A. E. Verrill—Marine Fauna of North America. 309 
mit of the action of close cropping; and this leaves the only 
alternative that the animal browsed from the tall reeds and 
undergrowth whisk ccompanied a oak and tropical climate. 
These conjectures, if established by more extended research, 
Explanation a plate-—Fig. 1, left lower ramus of Z. cornutus. Fig. 2, molar 
series of same. Fig. 3, median incisor. ig. second incisor. Fig. 5, lateral 
incisor. Fig. 6, canine. e ramus is drawn one-third natural size; the remain- 
ing figures are two-thirds natural size. 
Art. XXXIX.—Notice of recent Additions to the lo Se 
of the eastern coast of North America, No.4; by A. E. VERRILL. 
vag  epasiae to Zoology from the Museum of Yale atin 
extensive collections of marine Invertebrata, belonging to the 
ommission of Fish and Fisheries, which have been 
entrusted to me for examination and description, by the Com- 
missioner, Professor S. F. Baird. In the present notice, there 
are also included certain species which were collected during 
Several special dredging expeditions, sere by the author, 
with Professor S. L Smith and others, in 1864, 1865, 1868, 
1870, previous to the organization of the Fish Commission. 
HyYDROIDA. 
areata Pourtalesii, sp. nov. 
A large species, forming a tall, unbranched, secund plume. 
Hydrocaulus stout, compound, ro rough; the component tubes run 
0 an irregular subspiral course, and each bears two rows of 
hematothecee. The pinnae are very numerous, about an inch 
ong, nd arise alternately, in one line, along the front of the 
Stem and curve outward and upwar rothecse about 
on as tase as broad, only slightly enlarged toward the aper- 
ture, which has a smooth even margin; intrathecal septum 
