[15] FAUNA OF OUTER BANKvS, VINEYARD SOUND, ETC. 655 



Several shells were added to our lists, some ot them of special inter- 

 est. Among these is a fine new species of Trophon* from 70 fathoms, 

 and four species of Chitonidse, of which one from 640 fathoms represents 

 an Australian genus, FlacophoraJ not before known in the Atlantic. 

 The other three are Hanleyia mendimria, ^11 fathoms; LeptocMton al- 

 veolus, in 291 and 610 fathoms ; and what api^ears to be the true Trachy- 

 dermon exaratus (G. O. Sars), in 194 fathoms. Choristes elegans was 

 again found in old skates' eggs, in 640 fathoms, and in the same situa- 

 tion we found GoccuUna Beanii and Addisonia paradoxa Dall. The lat- 

 ter was taken several times in 89 to 640 fathoms. A fine living speci- 

 men of Dolium Bairdii was taken in 102 fathoms. Two living speci- 

 mens of My tilimeriajlexuosa | occurred in 349 fathoms, associated with 

 Pecchiolia gemma V., also living; a fresh valve of Pholadomya arata, in 

 108 fathoms ; Axi)iopsis orbiculata G. O. Sars, in 202 fathoms; Modiolaria 

 polita V. & S., in 321 fathoms. In trawl-wings, station 1141, 389 fath- 

 oms, we took four examples of Clione papilionacea Pallas, associated with 

 a living specimen of Gavolina longirostris. 



The southern species of Pteropods were comparatively scarce this 



* Trophon Lintoni Verrill & Smith. — Shell stout, rough, with sis very convex, some- 

 what shouldered whorls, crossed by about nine very prominent, thick, obtuse ribs; 

 whole surface covered with strong, elevated, obtuse, scaly, revolving ciuguli, usually 

 alternately larger and smaller, separated by narrow, deep grooves; they are crossed 

 by arched 8«ales or lines of growth. Aperture broad; canal short, narrow, a little 

 curved; umbilical pit distinct, but small. Length, 28™i» ; breadth, 17™™; length of 

 canal and body-whorl, 19™™; length of aperture, 1.5.5™™; its breadth, 7.5™™. Station 

 1118. Named in honor of Prof. E. Linton, of our party. 



t Placojjhora (Euplacophora) Atlantica V. & Smith. — Broad ovate, with the marginal 

 membrane very broadly expanded in front, and covered with tine spinules above and 

 below, distinctly radially grooved beneath, and with intermediate rows of small ver- 

 rucsB. Edge of mantle, in front of head, digitately divided into about seven lobes, 

 the anterior ones slender, acute. Gills about 16 on each side, occupying more than 

 two-thirds the length of the foot. Shell, broad-ovate, with short, broad anterior 

 valves, the posterior one very small, lunate, and a little emarginate at the posterior 

 edge ; anterior one very broadly rounded, short hind edge with a slight rounded median 

 notch, surface uniformly granulous and faintly radially grooved; inserted edge nar- 

 row, with about 30 irregular denticles ; middle valves have a slight median beak at 

 the hind edge, their lateral areas are strongly marked, crossed with diagonal rows of 

 low rounded granules, separated by narrow radial grooves ; central areas with smaller 

 and less distinct granules, and transverse lines of growth. Color, rusty brown. The 

 largest example is, in alcohol, 32™™ long; breadth, 26™™; length of shell, 21™™; 

 breadth of shell, 18™™; length of anterior valve, 4™™; breadth, 15.5™™. 



I am indebted to Mr. W. H. Dall for the generic determination of this species. 



t The animal of this shell, in alcohol, has a small and short anal tube, surrounded 

 by small papilla}, and a very much larger iucurrent orifice, occupying a ventral posi- 

 tion, and surrounded by numerous long and large tentacle-like papillae; the orifice for 

 the foot is small ; the edge of the mantle is bordered by very small papillae. There 

 is a slender translucent byssus. The hinge ligament is strengthened by a distinct 

 ossicle, placed lengthwise, more or less ovate in form, with the smaller end next the 

 hinge-teeth, and somewhat truncated. 



Pecchiolia gemma also has an ossicle, similarly placed, with the posterior end broader 

 and notched in the middle, the narrower end truncated. 



