EXPLANATION OF PLATES. 

 Plate 38. 



Fig. 1. Opisthosiphon (Opisthosiphona) berryi Clapp. 



2. Opisthosiphon (Opisthosiphona) berryi Clapp. 



3. Opisthosiphon (Opisthosiphona) berryi Clapp. 



4. Opisthosiphon (Opisthosiphona) berryi Clapp. 



5. Opisthosiphon (Opisthosiphona) berryi semiapertum, new subspecies. 



6. Opisthosiphon (Opisthosiphona) berryi semiapertum, new subspecies. 



7. Opisthosiphon (Opisthosiphona) berryi semiapertum, new subspecies. 



8. Opisthosiphon (Opisthosiphona) berryi semiapertum, new subspecies, type. 



9. Opisthosiphon (Opisthosiphona) paredonense, new species. 



10. Opisthosiphon (Opisthosiphona) paredonense, new species. 



11. Opisthosiphon (Opisthosiphona) paredonense, new species, type. 



Plate 39. 



Fig. 1. Opisthosiphon (Opisthosiphona) paredonense transitorium, new subspecies, 



2. Opisthosiphon (Opisthosiphona) paredonense transitorium, new subspecies, 



type. 



3. Opisthosiphon (Opisthosiphona) obturatum, new species. 



4. Opisthosiphon (Opisthosiphona) obturatum, new species, type. 



5. Opisthosiphon (Opisthosiphona) obturatum, new species. 



6. Opisthosiphon (Opisthosiphona) obturatum, new species. 



7. Opisthosiphon (Opisthosiphona) obturatum subobturatum, new subspecies, 



type. 



8. Opisthosiphon (Opisthosiphona) obturatum subobturatum, new subspecies. 



9. Opisthosiphon (Opisthosiphona) obturatum subobturatum, new subspecies. 



10. Opisthosiphon (Opisthosiphona) obturatum subobturantum, new subspecies. 



11. Opisthosiphon (Opisthosiphona) obturatum subobturatum, new subspecies. 



Plate 40. 



Fig. 1. Opisthosiphon (Opisthosiphona) apertum, new species. 



2. Opisthosiphon (Opisthosiphona) dalli Torre and Henderson. 



3. Opisthosiphon (Opisthosiphona) apertum, new species, type. 



4. Opisthosiphon (Opisthosiphona) bioscai, new species, type. 



5. Opisthosiphon (Opisthosiphona) salustii, new species. 



6. Opisthosiphon (Opisthosiphona) bioscai, new species. 



7. Opisthosiphon (Opisthosiphona) salustii, new species, type. 



8. Opisthosiphon (Opisthosiphona) dalli Torre and Henderson, type. 



9. Opisthosiphon (Opisthosiphona) dalli Torre and Henderson. 



Plate 41. 



Fig. 1. Opisthosiphon (Opisthosiphona) evanidum, new species, type. 



2. Opisthosiphon (Opisthosiphona) evanidum, new species. 



3. Opisthosiphon (Opisthosiphona) evanidum degeneratum, new subspecies, type. 



4. Opisthosiphon (Opisthosiphona) occultum, new species, type. 



5. Opisthosiphon (Opisthosiphon) protractum, new species. 



6. Opisthosiphon (Opisthosiphona) occultum, new species. 



7. Opisthosiphon (Opisthosiphona) occultum, new species. 



8. Opisthosiphon (Opisthosiphona) evanidum degeneratum, new species. 



9. Opisthosiphon (Opisthosiphon) judasense, new species. 



10. Opisthosiphon (Opisthosiphon) judasense, new species, type. 



11. Opisthosiphon (Opisthosiphon) protractum, new species, type. 



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