190 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Vessel: Station Occurrence Vessel: Station Occurrence 



Do 178 2 females, 1.10, 1.12 Horizon 32 3 females, 1.02-1.19 



mm. mm. 



Do 31 1 female, 1.14 mm. Satsuma 32 1 female, 1.05 mm. 



Do 63 5 females, 1.00-1.17 ^i i mi • • • ■■,■,■ j.- • , •. 



jj^j^ Remarks : This species is easily distinguished 



Stranger 34 4 females, 1.12-1.19 ^^'^^ the preceding by its short genital segment 



mm. (fig. 7) and very small fifth feet (figs. 7, 8). 



Family AETIDEIDAE 



Euaetideus giesbrechti (Cleve, 1904) 



(Plate 7, figs. 9-27) 



Pacific records: Vervoort, 1957. Also, as Aetideus 

 giesbrechti; Johnson, 1942; Mori, 1942; Honjo, 1952; 

 Anraku, 1954b; 1954c; Chiba, Tsuruta, and Maeda, 

 1955; Motoda and Anraku, 1955; Nagaya et al., 1955; 

 Chiba, 1956; Honjo et al., 1957; Tanaka, 1957a; Ya- 

 mazi, 1958a. As Euaetideus giesbrechti; Heinrich, 

 1957b; 1958a; 1958b. 



Vessel: Station Occurrence 



Hugh M. Smith __ 94 1 female, 1.95 mm. 



Do 144 1 female, 1.95 mm. 



Do 29 1 female, 1.97 mm. 



Do 63 2 females, 1.97 mm. 



Remarks: Vervoort (1957) has recently de- 

 scribed a new species of Euaetideais (E. austra- 

 lis) as well as redescribed and figured the other 

 three species {E. giesbrechti, E. bradyi, E. acu- 

 tus) in this genus. The latter three species 

 were represented in the present collections and 

 as all three of them differ in a few details from 

 Vervoort's descriptions, I have included a brief 

 discussion and several figures of each of them. 

 The chief diff'erences between my specimens of 

 E. giesbrechti and those described by Vervoort 

 are listed below. The numbers in parenthesis 

 are those given by Vervoort. 



1. Second antennae (fig. 15). Four (3) setae 

 on distal segment of exopod. Seven (6) setae 

 on outer lobe and 9 (8) setae on inner lobe of 

 endopod. 



2. First maxillae (figs. 18-20). Second basal 

 segment with 4 (5) setae. Second inner lobe 

 with 3 (2) setae. Three (4) setae on the first 

 segment of the endopod. It should be pointed 

 out that Vervoort stated that the first maxilla 

 of E. giesbrechti is like that of E. australis. 

 The second basal segment of the first maxilla 

 of the latter species is shown to have 4 setae, 

 which agrees, in this respect, with the number 

 on the present specimens. 



The three species found in the present col- 

 lections are distinguished by the shape of the 

 anterior margin of the head (dorsal view) ; the 

 character of the rostrum; and the posterior 

 lateral thoracic margins. In E. giesbrechti the 

 forehead is evenly rounded and the rostral plate 

 is not visible (fig. 9). There are two small 

 knobs between the rostral spines (fig. 14), and 

 the posterior lateral thoracic margins have a 

 characteristic shape (fig. 12). This species is 

 also larger (1.9.5-2.00) than the other two. 



Euaetideus aciiliis (Farran, 1929) 



(Plate 8, figs. 1-2) 



Pacific records: Vervoort, 1957. Also, as Aetideus 

 acutus; Tanaka, 1957a. 



Vessel: Station Occurrence 



Hugh M. Smith __ 94 5 females, 1.65-1.70 



mm. 



Do 132 2 females, 1.65, 1.70 



mm. 



Do 144 3 females, 1.70 mm. 



Do 153 1 female, 1.70 mm. 



Do 178 9 females, 1.5.5-1.65 



mm. 



Do 30 1 female, 1.61 mm. 



Do 31 2 females, 1.55, 1.65 



mm. 



Do 63 1 female, 1.60 mm. 



Stranger 34 1 female, 1.60 mm. 



Remarks : Certain differences were noted in 

 the second antennae and first maxillae of the 

 present specimens and the descriptions and 

 figures of these appendages given by Vervoort. 

 These differences are summarized below: 



1. Second antennae. Same as that described 

 for E. giesbrechti. Vervoort shows 3 setae on 

 the terminal segment of the exopod and 6 setae 

 on the outer lobe and 8 setae on the inner lobe 

 of the endopod. 



