F. Chapman — Ostracoda from Austria. 325 



as subserial valleys, now submerged. (See papers in Proceedings 

 Scientific Association, 1877, p. 103, and Agricultural Record, 1891, 

 p. 79.) The first Boca (Boca de Monos) is barely balf a mile wide, 

 the second (Boca Huevos) a little wider. The third (Boca Navios, 

 so called, I suppose, because ships do not use it), about the same. 

 The Grand Boca is about six miles wide. These widths may be 

 taken to be the clear widths in the narrowest parts. The rapid 

 currents through these channels have kept them scoured out, and 

 the depth reaches 120 fathoms. No mud or sand of any kind is 

 deposited in these Bocas. The bottom is one of rocky inequalities 

 whose existence is evidenced in the 'violent eddies and ripples of the 

 so-called ' remu,' a phenomenon which occurs when the water 

 outside the Bocas is at its lowest and consequently the water surface 

 gradient from the middle parts of the Gulf the greatest. Outside 

 the Gulf the Caribeau Sea varies in depth from 20 to 60 fathoms 

 except in the line of the great downthrow passing along the axis 

 of the Grand Boca. Here the depth attains 120 fathoms, and is 

 probably not less than 90 in an}'- part. This line of depression 

 seems to be a terrestrial feature of some magnitude. Its extension 

 north-eastward from the Boca Grande, between the islands of 

 Grenada and Tobago, is indicated by deep water marking the 

 boundary between the volcanic region of the Antilles and the 

 non-volcanic region to the south and east thereof." 



It is strange now to myself that in writing my paper on the 

 Microzoic Deposits of Trinidad I should have given so little weight 

 to the bearing the existence of this depression must have on any 

 theory of the movements of the earth's crust in this region. I am 

 unable now to go further into this subject, but I cannot forbear 

 pointing out that this great depression of a portion of the earth's 

 surface, which evidence clearly shows to have been formerly a con- 

 tinuous land surface, had most probably an intimate connection with, 

 or rather was part of, those movements, which among other events 

 broke up and elevated the Naparima Rocks and tilted them on edge. 



IX. — Two New Species of Ostracoda of Tithonian Age fkom 



Nesselsdorf, Austria. 



By Frederick Chapman, A.L.S., F.R.M.S. 



^PHE following descriptions of Ostracoda from the Tithonian of 



L Austria relate to specimens kindly forwarded to me by Dr. M. 



Remes. They were obtained, together with numerous other fossils, 



including Foraminifera, from the Red Limestone of Nesselsdorf. 



The Ostracoda seem to be very rare in these beds, for the two 

 specimens now described were the only forms obtained by Dr. Remes, 

 whilst other microzoa were fairly numerous. 



Bythocypris, G. S. Brady [1880]. 



BytJiocijpris (?) Jurassica, sp. nov. (Figs, la-c.) 



Carapace somewhat compressed ; from the side subreniform, the 



greatest height a little in front of the middle, anterior extremity 



broad and rounded, posterior rounded but narrower. Edge view, 



