﻿PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 409 



List of recent additions to shallow-water MoUusca of Southern New 



England.* 



Parasira catemdata Steenstrup. Oceanic. Mediterranean. 



* Truncatula truncatulus (Drap.). Littoral. European. 



Littorina littorea. Littoral 5 abundant. European. 



*Assiminea Grayana Leach. Littoral. European. 



Ancula cristata Loven. Northern and European. 



** Polycerella Emertoni Yerrill. Littoral. 



Scylkva Edicardsii Yerrill. Littoral. Southern and oceanic. 



Coryphella Mananensis (Stimp.) Yerrill. Off Eace Point, Long Island 

 Sound, 40 fathoms. 



Stiliger fuscata, (Gld.) Bergh. Massachusetts Bay. 



Terebratidina septentrionalis (Couth.). Off Block Island, 15 fathoms. 

 Northern. 



DESCRIPTION OF A NEIT SPECIES OF XEMICHTHYS (IVEMICHTHYS 

 AVOCETTA), EKOITI PUGET SOUIVU. 



By OATID S. JORDAI^I and CHARLES H. 01I.BERT. 



Nemichthys avocetta, sp. nov. 



• Color translucent white, the lower half of the body covered with 

 small, round, black spots, sharply defined 5 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 smaU, 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, sharx), 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-Hke 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 have heen 

 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. 



