98 Proceedings of the Royal Physical Society. 



bone. Between the two processes of the palate bone is the spheno-palatine 

 foramen, completed above by the inferior portion of the sphenoidal spongy 

 bone, e, The superior portion of the sphenoidal spongy bone. 



Fig. 3. Another view taken from the same specimen : a, b, c, The parts of 

 the inferior margin of the vomer for articulation with the palate, maxillary, 

 and intermaxillary bones respectively ; d, inferior aspect of the sphenoidal 

 spongy bone; e, orbital plate of the ethmoid seen in perspective; /, inferior 

 turbinated process of the ethmoid. 



Fig. 4. Illustrates the articulations of the vomer in the rabbit. Above are 

 the vomer and ethmoid forming one bone. Beneath are the bones of the upper 

 jaw of the left side, and a portion of the intermaxillary bone of the right side 

 adhering to it. a, Anterior extremity of the vomer, grooved for the cartila- 

 ginous septum of the nose ; b, the part of the vomer which articulates with c, 

 the extremity of the expanded mesial processes of the intermaxillary bones, 

 forming turbinations in connection with Jacobson's organ. 



VI. On the Discovery of Nullipores (Calcareous plants) and Sponges in 

 the Boulder Clay of Caithness. By Charles W. Peach, Esq., 

 Wick. (Specimens were exhibited.) 



In a paper read to the Society in March 1855, " On the 

 Calcareous Zoophytes of the Boulder Clay of Caithness," I 

 intimated that, at a future time, it was my intention to give 

 you one on the flora of that formation. I have delayed from 

 time to time, that I might search in wide localities, and thus 

 have succeeded in procuring several specimens at Wick, and 

 the burns of Haster and Freswick.* Mr Cleghorn has also 

 found specimens at Wick, and Mr Dick in and around Thurso. 

 Although pretty widely distributed in the country, nowhere is 

 it found in abundance. At times it is quite soft when first 

 taken out of the clay ; it hardens on exposure, and cracks in 

 the drying, and then, should an attempt be made to make a 

 section, it crumbles to pieces. In one taken from the clay on 

 the side of Wick harbour I got a pretty good slice, and have 

 made out under the microscope the cellular structure ; it agrees 

 with that of the Melobesia polymorpha of Harvey, as may be 

 seen by the specimen herewith sent, mounted in Canada bal- 

 sam, and a specimen on stone, also from Wick. In one spe- 

 cimen, I noticed, as well as the spreading base, the papillary 

 eminences peculiar to this species ; and in another the indenta- 

 tions made by saxicavous creatures. When passing Freswick 



* Since this paper wa9 read I got, on the 18th May (Queen's Birth-day) 

 I860), splendid specimens in the Burn of Strath, near Watten. 



