Pt 
Zab.—Mud from oysters, St. Mary’s river, Ga. Tidal mud from Savannah 
| Marsh at Fernandina, Florida. Rare. 
Navicula Powelii, n. sp.—V. Linear, sharply attenuated at subacute 
remiti eS, striated ; strie costate, interrupted about their middle by a blank 
1 nning from end to end of the valve; central nodule surrounded by a 
lozenge-shaped blank ae reaching to the blank line as above. Length 
ve 0044-006. PI. Il. f. 4.2 
S species is allied to Navicula lineata Donkin, Mic. Jour., in striation, 
it not in general characters. 
Hat .—Black Rock Harbor, on alge andon mud. Rare. 
1. Mastogloia angulata, n.sp.—F. V. Oblong, truncate. V. Elliptical 
- extremities slightly produced ; loculi from 8 to 12; strie 36 a 40 in -001, re- 
a those of Pleurosigma angulatum. Length of valve -0014 a -0035. 
~ > This Species cannot be confounded with Mastogloia apiculata, from which 
it differs i in its more broadly elliptical shape, the smaller number of its loculi 
am the angular character of its striation. These specific characters are un- 
ryi ng. 
_ Hab.—On alge, from rocks off New Rochelle, Bannister’s creek. Rockaway 
; - 4. idal mud. Stonington Inlet, on harbor grass, along with M. apiculata and 
M. lanceolata. Salt marshes at Atlantic, N. Jersey. Salt marshes at Cape 
ay. Common. 
= ae . Mastogloia exigua, n. sp.—V. Lanceolate elliptic ; extremities some- 
tmes a little produced ; loculi 2 to 5, (commonly trilocular, ) arched on the 
central aspect ; striz obscure. Length of frustule 0005 @ -001. PI. II. f. 5. 
Hab.—Marsh scum of St. Sebastian river, St. Augustine, Florida. Pier at 
Bt: Augustine. Fernandina pier, coast of New Jersey. 
This species occurs quite abundantly at the above localities. Its distinguish- 
_ing peculiarity is the small number and curved outline of the loculi. 
pais She 
ied j Il. Rare and hitherto, in this country, unnoted species. 
1. Cocconeis oceanica Ehr.—V. Broadly elliptical, somewhat larger than 
___ the variety figured in ‘‘ Bacillarien.”’ 
Hab.—Tidal rocks off New Rochelle, L. I. New London and Bridgeport, 
attached to alge and sertularia. Common. 
= 
Bi 2. Epithemia constricta W. Smith.—Hab. Mud from St. Sebastian river, 
Bt. Augustine, Florida. Common. L. I. Sound. 
_ 3. Eupodiscus Ralfsii W. Smith.—Hab. Mud from Black Rock Harbor. 
- Bush river, Del., Mr. Febiger. Rice field mud, Savannah. St. Mary’s river, 
_ Ga. Common, but not abundant. 
d 8 4. Actinophenia splendens Shadbolt.—Hab. Delaware river mud. St. 
_ Mary’s marsh, Ga. Rare. 
_ §. Arachnoidiscus Ehrenbergii Bailey.—Hab. Long Beach, San Fran- 
cisco, Cal., on alge, along with Hyalodiscus Californicus. Rare. 
6. Triceratium undulatum W. Smith.—Hab. Delaware river mud. st. 
_ -Mary’s river, Ga., marsh. Rare. 
7. Triceratium striolatum Ehr.—Hab. St. Mary’s river, Ga. Rice field 
jan Savannah. 
 §. Triceratium pentacrinus Wallich.—Hab, Rice field mud, Savannah. 
_Dredgings off Florida. U.S. Coast Survey. St. Mary’s river. Rare. The 
4 and 5-sided varieties are the only ones I have met with. 
i _ Campylodiscus costatus Ehr. —Hab. Delaware river mud. Rare. 
