, M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. I95 



différences, the shell is much darker and its posterior margin is strongly curved, but this is 

 without doubt due to âge, as the growth-lines, about half the length of shell, agrée with 

 Reeve's figure. 



Fam. SOLENIDAE. 

 Solen Linné. 

 1. Solen comeus Lamarck. 



Lamarck. An. s. vert. Ed. II, Vol. VI, p. 54. 



Philippi. Abb. neuer Conchylien, Vol. III, p. 44, Solen, PL 2, fig. 2. 



v. Martens. Sûss- u. Brackw.-Mollusken, p. 276. 



New Guinea. Merauke 1904. (Dr. Koch leg.) 



I hâve hesitated to ascribe the spécimens to 5. comeus, as the shape agreed in some 

 respects better with 5. timorensis Dkr. (Nov. Conch., p. 9, PI. 8, fig. 2), but I find nothing 

 of the rather well marked lines of that species, the colour being more uniformly yellowish-brown ; 

 the shell is larger than it should be according to most authors, but V. MARTENS (1. c.) men- 

 tions a spécimen long 91, high 16 mill. with a diameter of 12 mill., thèse measurements agrée 

 rather well with the spécimens under considération, the largest unbroken spécimen being 

 98: 15:?, the diameter could not be ascertained, as the shell, by the présence of the soft 

 parts, could not be closed. It cornes nearest to the figure of PHILIPPI ; it was not advisable 

 to describe a new form, on thèse materials, as the species seems to be variable, no two 

 figures being quite identical. 



Fam. Teredinae. 



Nausitoria Wright. 



1. Nausitoria hedleyi n. sp. PI. VII, fig. 3. 



Shell, if containing the soft parts, somewhat depressedly globular, the diameter being 

 larger than the height, whitish, covered by a thin, deciduous, light-brownish epidermis, darker 

 on the médian area, sculpture of the anterior area, which has a slightly rounded basai margin, 

 a slightly excavated anterior one and is irregular above, consisting of close, délicate ridges, 

 parallel to the basai margin, posteriorly it is separated from the antero-median area, by an 

 impressed, curved line; the antero-median area is rather narrow, its anterior free margin nearly 

 straight, and parallel to this margin run very close, beaded ridges, more or less rubbed off 

 towards the umbones," the médian area is narrow above, widened towards the free margin, 

 sculptured with irregular oblique riblets, posterior area with similar but coarser, waving riblets, 

 which continue on the small narrow auricle. Interiorly a thin, obliquely placed, fiât apophysis 

 projects in the cavity of the shell, and behind its base, towards the auricle runs the sub- 

 umbonal margin, which posteriorly is divided in a few cells. At the ventral tip of shell a 

 knob-like callus projects. with a short ridge running upwards, high near the callus, but be- 

 coming rapidly lower, until it disappears. Hinge tubercles flat and spiral above, irregular 

 below; anterior muscle scar occupying more than the basai half of the anterior area. 



Alt. of each valve 8, lat, 7"., mill. 



The palettes are very remarkable, having much the appearance of an old-fashioned 



Nov.n Guinea. XIII. Zoologie. 26 



