[35] ANNELIDS OF PEOVINCETOWN, MASS. 733 



The branchiaB are divided from near the base, flattened, ending in 

 short blunt subdivisions (fig. 73). The anterior branchias are much 

 larger than the posterior. 



The uncigerous tori on the segments bearing capillary setre are 

 large, projecting, convex externally; then follow eight segments, on 

 which the tori are much smaller, and square ; then three segments, 

 apparently without setae ; then a short anal segment, with crenulated 

 margin. 



No lines of segmentation can be made out in living specimens on the 

 dorsum and sides as far back as the last segment with capillary setae ; 

 on alcoholic specimens they are faintly perceptible. 



The cirri of the third and fourth setigerous segments of the male 

 form are small, flattened, quadrangular. 



The uncinate setae have one very large tooth at the apex (fig. 74). 



Thebodytapers very gradually, thediameterof the last segment being 

 about one-half that of the anterior segments. 



The general color is green ; anterior two-thirds with numerous irreg- 

 ular black specks on the dorsum and sides; these become larger and 

 confluent on the posterior segments, forming spots or blotches. First 

 segment crossed by a band of dark reddish-brown specks (? eye specks), 

 closely crowded ; tentacles light flesh-color ; branchiae with dark-brown 

 center. 



A single specimen, a male, wa« taken in sand, at low water. 



Length, 9'"'^. 



Greatest width, 1™™. 



PISTA Malmgren. 



In the Invertebrate Animals of Vineyard Sound, etc., Professor Ver- 

 rill has described a new genus, Scio7iopsis, which he says is closely 

 related to Pista, differing from that genus in the extent of the mem- 

 brane on the third segment, and in the structure of the branchiae. We 

 found at Wellfleet a form which seems to be intermediate between 

 Pista and Scionopsis. In the form of the uncinate setae and in the 

 lateral membrane on the second and third segments it agrees with 

 Pista ; until closely examined the branchiae seem also to agree with 

 Pista, siuce, owing to the arrangement on the stem, they present the 

 same lieculiar form. However, in the method of branching they agree 

 with Scionopsis. It seems best, for the present at least, to refer both 

 this new form and Scionopsis Vebeill to Pista. 



Pista inteemkdia n. sp. 



(Pl. VI, Figs. 75-78.) 



The brauchiiB in this species arise from an elongated central stalk, 

 the basal portion of which is naked (without branches) for a variable 

 length, depending upon the size of the branchiae. The branches are 

 given off from the stem very close to each other, and ai^pear to be ar- 



