186 DISCOVERY REPORTS 



Family LEPECHINELLIDAE 



Schellenberg, 1926, p. 344. 



Genus Lepechinella, Stebb. 



Stebbing, 1908 {Joitrn. Linn. Soc. Lond., xxx), p. 191. 



Chevreux, 1914 (Bull. Inst, ocean. Monaco, no. 296), p. 1 (Dorbanella). 



Schellenberg, 1925 (Mitt. Zool. Mus. Berlin, xi), p. 205 (Dorbanella). 



Barnard, 1925, p. 355. 



Schellenberg, 1926, p. 344. 



In February 1925 Schellenberg instituted the family Dorbanellidae for this genus, 

 placing it in the neighbourhood of the Atylidae. The priority of Stebbing 's name was 

 independently pointed out in December 1925 (Barnard) and in 1926 Schellenberg 

 changed the family name in conformity. 



The affinity to the Atylidae is shown in the fused 5th and 6th pleon segments. This 

 point escaped Stebbing 's notice; he figures a well-marked suture between the two seg- 

 ments. I have re-examined the Cape specimens and find, both in them as well as in the 

 Antarctic specimen described below, that while the line of junction between the two 

 segments is quite well marked, especially at the sides, the 6th segment is immovably 

 united with the 5th. 



The juxtaposition of this family and the Atylidae thus seems well established. A further 

 likeness is found in the pleated branchiae, which are often found in Nototropis, though 

 in Atylns itself they are simple. The presence of well-developed inner lobes in the lower 

 lip is, however, in conflict with the characters of the Atylidae. 



Three species of this genus are known: chrysotheras, Stebb., from off the Orkney 

 Islands and off the Cape of Good Hope [Schellenberg's Dorbanella sp. (1925) from the 

 Arctic Sea seems to be this species]; echinata, Chevr., from the Bay of Biscay; and 

 drygalskii, Schell., from the ' Gauss' winter station in the Antarctic. A fourth species is 

 described below. 



Lepechinella cetrata, n.sp. (Fig. 114). 



Occurrence: St. 170. South Shetlands. 1 <$ 9 mm. 



Description. Head with two spines on anterior margin (between bases of the 

 antennae), antero-inferior angle produced in a short sharp point. No trace of eyes. 

 Peraeon and pleon carinate. The carinae on the peraeon segments not produced into 

 teeth, though that on segment 7 approximates to the dentate form; on the anterior seg- 

 ments the profile shows merely rounded humps, two on segment 1 and one on each of 

 the following segments. Segment 1 with the antero-inferior corner produced in a short 

 tooth; segment 2 somewhat rounded below. Side-plate 1 slipper-shaped, strongly pro- 

 duced forwards, lower margin serrate, anterior and lower margins setose, side-plate 2 

 oblong, lower margin slightly indented, hind angle with 1-2 serrations and setae; 

 3 oblong, lower margin angularly indented; 4 similar but shorter and not so deeply 

 indented; 5 and 6 with narrow pointed anterior lobes. Pleon segments 1-3 with the 



