PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 409 
List of recent additions to shallow-water Mollusca of Southern New 
England.* 
Parasira catenulata Steenstrup. Oceanic. Mediterranean. 
*Truncatula truncatulus (Drap.). Littoral. European. 
Littorina littorea. Littoral; abundant. European. 
*Assiminea Grayana Leach. Littoral. European. 
Ancula cristata Lovén. Northern and European. 
** Polycerella Emertoni Verrill. Littoral. 
Seyllea Edwardsii Verrill. Littoral. Southern and oceanic. 
Coryphella Mananensis (Stimp.) Verrill. Off Race Point, Long Island 
Sound, 40 fathoms. 
Stiliger fuscata, (Gld.) Bergh. Massachusetts Bay. 
Terebratulina septentrionalis (Couth.). Off Block Island, 15 fathoms. 
Northern. 
DESCRIPTION OF A NEW SPECIES OF NEMICHTHYS (NEMICHTHYS 
AVOCETTA), FROM PUGET SOUND. 
By DAVID Ss. JORDAN and CHARLES H. GILBERT. 
Nemichthys avocetta, sp. noy. 
Color translucent white, the lower half of the body covered with 
small, round, black spots, sharply defined; among these some smaller 
spots. Belly near the median line black. Upper half of body plain, 
colorless. Pectorals and dorsal plain. Anal speckled. 
Body band-shaped, but not strongly compressed; deepest in the 
middle, tapering behind to the long and very slender filament-like tail, 
and anteriorly to a very long and slender neck, which contracts imme- 
diately behind the head. Skin smooth. No lateral line. 
Head proper small, short and rather broad; concave between the 
eyes, with two median ridges; full and broad behind the eyes, with 
three longitudinal ridges. “Lower part of head narrow, sharp, so that 
the head -would be triangular in a-vertical section. Eye very large, 
vertically placed, its length one-third that of the head without snout. 
Nostrils each simple (two on each side), rather large, close in front of 
eye, without tube or flap. Maxillary extending to close behind the eye, 
the mandible somewhat farther. Jaws prolonged, becoming very slen- 
der, long, acuminate, needle-like at-tip, somewhat recurved. Upper jaw 
the longer, and nearly four times the length-of the rest of the head, 
‘being 7-8 times its greatest depth. Both jaws with small, very numer- 
* Some of the species here included were discovered in 1875 and 1876, and;haye been 
recorded in the American Journal of Science. Those with an asterisk prefixed were 
first discovered on our coast this season, or else have not been previously recorded. 
For additional species, not included in my Report on Invertebrates of Vineyard Sound, 
&c., 1873, see American Journal of Science, x, pp. 40, 41, July, 1876. 
