200 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



PLATE LXVI Continued. 



FlG. 119. Creseis (Hyalocylfo) striata Rang, showing animal extended, enlarged. 



120. Corolla calceola Verrill, with extended animal in situ, two thirds natural 



size. This species and C. spectabilia Dall, of the Pacific, belong to the 

 same group. The former was referred to Gleba, Forskal, by Dr. Pel e- 

 neer in his description of the Challenger Pteropods, probably on ac- 

 count of the poor state of his material. But C. spectabilis has precisely 

 such a "shell" as C. calceola, which does not resemble the "shell" o! 

 Gltba, and has been taken with its "shell" in the Santa Barbara Chan- 

 nel, California. The genus Cymbuliopsis Pelseneer, being of later date 

 than Corolla, will therefore fall into the synonymy of the latter name. 



121. Spongiobranchia australis Orbigny. This figure represents the adult form 



of a tropical Pteropod not yet found on our coast, though certain 

 larvse, perhaps of Notobranchcea, have been referred to it. 



122. Clione limacina Phipps. 



Figures 112 and 113 are from Binney's Gould. The remarks applying to the others 

 will be found under Plate LX. 



PLATE LXVII. 



FIG. 63. Argonauta argo Liune", var. americana Dall. Animal removed from the 



shell and somewhat contracted by immersion in alcohol. 

 63 a. The same, front view of shell. 

 63 b. The same, side view of shell. 



The average Argonauta argo of the Mediterranean has from two to three times as 

 many radial folds and carinal nodules as the variety here figured. It is also more 

 compressed and narrow, and the marginal rib on each side of the aperture is less 

 prominent and usually is merged in the margin imperceptibly and does not stand 

 out laterally at all. There are, doubtless, variations in these characters, but on the 

 whole the Autillean and American form seems sufficiently constant for the latter 

 to receive a varietal name. 

 For remarks on the figures, see note under Plate LX. 



PLATE LXVIII. 



FIG. 1. Teredo dilatata Stimpson, interior and exterior views of valves ; pallets. 



2. Teredo norvegica Spongier, enlarged ; interior view of valve ; the two valves 



united ; pallets. 



3. Lyrodus chlorotica Gould ; interior and exterior view of valves, and the two 



pallets. 



4. Spirula Peronii Lamarck; shell. 



5. Kellia suborbicularis Montagu ; natural size; hinge line and umbo magnified. 



6. Montacuta elevata Stimpson. 



7. Turtonia minuta O. Fabricius. 



8. Nucula tennis Montagu ; somewhat enlarged. 



9. Pholas (Barnea) costata Linn6. 

 10. Zirphcea crispata Leach. 



The figures of which this and the remaining plates (LXIX-LXXIV) are composed 

 are from Mr. W. G. Binney's edition of Gould's Invertebrata of Massachusetts, drawn 

 by Prof. E. S. Morse, and borrowed for the purposes of this publication from the 

 Smithsonian Institution. 



