NO. 5 BARNARD: AMPHIPODA 81 



Material: Three specimens from the type locality. 



Relationship: This species differs from the type species, P. tenellus 

 Stebbing (see 1897), in its poorly cleft, basally united telson with gap- 

 ing apices ; in P. tenellus the telson is very deeply cleft with gaping 

 apices ; the mouthparts are similar to those shown by Stebbing and the 

 first antenna fits the generic definition, having article 2 longer than ar- 

 ticle 1. The second maxillary lobes appear slightly more narrow and the 

 inner lobe of the second maxilla is more weakly developed in the present 

 specimen. It is in poor condition, for pereopods 3 and 5 are missing, 

 and uropods 1 and 2, the antennae, and the head are damaged. 



The new species differs from P. longicaudatus Dahl (1959) in the 

 short rami of uropod 3 and in the slightly projecting posteroventral 

 corner of the third pleonal epimeron. The first and second pleonal epim- 

 era were not described for P. longicaudatus. 



Pardisynopia synopiae J. L. Barnard 



Pardisynopia synopiae J. L. Barnard 1962b: 77-79, figs. 3, 4. 

 Canyon material :6'^Z6{2),6U5{\),6^A6{-\). 

 Slope material :27S9{1). 



Tosilus, new genus 



Diagnosis: Mouth parts not forming a conelike bundle; upper lip 

 with bilaterally sj'mmetrical lobes ; lower lip apparently with inner lobes 

 fused (not satisfactorily analyzed) ; mouthparts otherwise like those of 

 Pardaliscoides (see Stebbing 1897: pi. 12), with long maxillipedal palp, 

 short outer plates and obsolescent inner plates similar to those of 

 Necochea J. L. Barnard (1962d), inner plate of maxilla 1 even more 

 weakly developed, similar to that of Necochea; maxilla 2 with distinct 

 lobes as drawn herein ; mandible with palp ; antenna 1 with accessory 

 flagellum, articles 1-3 of peduncle successively shorter; fifth articles of 

 gnathopods very short, not lobed, sixth articles about six times as long 

 as fifth, slender, tapering, simple; pereopods simple; urosomal segments 

 not dorsally produced ; uropod 3 exceedingly small, not as long as the 

 short ramus of uropod 2 ; telson short, cleft halfway. 



Type species: Tosilus arroyo, new species. 



Relationship: This genus resembles Parpano J. L. Barnard (1964a) 

 in its miniaturized uropod 3, but the telson is cleft in Tosilus and en- 

 tire in Parpano. The gnathopods also are similar. Apart from the small 

 uropod 3, Tosilus differs from other pardaliscids as follows: from 

 Pardaliscoides Stebbing in the short peduncular article 2 of antenna 1 ; 

 from Halice Boeck in the short telson and short fifth articles of the 

 gnathopods; from Pardaliscella Sars in the obsolescent inner plates of 



