REPORT ON THE ANNELIDA. 
359 
procured at a depth of 1785 fathoms by the late Dr. Gwyn Jeffreys during the Arctic 
cruise in the “Valorous.”^ 
Family Scalibregmida;. 
The Scalibregmidse seem to be somewhat less common than the foregoing family in 
collections. No species is mentioned by Grube in the “ Gazelle,” and none appear 
amongst the Philippine series of Semper. None was found by .Schmarda, and the same 
may be said of Kinberg. The occurrence of only two in the collection of the Challenger 
is therefore a fair representation of the family. 
As a rule they frequent muddy ground, and some reach considerable depths ; for 
instance, Scalihregma injlatiim, fvom the cold area, at 412 fathoms in the “Norske Nord- 
havs-Expedition.” They are, however, more abundant in the shallower waters. 
Scalihregma, H. Kathke. 
Scalihregma infiatum, H. Rathke, var. (PL XLIV. figs. 3, 4 ; PL XXIIa. fig. 21). 
Hahitat. — Dredged in considerable abundance at Station 141 (between Prince 
Edward Island and Kerguelen), December 17, 1873; lat. 34° 41' S., long. 18° 36' E. ; 
depth, 98 fathoms ; bottom temperature 49°'5, surface temperature 65°'5 ; sea-bottom, 
green sand.. ' 
Apparently the same form was trawled at Station 169 (off the north-west corner of 
New Zealand), July 10, 1874; lat. 37° 34' S., long. 179° 22' E. ; depth, 700 fathoms; 
bottom temperature 40°'0, surface temperature 58°'2 ; sea-bottom, blue mud. 
The specimens are all much smaller than the European Scalihregma injiatum, the 
longest measuring about 18 mm., with a breadth at the anterior thickened region of 
nearly 4 mm. 
When compared with the European form of similar size, the foreign species has a 
more fusiform outline and much less of the inflation anteriorly. The branchiae are 
similar, but in the Norwegian examples these are longer. In both the latter and the 
British specimens a prominent and continuous fold occurs behind the head (separated by 
a sulcus) ; but in the Challenger form the head has a greater antero-posterior diameter, 
and posteriorly there are two elevated surfaces or papillae (PL XLIV. fig. 3). The only 
difference in regard to the tail is the apparent increase in the length of the cirri towards 
the tip, but in this respect so much depends on the state of the preparations that little 
reliance can be placed on it. The tessellated dorsal regions of the respective forms are 
very similar. 
1 Trans. Linn. Soc. Land. (ZooL), ser. 2, vol. i. p. 506, pi. Ixv. figs. 15, 16. 
