ILLUSTRATIONS XXXI 



FIGURE I'AGE 



6ii. The same, from above. From Dall, U. S. N. M 206 



612. A fresh water Mussel {Diplodon wcbsteri) from New Zealand. From 

 DaU, U. S. N. M 208 



613. The other \alve of the same, seen from the outside. Yrom Dall, 



U. S. N. M 208 



614. A fresh water Mussel {Lampsilis salinascnsis) from Mexico. From 

 Dall, U. S. N. M 208 



615. A Scallop {Propcamusium alaskense) from Alaska. From Dall, 



U. S. N. M 208 



616. A clam-like shell {Spisida \_Symmorphomactra~\ planulala) from the 

 Pacific coast. From Dall, U. S.N. M 208 



617. A Heteropod mollusc [Firoloidca). From A. Agassiz 210 



618. A Pteropod {Styliola). From A. Agassiz 210 



619. An oceanic mollusc {Atalaiita}. From A. Agassiz 210 



620. A pelagic mollusc {Janthina) very common on the surface of the Gulf 

 Stream. From A. Agassiz 210 



621. A curious dark blue mollusc (Glaucus) common on the surface of the 

 Gulf Stream. From A. Agassiz 210 



622. A Shipworm {Teredo navalis). P'rom Caiman 210 



623. A young Squid {Loligo). From A. Agassiz 210 



624. The young of the common little brown Periwinkle of the New England 

 coast {Littoriiia). From A. Agassiz 210 



625. The young of the common green Sea-urchin of the New England coast 

 {Strongyloccntrotus drobachiensis). From A. Agassiz 210 



626. The young of the common Star-fish {Astcrias forhesi). From A. Agas- 

 siz 210 



627. The young of a Polyzoan, known as a Cyphonautes. From A. Agas- 

 siz 210 



628. The young of a Balanoglossid, known as a Tornaria. From A. Agassiz 210 



629. The young of one of the annelid or jointed worms (Folygordius). From 



A Agassiz 210 



630. The young of a small Sea-anemone (Edwardsia). From A. Agassiz. ... 210 



631. The fourth stage of the young of a small Jelly-fish {Glossocodon, fig. 495). 

 From A. Agassiz 2 10 



632. The sixth stage of the same. From A. Agassiz 210 



633. The j^oung of Leucodnra. From A. Agassiz 210 



634. The young of Dactyloptis. From A. Agassiz 210 



635. The young of a Nemertean, known as a Pilidium. From A. Agassiz. . . 210 



636. A Rotifer {Euchlanis pcllucida), dorsal view. From Harring 212 



637. The same, lateral view. From Harring 212 



638. Another Rotifer (5 wc/xac/ayo/2a«.?c«j), dorsal view. From Harring. .. . 212 



639. A Rotifer {Encentrum algcnte), lateral view. From Harring 212 



640. A Tapeworm {Mtilticcps miiUiccps) from a dog. From Hall, U. S. N. M. 212 



641. A Tapeworm {Taenia macrocystis) from a wild cat. From Hall, 



U. S. N. M 212 



642. A Tapeworm {Taenia hrachysoma) from the domestic cat. From Hall, 



U. S. N. M 212 



