40 



Helga. 



S. R. 332—10 V '06. 51° 12' N., 12° 2' 30* W., 680-735 fms., 

 ooze. Trawl — One, 25 mm. 



S. R. 752—16-17 V '09. 51° 48' N., 12° 11' 30'' W. Soundings 

 523-595 fms., ooze. Hidwater otter trawl, 0-595 fms. 

 Surface temperature 11-9° C. Salinity 35-32°/^^; 

 at 10 fms., temperature 11*51° C. Salinity 

 35*34°/^^ ; at 50 fms., temperature 10*54° C. Salinity 

 35*32°/^^; at 100 fms., temperature 10*45° C. 

 Salinity 35*34%^ ; at 200 fms., temperature 10*18° 

 C. Salinity 35-32 °/^^ ; at 500 fms., temperature 

 8*9° C. Salinity 35*43%^.— One, 22 mm. 



Eryonicus sp. juv. 

 PL IV, figs. 6-9. 



This very interesting specimen was taken by the midwater 

 otter trawl off the south-west coast ; at the same station a 

 small E. Faxoni was taken, and it is possible that the present 

 specimen belongs to the same species. It is a very immature 

 individual, in which only the first two pairs of pereiopods are 

 developed, and these, as wxU as the second and third maxillipedes 

 are furnished with exopodites. It is, in fact, a young Eryonicus 

 in the My sis stage of development, and the first that has been 

 found, so far as I am aware. 



The carapace is very much inflated, and is almost spherical. 

 The rostrum is very long and slender ; on each side of the base 

 there is a small spine, probably representing the spine at the 

 internal angle of the orbit of the adult. The median row^ of 

 spines is well developed, and has the following arrangement : — • 



Rostrum-fl, 2, 1, 1,; 2, 2, 1, 2. 



The lateral margin is not at all clearly defined, and there is 

 hardly a trace of branchial or submarginal carinae. There are 

 four spines in a curved row^ behind the orbit, which is very wide 

 and shallow. A few spines are present on the carapace besides 

 those of the median carina. All the large spines on the carapace 

 have setae springing from them. On the lower antero-lateral 

 edge of the carapace there is a loop through which the tip of 

 the second maxilla is visible. The edge of the loop is finely 

 serrate. 



The abdomen is very small and poorly developed. Each 

 tergum bears a single feeble median spine, and there is a similar 

 one on the basal part of the telson. The pleura are rounded, 

 except in the sixth segment, where they end in a sharp point. 

 A spine projects over the base of the uropods from the postero- 

 lateral angle of the sixth segment. The telson is not fringed 

 with setae. 



