130 PROCEEDINGS OF THE ACADEMY OF 



In forming the present collection of marine invertebrates, every 

 part of the harbor was prett^^ thoronghly explored with the dredge, 

 which, however, was not used outside. Nearly everywhere the 

 depth of water proved less than we had been led to expect, and 

 the bottom freer of everything except shelly detritus. Upon the 

 whole, the results of dredging were not in a usual ratio, in 

 interest and importance, with those of collecting by hand on the 

 shoals, &c. I mention this fact, which surprised us at the time, 

 as it goes to show the changeableness of the locality. Probably 

 some of the dredging-grounds worked over by Drs. Stimpson and 

 Gill, in 1860, are not now such. 



The following names occur in Dr. Stimpson's list and not in the 

 present one : — 



Cj'nthia vittata; Molgula sp. ; Ascidia sp.; Plicatula sp.; Lima 

 sp. ; Axinrea sp. ; Area crelata; Pinna carolinensis ; Modiolaria 

 lateralis; Lucina cribraria and two other species; Felania; Lepton 

 lepidum ; Astarte undulata; Trigona sp. ; Yenus rugosa ?; Chione 

 pygmsea ; Lucinopsis n. sp. ; Semele reticulata ; Tellina fausta, 

 versicolor, constricta, T. sp., T. n. sp. ; Strigilla carnaria ; Telli- 

 dora lunulata ; Solen viridis ; Saxicava distorta ; Lyonsia sp. ; 

 Pholadidea cuneiformis ; Tornatella punctostriata ; Dentalium 

 sp. ; ClyiDidella pustula; Scalaria turbinata, multistriata, novang- 

 lia3?; Turbonilla sp. ; Volva uniplicata; Mangelia rubella, fili- 

 formis ; Columbella sp. ; Nassa ambigua ? ; Cerithiopsis ? n. sp. ; 

 Acus concavus. 



Additional ones of the present list are : Pecten sp. (fossil ?) ; 

 Area occidentalis, transversa, limula (fossil ?) ; A. sp. (fossil ?) ; 

 Modiola castanea ? ; Gemma tottenii ; Strigilla sp. ; Cochlodesma 

 leana; Crepldula, var. intorta; Pleurotoma plicata ; Marginella 

 apicina ; Cypraea exanthema ; Nassa? ; Rapana cinerea. 



Some of the undetermined names in the two are presumably 

 the same, and several of those in Dr. Stimpson's list have without 

 doubt been also found by me, but, in consequence of the miscar- 

 riage of a box containing them, were never finally determined. 



Ascidia. 



A species we have not determined is very common on Bird and 

 other shoals 



[July 18, 



