138 MR JAMES COSMO MELVILL AND MR ROBERT STANDEN ON THE 



Hab. — Shore, and at 6 fathoms, Port Stanley, Falkland Islands. 

 This agrees with specimens from Punta Arenas we have compared it with in the 

 British Museum, and we are confirmed in our determination by Dr Strebel. 



Family Nassidse. 



Nassa (Ilyanassa) vallentini, sp. n. (Plate, figs. 8, 8«). 



N. testa ovato-oblonga, solidula, plicato-corrugata, plumbeo-brunnescente, anfractibus 7, quorum 2 

 apicales plus minus laaves, caeteris irregulariter longitudinaliter crassicostatis, apud suturas magis incrassatis, 

 impressis, aretissime" spiraliter liratis, liris rudibus, apertura rotundo-ovata, intus plumbeo-fusca vel brunnes- 

 ceute, labro tenui, columella paullum excavata, baud callosa, canali ad basim breviter recurva. 



Long. 14, lat. 8 mm. 



Hab. — On the shore, Port William, Falkland Islands. 



To some extent resembling N. (Ilyanassa) ohsoleta, Say. — a common estuarine species 

 on the Atlantic shores of the United States, — this Antarctic representative differs entirely 

 in characters of sculpture, being conspicuous for its irregular thickened plicate costae, 

 the whole surface being spirally sulco-lirate, mouth oval, leaden-coloured or red-brown, 

 outer lip hardly thickened, columella slightly excavate, with no callus, canal basally 

 shortly recurved. 



We name this Falkland Islands species after one who has in late years most 

 thoroughly explored that group, our friend Mr Rupert Vallentin. 



Family Buccinidse. 



Chrysodomus (Sipho) archibenthalis, sp. n. (Plate, fig. 9). 



C. (Sipbo) testa fusiformi, tenui, albo-cinerea, undique epidermide pallide straminea tenuissima praedita, 

 anfractibus, in specimine unico imperfecto, ad sex, quorum apicales duo leeves, submamillati, caeteris apud 

 suturas impressis, tumidulis, spiraliter arete liratis, liris anfractus ultimi circa 12 suprA peripberiam, apertura 

 ovata, columella paullum excavata, columella brevi. Operculo lutescente, unguiformi, corneo, nucleo ajucali. 



Long. 17, lat. 8 mm. 



Hab.—LoX. 62° 10' S., long. 41° 20' W., 1775 fathoms, trawl, March 10, 1903. 



Evidently not adult, and though this be the case, and the outer lip be to some 

 extent broken away, we think this Sipho is worth describing, the upper whorls being 

 very perfect. The ventricose, closely spirally lirate whorls seem characteristic. Only 

 one specimen occurred, from the abysmal depth recorded above. It may be many years 

 before another specimen is brought to light. We should imagine a full-grown shell 

 would be at least twice the size — say 35 mm. in length. 



Chrysodomus (Sipho) crassicostatvs, sp. n. (Plate, figs. 10, 10a). 



C. (Sipho) testa parva, ovato-fusiformi, solidula, albo-cinerea, periostraco tenui olivaceo-stramineo con- 

 tecta, anfractibus 5-6, quorum apicales 2-3 gradati, subhyalini, laeves, subtumidi, cgeteris spiraliter crassi- 

 costatis, apud suturas impressis, ventricosis, ultimum apud anfractum numero 7, interstitiis laevibus, apertura 

 ovata, labro'paullum effuso, columella excavata, ad basim breviter truncatula. 



Long. 6, at. 3 mm. 



