350 WEST AMEKICAN MOLLUSKS 8TEAKNS. 



Family LITTOHIN 1 D.K. 



(loiiiis TECTARIUS A'alfiuicnura. 



Tectarms atyphus Stearns. 



ri. L. Kijr. 5. 



Piolimiuary (U'sciiittiiMi, " Nautilus, " l>tH'euil)er, ISHl'. 



Shell small, ovato, siibtunoted, with live whorls; tho basal traversed 

 spirally by livo pniieipal obtuse keels, ov ribs, broken into nodules; of 

 these the iieripheral keels are the strouiivst ; between these ami below 

 the lower of the stronj^rr keels, fainter keels or striie are percei)tible; 

 the penultimate whorl shows three rows of nodules; of these the two 

 up])er arc the more piominent and the lower one is sutural and ineon- 

 spieuous. Color, dull ashen ehoeolate above, li.iihter below the peri- 

 phery of the basal whorl, and mottled below the h)west keel. Aperture 

 rather ovate than round, dark eolored within; eolumejla somewhat ex- 

 eavated and of a i)ale chocolate tint. Near the base of columella the 

 bint of a lightish band nmy be seen, from the edj;e of the outer lij), in- 

 Avard. 



Dimensions: Alt., (I.L'5; lat., I millimeters. 



A siiij»le example (Mus. No. 4:Sol)(>), from ^Manta. Ecuador, collected 

 by Dr. W. H. Joues, U. S. Navy. 



This is the tirst example of this poup of the Littoriuida^ detected on 

 the west coast of the American continents. It is rather nMuarkable, 

 when the abundance of Tirtarins Diuricatiis and its ally, Evhinclia nodu- 

 losa in the Antilleau Caribbean region is considered. 



Many of the so-called species of Litforiiia inhabiting the Caribbean 

 and Panamic waters or shores are so much alike as to at once suggest 

 a common ancestry within comparatively recent geological times. The 

 species described above is ipiite distinct from T. nuiricafiis or E. nodx- 

 losa, and exhibits in the details of its characters such dilierences as 

 to warrant specific designation.* 



Family TlinUNlD.F. 



(icnus ASTRALIUM l.iuk. 

 SuUpuus UVANILLA (liny. 

 Uvanilla legina Sti-arns. 

 ri. T-, Fi,!,'s. ti.T. 



rroliminary liesoription, "Nantihis," 1S1>L'. 



Shell conic, acute, imperforate, black or i)urplish black; whorls six 

 or seven, concave and longitudinally somewhat obliquely corrugated or 

 plicated, the jdicatious more or less ])roduced or overlapping at the 

 suture and periphery or edge of the basal whorl, ]>roducing a closely 

 creuulated or undulating efifect just above the suture, and at the basal 



* Yide Proc. U. S. Natioual Museum, A'ol. xiv, p. 326. 



