129 Dr. T. Scott on new and rare 



(PL III. fig. 19). In the female dissected the ova were nume- 

 rous and small. The shell in both sexes ornamented with 

 faint delicate reticulations. The groups of glands situated 

 near the postero-dorsal angles of each of the two valves, as 

 indicated in the drawing (PL IV. fig. 2), are quite distinct. 



Hah. ' Goldseeker ' Station 53, lat. 59° 36' N., long. 7° W., 

 1140 metres deep, collected in August 1907. Two adult 

 males and one female, and other two smaller specimens 

 which appear to be young males. 



Remarks. — The occurrence o£ this Euconchoecia at Station 53 

 appears to be of interest, as it differs so much in size and in 

 other respects from E. chierchice, G. W. Miiller, the only 

 other species of the genus. E. chierchice was described from 

 specimens collected by Dr. Chierchia off the Brazilian 

 coast in lat. 19° S. and long. 39° W. ; these specimens 

 measured about 1*2 mm. in length *. The same species 

 was described and figured in the Report on collections 

 made by John Rattray in the Gulf of Guinea, under the 

 name of Ilalocypris aculeata ; the size of the specimens 

 from these collections was about 1 mra.f It has also been 

 recorded from Cruz Bay by Dr. G. S. Brady, who gives the 

 size of the male as 1*1 mm. and of the female as 'S5 mm. J 

 The ' Goldseeker ' specimens are thus about four times the 

 size of E. chierchiai. Moreover, in both the adult males the 

 rostral projection of both valves of the shell is distinctly 

 bifid, as shown in the drawing (PL IV. fig. 2), but in the 

 shell of the adult female the rostral projection is not bifid. 

 One other point of interest is the large brush of delicate 

 filaments at the apex of the antennules in both the male and 

 female. The brush at the apex of the antennules in E, chi- 

 erchice is described by Dr. Brady as consisting " of about 

 twenty setee." In the 'Goldseeker' specimens the brush 

 consists of several times twenty setae. I have not counted 

 the number of setae, for they are so numerous, so delicate, 

 and so crowded together, that the counting of them would be 

 a somewhat serious task — in a small fragment broken off 

 from one of the brushes at least forty setae were counted. 



Owing to the differences mentioned I am inclined to ascribe 

 the ' Goldseeker ' specimens to a distinct species, for which I 

 propose the name of Euconchnecia d'arcy-thompsoni, after 

 Prof. d'Arcy W. Thompson, C.B., Director of the Scottish 

 International Investigations. 



* " Ueber Halocypriden," Zoologisch. Jahrb. Bd. v. p. 277, pi. xxviii. 

 figs. 1-10 (1890). 



t Trans. Linn. Soc. vol. yi. p. 142, figs. 5, 6, 33, 34, 38 (1894). 

 X Trans. Zool. Soc. vol. xvi. p. 190, pi. xxii. figs. 9-15 (1902). 



