206 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



second pair of feet have exopods composed of 

 3 segments and endopods of 2 segments while 

 the succeeding 2 pairs of feet each have 3-seg- 

 mented exopods and endopods (figs. 19-21). 

 The terminal spine of the second, third, and 

 fourth pair of feet is characterized by an outer 

 serrate margin and an inner row of small per- 

 forations. The endopods of the second and 

 third feet have large spines arising from their 

 surfaces. Numerous smaller spines are pres- 

 ent on the 2 distal exopodal segments of the 

 second and third feet. The fourth feet have 

 a reduced number of spines. 



The fifth feet (fig. 22) are small and consist 

 of 2 segments. There is a stout and finely 

 toothed spine arising from the distal segment. 



Remarks: This species is closely related to 

 A. vorax (Esterly, 1911). It differs from Es- 

 terly's species in the segmentation of the cepha- 

 lothorax, cephalothorax-abdomen ratio, and the 

 structure of the fifth feet. The fourth and 

 fifth thoracic segments are separate in A. vorax 

 but fused in A. smithae. Davis (1949) also 

 reported that these segments in his specimen of 

 A. vorax were fused. The cephalothorax is 6% 



times longer than the abdomen in A. vorax 

 according to Esterly; in the present species it 

 is approximately 4 times the length of the ab- 

 domen. Davis stated that the abdomen of his 

 specimen was longer than that reported by 

 Esterly. In A. vorax there are two spines on 

 the distal segment of the fifth feet. In A. 

 smithae there is one robust spine. 



Vervoort (1957) has discussed the genus 

 Amallophora and pointed out difi:erences be- 

 tween it and the genus Xanthocalanus. The 

 structures of the maxillae and fifth feet appear 

 to exclude the present species from the genus 

 Xanthocalamis although the articulated rostral 

 filaments are unlike those found in Amallo- 

 phora. If Brodsky (19.50) is correct in assign- 

 ing Esterly's species (described as Scolecithrix 

 vorax) to the genus Amallothrix then perhaps 

 the present species should also be placed in this 

 genus. Until the Xanthocalanus-Amallothrix- 

 AmaUophora complex is revised, I am referring 

 the present species to the genus Amallophora. 



The species is named for the research vessel 

 Hugh M. Smith. The holotype is deposited in 

 the U.S. National Museum (No. 104, 422). 



Family SCOLECITHRICIDAE 



Scolecithrix danae (Lubbock, 1856) 



Pacific records: Esterly, 1905; Scott, 1909; Farran, 

 1929; Yamada, 1933; Farran, 1936; Mori, 1937; Dakin 

 and Colefax, 1940; Johnson, 1942; Mori, 1942; Wilson, 

 1942; 1950; Anraku, 1952; Honjo, 1952; Nakai, 1952 

 Tanaka, 1953; Anraku, 1954b; Johnson, 1954; Tsuruta 

 and Chiba, 1954b; Chiba, Tsuruta, and Maeda, 1955 

 Hida and King, 1955; Motoda and Anraku, 1955; Na 

 gaya et al., 1955; Chiba, 1956; Honjo et aL, 1957 

 Heinrich, 1958a; Yamazi, 1958a. 



Vessel : 



Hugh M. Smith __ 132 



Do 



Do 



Do 



Do 



Do 



Do _ 

 Da _ 



Stranger 



Vessel: Station Occurrence 



Orsom 10 2 females, 2.01, 2.11; 



1 male, 1.97 mm. 

 Horizon 32 3 females, 2.04; 2 



males, 2.04, 2.11 



mm. 

 Satsuma 32 2 females, 1.90, 2.00 



mm. 



Remarks : The posteriorly directed ventral 

 protrusion on the female genital segment and 

 the structure of the fifth feet of the male serve 

 to identify this species. Figures of both these 

 characters are given in Rose, 1933. 



Scolecithrix braiiyi Giesbrecht, 1888 



(Plate 16, figs. 1-5) 



Pacific records: Esterly, 1905; Farran, 1929; 1936. 

 As Scolecithricella hradyi; Scott, 1909; Mori, 1937; 

 1942; Wilson, 1942; 1950; Honjo, 1952; Tanaka, 1953; 

 Chiba, Tsuruta, and Maeda, 1955 ; Motoda and An- 

 raku, 1955; Nagaya et al., 1955; Chiba, 1956; Honjo 

 et al., 1957. 



