OLENELLUS AND OTHER GENERA OF MESONACID.E 4I3 



OlcncUus lapzvorthi Peach (continued) : page 



6. Cephalon 1.2 mm. in length. X I5- Specimen in Royal Scot- 



tish Museum, Edinburgh, Scotland. Catalogue No. M515/. 

 Cast in U. S. National Museum, Catalogue No. 56830^. 



7. Hypostoma associated with this species. X 3- Specimen in 



Royal Scottish Museum, Edinburgh, Scotland, Catalogue No. 

 M494/'. Cast in U. S. National Museum, Catalogue No. 56830/". 

 The specimens represented by figures 1-7 are all from shales 

 on the northern slope of Meal a' Ghubhais, 1,200 to 1,300 feet 

 above Loch Maree, Ross-shire, Scotland. 



OlcncUus reticnlatus Peach 335 



Fig. 8. Small, broken cephalon. X 8. Specimen in Royal Scottish 

 Museum, Eidinburgh, Scotland, Catalogue No. Msiof. Cast 

 in U. S. National Museum, Catalogue No. 568340. 



9. Portion of cephalon. Natural size. Specimen in Royal Scot- 

 tish Museum, Edinburgh, Scotland, Catalogue No. M4076C/. 

 Cast in U. S. National Museum, Catalogue No. 56834^. 



Figure 9 is redrawn from the specimen illustrated by Peach, 

 1894, pi. 30, fig. I. 



10. Photographic enlargement (X i-5) of a portion of the cephalon 



figured by Peach, 1894, pi. 30, fig. 2. Specimen in Royal Scot- 

 tish Museum, Edinburgh, Scotland, Catalogue No. M4i04(y. 

 Cast in U. S. National Museum, Catalogue No. 56834c. 



The specimen is compressed laterally so as to force the eye 

 lobes in toward the glabella. 



11. Portion of the surface of the specimen represented in fig. 10. 



X3. 



12. Cephalon with short palpebral lobe and strong outer border. 



X 2. Specimen in Royal Scottish Museum, Edinburgh, Scot- 

 land, Catalogue No. M4i4i(;/. Cast in U. S. National Museum, 

 Catalogue No. 56834^/. 



13. Portions of cephalon and thorax. X 2. Specimen in Royal 



Scottish Museum, Edinburgh, Scotland. Cast in U. S. Na- 

 tional Museum, Catalogue No. 56834^. 



The specimens represented by figures 8-13 are all from shales 

 on the northern slope of Meal a' Ghubhais, 1,200 to 1,300 feet 

 above Loch Maree, Ross-shire, Scotland. 



OlcncUus?, sp. undt 342 



Fig. 14. A minute cephalon from the same locality as that given for 

 OlcncUus lapzvort'ii and O. rcticulattis. X 10. Specimen in 

 Royal Scottish Museum, Edinburgh, Scotland, Catalogue No. 

 M4i57af. Cast in U. S. National Museum, Catalogue No. 

 56838a. 



