1913.] NATURAL SCIENCES OF PHILADELPHIA. 393 



Figs. 6, 7. — M. veatchii. Cerros I. Newcomb. Two of the cotypes. No, 



10,263. 

 Fig. 8.—M. veatchii, var. 6. Turtle Bay. Hemphill. No. 60,038. 

 Fig. 9. — Micrarionta veatchii, var. 5. Turtle Bay. Hemphill. No. 60,046. 

 Fig. 10. — Micrarionta veatchii, var. leucanthea Dall. Cotype, U. S. Nat. Mus. 



No. 107,627. 

 Fig. 11. — Micrarionta veatchii, vax. 5. Turtle Bay. Hemphill. No. 60,041. 

 Fig. 12. — Micrarionta veatchii, var. 4. Natividad Island. Anthony. 



No. 69,646. 

 Figs. 13, 14:.— Micrarionta veatchii, var. 3. Cerros Island. Hemphill. 



No. 60,036. 

 Figs. 15, 16. — Micrarionta veatchii, var. 2. Cerros Island. Hemphill. 



No. 60,035. 

 Figs. 17-20. — Micrarionta pandorce Forbes. S. Benito Island. Anthony. 



No. 66,092. 

 Figs. 21, 22, 23. — Micrarionta pandorce, Forbes. S. Benito Island. Hemp- 

 hill. No. 10,297. 

 Fig. 24. — Micrarionta areolata crassula, Dall. Cotype Natividad Island, 



Anthony. U. S. Nat. Mus. No. 107,623. 



Plate XVI.— Figs. 25, 2%.— Micrarionta areolata 'Sowb.' Pfr. Magdalena Bay. 



HemphiU. A. N. S. No. 10,298. 

 Fig. 27.— ikf. areolata. White form. No. 10,299. 



Fig. 28. — M. areolata. Specimen received from Sowerby. No. 10,300. 

 Figs. 29, 30, 31.— M. areolata. Magdalena Bay. W. M. Gabb. No. 10,264. 

 Figs. 32, 33.— M. areolata. Santa Maria Bay. Stearns. No. 10,301. 

 Figs. 34, 35.— M. areolata scammoni Fils. Cotypes. Magdalena Bay. Gabb. 



No. 10,302. 

 Fig. 36.— il/. areolata scammoni Pils. Cotype. No. 10,266. 

 Fig. 37, 38. — M. areolata aspersa Pils. Cotvpes. No. 10,265. 

 Figs. 39, 40, 41.— M. areolata arida Pils. Cotypes. No. 76,208. 

 Figs. 42, 43, 45.— M. levis Pfr. Turtle Bay. Nos. 60,045, 60,042. 

 Fig. 44.— M. lems Pfr. Cerros Island. HemphUl. No. 60,037 

 Fig. 46.— ilf. levis globosa Pils. Type. W. M. Gabb. No. 10,304. 

 Fig. 47.— M. levis globosa Pils. No. 10,305. 

 Fig. 48. — Micrarionta levis var. Asuncion Island. R. E. C. Stearns. No. 



10,306. 

 Figs. 49, 50.— Micrarionta levis var. 1. San Geronimo Island. H. N. Lowe. 



No. 109,064. 

 Fig. 51.— Micrarionta levis Pfr. Photographic copy of Pfeiffer's type figure. 

 Fig. 52.— Micrarionta levis var. Photographic copy of Pfeiffer's figure. 



