94 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



CYMATIUM OLEARIUM Linnaeus. 



Cat. No. 227774, U.S.N.M., two specimens from Port Alfred 

 (Coll. No. 869). Cat. No. 250435, U.S.N.M., one specimen from the 

 same place (Coll. No. 1308). 



CYMATIUM AFRICANUM A. Adams. 



Cat. No. 186786, U.S.N.M., one specimen from Port Alfred (Coll. 

 No. 147). 



CYMATIUM KLENEI Sowerby. 



Cat. No. 186789, U.S.N.M., two specimens from Port Alfred (Coll. 

 No. 150). 



Genus NYCTILOCHUS Gistl. 



NYCTILOCHUS ALFREDENSIS, new species. 



Plate 4, fig. 4. 



Shell similar to certain forms of T. australis Lamarck, but with 

 almost complete absence of nodules. Color orange, with obscure 

 squares and rectangular spots of brown. Nuclear whorls decollated. 

 Postnuclear whorls well rounded, appressed at the summit, moder- 

 ately constricted at the sutures, marked axially by rather irregularly 

 spaced, scarcely elevated varices, and numerous, very slender, closely 

 spaced, raised threads. The spiral markings consist of subequal 

 and rather closely, subequally spaced lirations. The same sculpture 

 holds good on the base and rostrum. On the latter, the spiral threads 

 assume a duplex development, some being coarser than others, the 

 coarser being separated by two or three of the finer. The last turn 

 has a single nodule a little behind the variced aperture, situated 

 almost midway between the summit and the periphery. Aperture 

 pale rose within, channeled anteriorly; posterior angle acute, outer 

 lip reinforced by a weak varix; columella sinuous, glazed with a callus 

 with several slight lirations on the anterior end; parietal wall pro- 

 vided with a slender lamella a little anterior to the posterior angle of 

 the aperture. 



The type, Cat. No. 186785, U.S.N.M., comes from Port Alfred 

 (Coll. No. 146). "It has lost the nucleus; the five turns which remain 

 measure: Length, 60.5 mm.; diameter, 31.2 mm. 



An additional specimen, Cat. No. 250436, U.S.N.M., from the same 

 source (Coll. No. 1309), has also lost the nucleus and probably some 

 of the early turns; the remaining seven measure: Length, 98 mm.; 

 diameter, 51 mm. In this the outer lip is reinforced within at the 

 edge. The reinforced portion consists of alternating bands of light and 

 dark, the lighter ones being about one-third as wide as the broad dark 



