8 Mr. T. Davidson on the Brachiopoda 
with a single recent species which could be referred to the shell 
under description. 
T. sinuosa is a very common fossil in the Miocene strata of 
the island of Malta, and was found by Dr. Leith Adams in-the 
“Upper Limestone” (No. 1), the “ Sand-bed” (2), and the “ Marl- 
bed” (3), but most abundantly among the Coralline portions of 
the Upper Limestone. The shell is generally gregarious, and is 
met with in regular beds, but attains its greatest size and per- 
fection in bed No. 1. It is very rare in the nodular vein of the 
“‘Calcareous Sandstone” (4), and Dr. Adams has not yet met 
with it in the “ Lower Limestone” (5). 
In Italy 7. sinuosa has been found very abundantly by M. 
Meneghini in the Middle Miocene of Palazzo in Tuscany, and 
its occurrence in beds of a similar age in Piedmont has been 
noticed by M. Michelotti of Turin. In Sicily it has been found 
by M. Sequenza in the Miocene beds of Messina; and I be- 
lieve I have seen specimens from Algeria. 
2. Terebratula minor, Philippi. PI. I. fig. 8. 
T. vitrea, var. minor, Philippi. 
T. minor, Suess, Ueber die Wohnsitze der Brachiopoden (1859), and Dav. 
Ann. & Mag. Nat. Hist. for July 1861. 
Sp. char. Shell small, ovate, nearly straight in front. Valves 
almost equally deep, uniformly and tumidly convex, without fold 
or sinus. Surface smooth, marked only by concentric lines of 
growth. Beak small, incurved and truncated by a small circular 
foramen ; deltidium small, proportions variable. Length 5, 
width 4, depth 3 lines. 
Obs. The correct determination of this small shell is subject 
to some difficulties. It exactly resembles a Sicilian Pliocene 
example of T. minor sent to me by M. Michelotti of Turi, and 
bears the greatest resemblance to Prof. Sequenza’s T. affinis. 
The specific value of Philippi’s Terebratula minor has, however, 
been differently viewed by some naturalists. Prof. Suess con- 
siders 7. minor to be distinct from T. vitrea (it is, according to 
my learned Viennese friend, smaller, with stronger valves and 
blunt margins), and that Philippi has pointed out the differences 
between the two. M. Sequenza, on the contrary, seems to 
consider Philippi’s 7. minor as nothing more than a smaller race 
of 7. vitrea, and assures me that in the last-named shell and in 
T. minor the loop is exactly the same, that is to say, short and 
simple, the two riband-shaped lamellz bemg soon united by a 
transverse lamella bent upwards in the middle. 
The Maltese specimens I have been able to examine have all 
the external shape and character of small examples of 7. vitrea ; 
