. Bulletin of the British Museum (Natural History). GENUS EUAVGAPTILUS (CRUSTACEA, COPEPODA) 4J Euaugaptilus tenuispinus Sars, 1920 Enaugaptilus tenuispinus Sars, 1920 : 16; Sars, 1924 : pi. 97; Sars, 1925 : 290; Sewell, 1932 : 322; Owre & Foyo. 1964a : 343; Vervoort, 1965 : 140; Grice & Hulsemann, 1967 : 19; Owre & Foyo, 1967 : 88, figs 609, 611. Euaugaptilus tenuispinus var.; Sewell, 1947 : 219, fig. 59. Distribution. Recorded in the N. Atlantic, including the Caribbean, between I and 36°N, and in the N. Arabian Sea between 10 and i8°N. Known to occur at a depth of goo m. Euaugap
. Bulletin of the British Museum (Natural History). GENUS EUAVGAPTILUS (CRUSTACEA, COPEPODA) 4J Euaugaptilus tenuispinus Sars, 1920 Enaugaptilus tenuispinus Sars, 1920 : 16; Sars, 1924 : pi. 97; Sars, 1925 : 290; Sewell, 1932 : 322; Owre & Foyo. 1964a : 343; Vervoort, 1965 : 140; Grice & Hulsemann, 1967 : 19; Owre & Foyo, 1967 : 88, figs 609, 611. Euaugaptilus tenuispinus var.; Sewell, 1947 : 219, fig. 59. Distribution. Recorded in the N. Atlantic, including the Caribbean, between I and 36°N, and in the N. Arabian Sea between 10 and i8°N. Known to occur at a depth of goo m. Euaugaptilus truncatus (Sars, 1905) Augaptilus truncatus Sars, 1905 : 14; Farran, 1908 : 16, 75. Euaugaptilus truncatus; Sars, 1924 : pi. 83; Sars, 1925 : 269. Grice & Hulsemann found a female specimen of Euaugaptilus in the South Pacific (33°53'S, 90°34'W in a haul from 2000 to 970 m on 19 January 1966) which they have suggested (in litt.) may represent a new subspecies of E. truncatus. The specimen was slightly smaller (6-6 mm in body length) than recorded by Sars (7-6 mm) and differed from the typical structure in having one seta fewer than normal on the endopodite of the ist swimming limb and two fewer on the first endite of the 1st maxilla (Fig. iic), in having an extra tooth on the gnathobase (Fig. iia), and in the greater reduction of the mandibular palp (Fig. iib). The difference in body length and in setation of the ist maxilla and ist swimming limb can be attributed to possible natural variation; the difference in the mandibular structure may be an abnormality (cf. E. facilis). Until more is known about the occurrence of this form, it seems best to record it as a variant and to refrain from erecting a new subspecies, with the zoogeographical connotations this would Fig. II. An unusual specimen of Euaugaptilus truncatus. A. Mandibular gnathobase. B. Mandibular palp. C. ist maxilla. Distribution. Recorded from the N. Atlantic between 28 and 55°N and as far as
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