iv CONTENTS. 



VIII. List of Birds collected in the Vicinity of Ogden, Utah Territory, 



"from September 1 to October 8, 1871. With Annotations . . 164 

 IX. Summary List of Birds observed in Kansas, Colorado, Wyoming, 



and Utah, in 1871 173 



No. 7. — Interim Report of the Hydroids collected by L. F. de Pourtales, 

 during the^Gulf Stream Exploration of the United States Survey. By 

 George J. Allman 185 



No. 8. — The Echini collected in the Hassler Expedition. By Alexander 

 Agassiz . . . 187 



No. 9. — Catalogue of the Terrestrial Air- breathing Mollusks of North Amer- 

 ica, with Notes on their Geographical Range. By W. G. Binney. (1 Plate) 191 



No. 10. — Ophiuridae and Astrophytidse, new and old. By Theodore 



Lyman. (7 Plates) 221 



On the Species of Ophiothrix from the Waters of Western Europe and 



of the Mediterranean .... 240 



Catalogue of the Ophiuridae and Astrophytidse collected by Prof. C. 

 Semper, and now belonging to the Museum of Comparative Zoology 252 



Homologies of Chewing Apparatus in Ophiuridte 254 



Explanation of Plates 260 



No. 11. — Exploration of Lake Titicaca. By Alexander Agassiz and 

 S. W. Garman. (1 Plate) 274 



I. Fishes and Reptiles. By S. W. Garman 274 



Fishes, 274 ; Batrachians, 276 ; Reptiles, 278. 



No. 12. —Exploration of Lake Titicaca. By Alexander Agassiz and 

 S. W. Garman 279 



II. Notice of the Palaeozoic Fossils. By Orville A. Derby, M. S., 



with Notes by Alexander Agassiz 279 



No. 13. — Recent Corals from Tilibiche, Peru. By Alexander Agassiz 

 and L. F. de Pourtales. (1 Plate) 287 



No. 14. — The Development of Salpa. By Wm. K. Brooks, Ph. D. (34 



cuts) 291 



Embryology of Solitary Salpa (Female) 306 



Development of the Salpa Chain 326 



Summary and General Conclusions ....... 337 



No. 15. — Exploration of Lake Titicaca. By Alexander Agassiz and 

 S. W. Garman 350 



III. List of Mammals and Birds. By J. A. Allen, with Field Notes 



by Mr. Garman. Mammals, 350 ; Birds 353 



No. 16. — Exploration of Lake Titicaca. By Alexander Agassiz and 

 S. W. Garman 361 



IV. Crustacea. By Walter Faxon. (With 37 cuts) ... 361 



