PLATE C. 



Figures magnified 500 diameters. 



Fin-. 1. TRK-ERATITTM TABELLAKIUM, Brightw.,var. deplosticta, Grun.; 



camp. Bay. Schm. At., 77, f. 1. 

 " VENULOSUM, Grev.; Gulf of Mexico. Schm. 



' At., 77, f. 8. 

 " 3. BULLOSU.M, Witt. ; (.'amp. Bay; Schm. At., 78, 



f. 33. 

 Figs. 1, i"i. VKxn.osuii, Grev.; Camp. Bay. Schm. At., 77, 



f. 9, 7. 

 Fiy;. "-. TRIPARTITI T M. Grun.; Camp. Bay. V. H., 110. 



f. 8. (Biddulphia.) 

 (i. " HETEROPORUM, Grun.; St. Monica. (Biddul- 



]>liia:, V. II., 112, f. 2. 



" s. IXTERITIVCTATUM, Gruu. ; Nottingham, Md. 



Schm. At., 76, f. 7. A very variable species 

 often apparently closely related to T. elegans, 

 Grev. 

 Fi.irs. 1), Id. TRISULCUM, Baifey; Camp. Bay. Schm. At., 



78, f. 5-8, 112, f. 11-18. 

 11,12. PARALLELUM, Grev.; Monterey. Schm. At. ,75, 



f. 11, 12. 



" 13, 14. HARRISONIANUM, Nor. and Grev.; Camp. Bay. 



Schm. At,. 75, f. 14-16; T. M. S., 1861, p. 76, 

 II, f. 9. 

 Kiu. 15. PARALLELUM, forma trigona, Grev.; Schm. At., 



76, f. 14. 

 Fiirs. Hi. is. ALTERNANS, Ehrb.; Schm. At,, 78, t. 10, 12, (9-20). 



Camp. Bay, etc. 



Fig. 17. SKCERNENDUM, A. S., Schm. At., 76, f. 8. Not- 



tingham, Md. 



