1042 NODULARIA 
“This interesting species, collected by Verreaux in 1845, 
inhabits Senegal. The exact locality, where it was found, is 
unknown to me.” 
NopDULARIA ERLANGERI Kobelt. 
“Shell rather small, oval, shortly rounded in front, subros- 
trate posteriorly, rather solid, but not heavy, very coarsely 
striate, scarcely shining, olive-brown. Dorsal and ventral mar- 
gins nearly parallel, slightly curved, the latter sometimes a 
little subsinuate posteriorly. Beaks anterior, situated at 1/4 
the length, not prominent, greatly eroded in the specimens 
examined. Cardinal teeth of the left valve compressed, coni- 
cal, the anterior the larger, separated by a sublateral pit; 
cardinal tooth of the right valve obtusely conical, lightly crenu- 
late, separated from the margin by a deep groove; laterals 
thin, sharp, and at a decided angle with the cardinals, from 
which they are separated by a long interdentum; anterior 
muscular impressions distinct, tripartite, the posterior super- 
ficial; callus humeralis distinct, continued almost to the pos- 
terior end; nacre suffused with brown in the center. 
Length 40, alt. 22, diam. 15 mm.” (Kobelt). 
Type locality, Somaliland. 
Unio (Nodularia) erlangeri Konryt, Abh. Senck. Nat. Ges., 
32, 1909, p. 49, pl. vu, fig. 8. 
“Germain, to whom I sent the types for comparison with 
Bourguignat’s types, was unable to refer them to any of the 
described species. He writes: “The Unio is unknown to me. 
It resembles in general appearance some examples of Unio 
plicatulus Lea from the Cape, but is quite distinct by its lines 
of growth. But your shell belongs to the group of Unio 
abadianus Bgt., and is very close to Unio hamyi Bgt. It dif- 
fers principally by being more elevated at the postero-dorsal 
angle. This is the result of the comparison that I have made 
with the types of Bourguignat’.” 
NopULARIA SUBNIGRA Preston. 
“Shell oblong-ovate, covered with a dark brown periostra- 
cum, smooth centrally, but becoming laminiferous towards the 
margins, especially posteriorly; umboes moderately small, 
