242 J. H. ASHWORTH. 



Conn. (VerrilP). The specimens sent to me by the Smith- 

 sonian Institution were taken at four stations off this coast^ 

 the most northerly one being off Nova Scotia, and the most 

 southerly in latitude 40° N. 



Although Scalibregma is found in some places in con- 

 siderable numbei's in shallow water (as in some of the fjords 

 of Nordland (see Danielssen, 1859, p. 25), it is more usually 

 obtained by dredging, and sometimes from considerable 

 depths. Those from the Smithsonian Institution were all 

 obtained at depths varying from 43 to 99"5 fathoms, and 

 the " Challenger" specimens were dredged from 98 and 700 

 fathoms respectively. 



Scalibregma burrows in sand, which is often more or less 

 intermixed with mud or clay, to a depth of one or two feet, 

 forming long passages which in some places, as in the fjords 

 of Nordland, are accessible at low water (Danielssen, p. 25). 

 In its mode of life it evidently strongly resembles the common 

 lugworm (Arenicola marina) of our coasts. 



4. External Characters (13 PL). 



The general aspect of Scalibregma inflatum may be 

 described as arenicoliform, but its shape varies considerably 

 in different individuals. The anterior end of the animal is 

 short, and resembles a truncated cone (fig. 1). The following 

 region of the body is inflated to a greater or less degree, the 

 inflation extending sometimes over only four or five seg- 

 ments, but more generally comprising about ten segments. 

 The swollen portion is either globular or more or less cylin- 

 drical. In many cases, especially in the smaller specimens, 

 the body swells out abruptly about the fifth or sixth segment, 

 decreasing in diameter almost as suddenly at the end of the 

 inflated portion; but in most of the larger specimens there 

 is a much more gradual transition from the inflated portion 

 to the regions in front of and behind it, as shown in fig. 1. 



' "New England Annelida," 'Trans. Acad, of Arts and Sciences,' vol. iv. 

 Part 2. Newliaven, 1882. 



