SYSTEMATIC REPORT 133 



in the Discovery collection. In fully grown, sexually mature specimens the peduncles ol the first 

 and second antennae, and the thorn terminating the naked outer margin of the scale, are all the same 

 length and I ascribe the shortness of the antennal peduncle of Nouvel's type to its immaturity. 



Illig (1930, p. 448) stated definitely that in E. oculata the antennal scale is generally shorter than the 

 antennular and antennal peduncles, that it may rarely be equal to them in length, but that it never 

 overreaches them. Other differences between the two species are variable, and I have therefore used 

 the relative length of the scale for the identification of the specimens which I have here referred to 

 E. intermedia. In every case the whole of the apex of the scale extends beyond the distal margins of the 

 subequal antennae and this is the case in juveniles also. The species may be also recognized by the 

 eyes, which are longer and more slender than in E. glyphidophthalmica, with the outer margins nearly 

 straight and the lateral areas of ocelli larger than the terminal ones but not swollen. There is quite 

 a wide region of colourless, imperfectly developed facets between the two areas of ocelli. I have found 

 the width of the posterior margin of the telson too variable to make a good specific guide, but in every 

 case the length of the telson is less than its width at its base. 



The rostrum in E. intermedia is very short and acute though not so sharply pointed as in E. glyphid- 

 ophthalmica, while in E. oculata it is produced into a small, distally rounded projection. 



Distribution. This species was originally recorded from the west of the Canary Isles. Zimmer 

 (191 5 b) recorded an immature specimen of E. glyphidophthalmica from the Gulf of Naples, but he 

 noted that the eyes were more slender and that the two areas of ocelli in the eyes were separated by 

 a wider region of colourless facets than in the type of that species. This description coincides so 

 exactly with E. intermedia that I suggest that he was in fact dealing with this species. If I am correct 

 in my supposition, its geographical range would include the Mediterranean. 



It was taken at fifteen stations by ' Discovery ', ' Discovery II ' and ' William Scoresby ' from off the 

 south and south-west coasts of South Africa in the south to the Cape Verde Islands in the north, and 

 also off Montevideo. It was also taken in the Indian Ocean, south of Madagascar. 



It is interesting to note that twelve of the Discovery hauls were taken at night. It is not a 

 particularly deep-water form, but as in each case it was taken in oblique hauls to the surface, it is not 

 possible to say exactly at which depth the animals were living. Most of the captures were made in 

 nets fishing from less than 500 m. to the surface and the least depth was at station 268, ioo-i5o(-o) m. 

 when the net failed to close. 



Genus Euchaetomeropsis Tattersall, 1909 

 1909 Euchaetomeropsis Tattersall, W. M., p. 130. 



Remarks. This genus agrees with the genus Euchaetomera in all respects, save in the form of the 

 antennal scale. In Euchaetomera the outer margin of the scale is naked and may or may not end in 

 a thorn, but in Euchaetomeropsis it is setose all round. In the only species, at present referred to the 

 genus, the scale is narrowly lanceolate in shape with a narrowly rounded apex. In both genera there 

 is a small distal suture. 



Euchaetomeropsis merolepis (Illig), 1908 



1903 Euchaetomera tenuis (pars) Lo Bianco, p. 191. 



1908 Euchaetomera merolepis Illig, p. 550. 



1909 Euchaetomeropsis merolepis Tattersall, pp. 130-2. 

 1914 Euchaetomeropsis merolepis, Zimmer, p. 395. 



1929 Euchaetomeropsis merolepis, Colosi, p. 417. 



1930 Euchaetomeropsis merolepis, Illig, pp. 450-2, text-figs. 97-103. 



