74 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



third pleonal epimeron with straight, unserrated posterior edge and 

 small tooth at ventral corner; urosomite 1 with upright acute carina. 

 Mouthparts like T. sarsi ( = T. nana Sars 1895: pi. 27, fig. 1) except 

 outer plate of maxilliped as shown herein. Branchiae attached to coxae 

 5 and 6, each with a tubular accessory gill. 



Holotype: AHF No. 604, male, 6.5 mm. Unique. 

 Type locality: Station 6840, San Clemente Rift Valley, 32°-44'- 

 35''N, 118°-12'-43"W, 1620 m, January 30, 1960. 



Relationship: Closely related to T. trigonica (Stebbing 1888: pi. 9) 

 but differing from it in the presence of faint eyes, in the tooth of 

 third pleonal epimeron being smaller and more distinctly separated from 

 the posterior margin, and in the posterior lobe of pereopod 5 being nar- 

 rowed distally. The new species may prove to be a race of T. trigonica. 



Tryphosa propinqua Chevreux (1926) is similar to T. index but 

 its epistome is less strongly produced and the cephalic lobes are apically 

 rounded, not subacute. 



Uristes californicus Hurley 



Uristes californicus Hurley 1963: 91-96, figs. 27-29. 

 Canyon material: 6836(2). 



Family MELPHIDIPPIDAE 



Melphidippa (?) amorita, new species 



(Fig. 26) 



Description: This specimen has the aspect of a melphidippid but its 

 two most important parts, the antennae and uropod 3, are missing. 

 It cannot be firmly relegated to the Melphidippidae and, because of the 

 telson, it cannot be assigned to Melphidippa; until its missing parts are 

 discovered, the species is of provisional assignment. 



Characters relating it to Melphidippidae: eyes bulging; coxae very 

 short, but unlike other melphidippids the last three coxae are not bi- 

 lobed ; mouthparts all like Melphidippa; gnathopods and pereopods elon- 

 gated, gnathopods slender and poorly subchelate; pleonites 1-5 each 

 with a long dorsal tooth, marginal serrations present on pleonal epim- 

 era 1-4; uropods 1-2 elongated and with shortened outer rami. 



Telson rather short, the short cleft forming gaped bilateral, acute 

 lobes, not characteristic of other melphidippids. 



Holotype: AHF No. 6012, female, 6.4 mm. Unique. 



Type locality: Station 6836, Tanner Canyon, 32°-36'-00''N, 119°- 

 05'-18"W, 496 m, January 29, 1960. 



