1892] 



MARYLAND ACADEMY OF SCIENCES. 



213 



ON THE DISTRIBUTION OF CORDYLOPHORA IN THE CHESA- 



I'EAKE ESTUARIES, AND THE CHARACTER 



OF ITS HABITAT. 



By Artiiuu Bibbins. 



C'onfcHts.— Introductory, 213.— The Original Localities: Curtis Creek, Furnace 

 Creek, Cinder Cove, 314.— Patapsco Localities: Fort Covington, Spring- Gardens, 

 Kiver View, (The Buoys), Fair View, Fort Carroll, 219.— Back Kiver, 223— A Magothy 

 Locality: "New Bridge," (Arnold's Fishing Shore), 223.- A Severn Locality: 

 (Hound Bay), Valentine's Creek, 224.— The Patuxent, 224.— Potomac Kiver Locali- 

 ties: (Pope's Creek), Mathias Point, (Split Rock), Clifton Beach, Fort Washington, 

 (Alexandria), 224.— The Rappahannock. 225.— A York River Locality, (The Pamun- 

 key), 225. -The James, 226.— The Chickahoniiny, 22;.— Food, 22?.— References, 228. 



lUmtrations. — Figure 1: Cordylophora lacustris Allm., 213. — Figure 2 : Hand 

 Dredg-e, 221.— Plate II : Furnace Creek, Cinder Cove and Dam, opp. 215. 



FlU. 1. — COKDYLOPHORA LACUS- 

 TRIS Allm.? (after Schultze). 



A, portion of stem. B, branch 

 bearing one (terminal) liydrantli 

 and four gonophores, 1-4, con- 

 taining ova in various stages of 

 development. The ova of the 

 youngest, 4 (gonophore bud), are 

 not yet visible. Those of the 

 oldest gonophore, 1, have been 

 fertilized, and have become con- 

 verted into planulae. D, digestive 

 tract and diverticula of same. 

 M, mouth. S, stomach, (x 15). 



Two years ago Professor W.K.Brooks suggested to me the 

 need of some expe^ments to determine by what means our 

 brackish water hydroid, Cordylophora,* could best be kept 

 in normal condition in laboratory aquaria. f "While occu- 



* Probably lacustris Allm. (2). The best drawings have been made by Schultze 

 (6). The outlines of a portion of one of his figures (6. PI. IV) are reproduced in 

 Fig-. 1 of this paper. 



1 An account of my results will be given in a separate paper in connection with 

 some morphological and physiological notes. 



December 5. 



