M. M. SCHEPMAN, LAND-" AND FRESHWATER MOLLUSCA ETC. 187 



the shell has a few very faint radiating ridges, especially traceable towards the posterio r 

 extremity; région of the lunula equally compressed. Ligament short, con s picuous, but not 

 strong. Cardinal teeth : one deeply grooved in the right valve, strong, thick, anteriorly very 

 strongly crenate, nearly consisting of lamellae, left valve wit'h two united teeth, anterior one 

 deeply grooved, whole surface strongly crenate, nearly digitate. Lamellae strong, low near the 

 umbones, higher posteriorly, one in the right valve, its crest rather faintly crenate behind, 

 two in the left valve, the exterior one by much the lowest, both very faintly crenate. An- 

 terior muscle-scars very deep, especially in the right valve, subquadrate, a small very deep, 

 ovate one below posterior end of teeth and another more conspicuous one in the right valve 

 below it, more or less confluent with the large anterior muscle-scar, posterior scars elongate, 

 much shallower but conspicuous, with a deep oval scar above it, at the end of the lamellae; 

 mantle-scar conspicuous. Nacre bluish-white, near the posterior part iridescent. 



Long 70 ; ait. (at the umbones) 24, (at the angle) nearly 31, diam. 17 mill. 

 New Guinea. Alkmaar, Oct. 6, 1909. 



This shell is according to Dr. Haas, who has examined it, allied to V. beccariatms 

 T. Can. (Fauna Mal. N. Guinea, p. 291, PL 1 r, fig. 2), which is however quite différent, not 

 only by its narrow shape, but also by its sculpture, though this character seems to be variable ; 

 but that species has another outline and is much less compressed posteriorly; it appears to 

 be nearer allied to my Unio (now Virgus) misoolensis, but is relatively much more elongate 

 and the beak or posterior part is much more rounded, besides there are other différences in 

 outline. I hâve the pleasure of naming it after its discoverer. 



B. Marine Mollusca. 



Amongst the Mollusca collected by Dr. LORENTZ, are a few marine and brackwater 

 species, a larger number has been collected by Dr. KOCH from Merauke and other localities ; 

 as the majority belongs to well known species, I hâve enlisted them, adding only a few 

 remarks and the description of a few new forms. The generic and spécifie names, may not 

 ahvays be up to date, as the opinion of récent authors disagrees still too much ; so this list 

 is more a simple enumeration than a perfect systematical review. 



Suborder Prosobranchia. 

 RHACHIGLOSSA. 

 Fam. VOLUTIDAE. 

 Cymbiola Swainson. 

 1. Cymbiola (Aulicaj flavicans Gmelin ? 

 Gmelin. Syst. Nat. Ed. XIII, p. 3464. 

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



A quite worn shell, cornes nearest to Voluta flavicans Gmel., only the uppermost of 

 the columellar plicae is slightly thinner and more oblique than in my spécimens, so I hâve 

 Nova Guinea. XIII. Zoologie. 25 



