterope pollex Kornicker, new species 



Figures 4-7; Plate \a,b 



Cylindroleberis mariae.— Cushman, 1906, p. 366, pi. 29 (figs. 19-25) [not Baird, 



1850]. 



Types. — Holotype, gravid female, USNM 114048, from station 

 2906, Hadley Harbor, Mass., in alcohol. Allotype, adult male, 

 USNM 114049, dissected on slides. Paratypes, 16 adult males, 62 

 females, 11 juveniles, USNM 114050-114059. 



Etymology. — The specific name "pollex," from the Latin noun 

 meaning "thumb," refers to the thumblike dorsal process on the 

 dorsum. 



248-330—67 2 



