16 THE NAUTILUS. 



The nearest neighbor is Planispira trochalia Benson, from the 

 Andaruans, from which, however, it is very distinct. This species 

 would probably fall within the subgenus Trachia, even though its 

 last whorl is not descending. The pitted surface indicates the pres- 

 ence of hairs in young specimens a special character of this group. 



13. Macrochlamys Dohertyi n. s. PI. 2, figs. S, 9. 



Shell perforate, depressed, nearly planulate above, thin, shining; 

 excavated about the umbilical region. Whorls 4*, convex, exca- 

 vated at the sutures. Aperture lunate-circular. Lip simple, 

 slightly reflected over the umbilical perforation. Growth lines 

 strong below the suture, becoming faint on the periphery, a trace of 

 faint revolving strife on the base. 



Alt. 6, maj. diam. 13$, ruin. diam. 11 mm. 



Spire more depressed than in M. amboinensis Mart., var. perforata 

 Bttg. (Java) and umbilicus smaller. Resembles also M. malaccana 

 Pfr. (Sumatra), but has more impressed sutures. 



14. Helicarion albellus Mart. var. 



I refer this doubtfully to albellus, which has a somewhat shorter 



spire. Probably a localized variety of the Javan species. 







15. Glessula ? 



Specimen too poor for satisfactory identification. 



16. Prosopeas argentea n. s. PI. 2, fig. 10. 



Whorls fully 8, slightly convex. Apex obtuse. Sutures well 

 impressed. Aperture oblique, elongate, pointed above, dilated in 

 the middle, narrow below. Lip sharp and thin ; columella slightly 

 arcuate ; ends of lip connected by an exceedingly thin shining cal- 

 lous. Growth lines closely crowded, strong and roughened. First 

 or apical whorls regularly costulate. Color shining silvery white, 

 becoming yellowish toward the base. Height 23, diam. 6 mm. 



The Stenogyras are widely distributed throughout the Malayan 

 province, being represented in all the islands by more or less closely 

 allied species.. This resembles Opeas acutissima Bttg. ( 0. hastatus 

 Bttg.), of Java, in color and sculpture, but is less slender and has 

 fewer whorls. It is a much larger shell than 0. achatinacea Pft\, 

 of Java. It differs from Opeas paroensis Bock, of Sumatra, in being 

 a larger shell with a smaller apex. Stenogyra echelensis de Morg. 

 of Perak, bears a strong resemblance to this Enganio form. 



