1881.] On a New Mineral found in the Island of Cyprus. 119 



(6.) The posterior part of the oviduct is not formed until the 

 ovarian sac has become developed, and had not been developed in 

 the oldest larva (11 centims.) the authors have succeeded in obtain- 

 ing. 



The Alimentary Canal and its Appendages. 



In this section the authors give a detailed account of the topo- 

 graphical anatomy of the alimentary tract in the adult. They have 

 detected a small pancreas close to the bile-duct, and call special atten- 

 tion to a ventral mesentery passing from the posterior straight section 

 of the intestine to the ventral wall of the body. 



In the embryological part of the section a detailed account is given 

 of the development (1) of the pancreas, which is described as arising 

 as a dorsal diverticulum of the duodenum on a level with the opening 

 of the bile-duct ; (2) of the yolk sac and vitelline duct ; (3) of the spiral 

 valve, which first appears as a hollow fold in the wall of the intestine, 

 taking a slightly spiral course, and eventually becoming converted into 

 a simple spiral ridge. 



The so-called hyoid gill, which the authors expected to find well 

 developed in the larva, is shown not to be found even in the oldest 

 larva the head of which was examined (26 millims.) 



The last section of the paper is devoted to the consideration of the 

 systematic position of Lepidosteus. The Teieostean affinities of 

 Lepidosteus are brought into prominence, but it is shown that 

 Lepidosteus is nevertheless a true Canoid. 



The arguments used in this portion of the paper do not admit of 

 being summarised. 



IV. " On a New Mineral found in the Island of Cyprus." By 

 Paulus F. Reinsch (Erlangen). Communicated by Pro- 

 fessor Stokes, Sec. R.S. Received November 3, 1881. 



In the western part of the Island of Cyprus I detected, during my 

 journey in J une this year, a peculiar mineral, very remarkable not only 

 from its chemical composition but also from the large percentage of 

 extremely well-preserved siliceous shells of microscopic Radiolaria. 

 The locality in this not much known part of Cyprus,* is situated 

 between the village Chynussa and the mountains running in a north- 



* In the fine map of Kiepert (Berlin, 1878) this part of the island, in which the 

 locality lies, is marked as " wooded hill country, unexplored." In all the reports of 

 travellers through Cyprus before and after the British occupation I find no notice 

 of this tract, which must have attracted the attention of passing travellers. 



VOL. XXXIII. K 



