42 U.S. NATIONAL MUSEUM BULLETIN 2 60 



edon tasmanicus J. L. Barnard is even more abnormal than is that 

 of H. strages J. L. Barnard and that of H. kergueleni (Miers) . 



All members of Ilippomedon resembling the type-species in coxa 1 

 and mandible occur in northern waters, whereas those differing from 

 the type occur in southern waters, regardless of depth. 



Section 2. — These genera, like ''''Tryfhosa^'' have a setulose but un- 

 ridged mandibular molar. They have close affinities but can be divided 

 into genera by characteristics of coxa 1 as in the hippomedon section. 

 The contrast in shape of coxae is best seen by comparing the diverse 

 assemblage of species in Anonyx and '"''TrypTiosa^'' The first genus has 

 a long, distally expanded coxa 1, whereas the latter has a slightly short- 

 ened and distally tapering coxa 1. If those attributes are accorded 

 rank over variables in upper lip, epistome, and gnathopods, then sev- 

 eral species must be transferred from one genus to another and per- 

 haps the genus Tmetonyx reinstated, as previously discussed. On the 

 other hand, the suggestion is made below (see Uristes perspi7iis) that 

 anonyx and tryphosa groups be established, with species allocated to 

 various subgenera. The diagnostic characters of the genera are shown 

 in table 2. 



Notes on other species. — Under the title Uristes perspinis is a dis- 

 cussion of the characters that subgenerically distinguish Uristes lepi- 

 dus J. L. Barnard (196-lb) from other members of the "tryphosa" 

 section. 



Tryphosites (?) coxalis J. L. Barnard (1962a) should be removed 

 from that genus to which Barnard questionably assigned it, because 

 of the absence of a constriction on the inner ramus of uropod 2. The 

 positive and negative alternatives of that character are seen to be rela- 

 tively consistent generically and are confounded only by Anonyx (see 

 Gurjanova, 1962). In addition, coxa 1 of T'. (?) coxalis resembles 

 that of '•'■TrT/phosa''' but the mandibular molar has both ridges and 

 setules. Although the ridged molar suggests the referral of 7". (?) 

 coxalis to Hippomedon of table 1, the reduction of coxa 1 is believed 

 to exceed the limits herein set for Hippomedon. The epistome is pro- 

 duced subacutely as in the type-species of Tryphosites but it assumes 

 a lesser importance as a generic character than do coxa 1 and the in- 

 cision ,of uropod 2, in view of the arrangements made in tables 1 and 

 2. Indeed, Tmetonyx serratus Schellenberg (1931) has a similar 

 epistome and thus is a parallel case. Except for the mandibular molar, 

 Tryphosites (?) coxalis is essentially a member of '"''Tryphosa'''' (table 

 2) and should be removed to that genus until a further study of the 

 minute molarial details can be made. 



Gurjanova (1962) did not transfer Tmetonyx nohilis (Stimpson) 

 (see review by Shoemaker, 1930) to Anonyx even though it strongly 



