NATURAL SCIENCES OP PHILADELPHIA. 159 



longer than those of the two preceding pairs. Telson oblong, narrower and 

 less tapering than in most species of the genus. 



Length 0-45 inch. 



Dredged in ten fathoms, on a muddy bottom, in Hale's Passage, by Lieut. 

 White. 



Ammothea longicaudata. 



Body broad, robust, hispid above. Eye placed on a high papilla, and 

 double, or divided in two longitudinally. Chelate " antennae" much shorter 

 than the proboscis ; their slender lower branch, however, is much longer, 

 nine jointed, not tapering, and with blunt extremity. Proboscis large, very 

 stout, elliptical in outline. Feet rather thick, fourth joint stoutest ; upper 

 surfaces sparsely hispid; basal joints armed with slight dentiform protuber- 

 ances, ovigerous feet of moderate length. Abdomen large, half as long as the 

 body. Diameter nearly three-fourths of an inch. 



"We know the genus Ammothea of Leach only by the short diagnosis of 

 Dana, in the U. S. Exploring Expedition, Crust, ii., p. 1390 (" Nympho affinis. 

 Ramus antennas longior, 9-articulatus,") and may be wrong in referring this 

 .species to it. One specimen occurs in the collection. 



GEPHYREA. 



Phascolosomum exaspeeatum. 



Body brownish, curved in the form of an arc, and thickest near the poste- 

 rior extremity. Surface wrinkled transversely and covered with small black- 

 ish grains, about one- sixtieth of an inch in diameter, rather larger and less 

 crowded posteriorly, and smaller and less numerous on the concave than on 

 the convex side. Proboscis bluish-white, with numerous irregular transverse 

 blackish bands, interrupted on the concave side. The proboscis being par- 

 tially retracted in our single specimen, we are unable to see its extremity dis- 

 tinctly, but it seems to have a series of six or eight crowded rings of minute 

 blackish echinulations next the mouth, as in the allied forms. 



Length 2 inches ; thickness of the body, 0-46; thickness of proboscis, 0-2 

 inch. 



Sternaspis affinis. 



Almost identical with S.fossor Stm., from Massachusetts Bay, but with the 

 body smoother about the middle, where there is no trace of the echinated an- 

 nuli, which may be discerned even on the middle segments in S.fossor. 



Found in muddy bottoms in from ten to twenty fathoms. 



Dredged by Lieut. J. W. White. 



TUNICATA. 

 Cynthia haustoh. 



Body globular, strongly and coarsely corrugated in an irregularly reticu- 

 lating manner, with the interstices deep and the prominent parts covered with 

 coarse sand, strongly agglutinated. Apertures at the extremities of long cy- 

 lindrical tubes, nearly equalling in length the diameter of the body. These 

 tubes are wrinkled transversely, and are from one-third to one-half as thick 

 M they are long. The branchial tube is considerably longer than the anal. 



Diameter about two inches. 



With the next species, this forms masses which are found somewhat abun- 

 dantly on 6helly bottoms in the circumlittoral zone in Puget Sound. 



Cynthia Gibbsii. 



Body elongated, attached at one end, more or less cylindrical, or somewhat 

 oppressed and, when contracted, half as thick as long. Surface free from 

 1864.] 



